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|Kai||Kai (Shadow of Ronin)||Kai (The LEGO Ninjago Movie)|
|“Confidence. You know the feeling you can do anything if you put your mind to it. There was a time I didn't think I could be a Ninja. But you pushed me to be better, now I'm pushing you.”|
|— Kai to Wu|
Kai (occasionally referred to as the Fire Maker by the Ice Fishers) is currently the Elemental Master and Ninja of Fire, as well as Nya's older brother. He and his younger sister worked as blacksmiths in their father's blacksmith shop all their life until they met Master Wu. With his guidance, Kai learned Spinjitzu and discovered his other teammates, with whom he embarked on many adventures; battling the likes of the Serpentine and the Stone Army. He and Cole were the original leaders of the Ninja team before Lloyd became the new leader of the team. They would often alternate and share the leadership
After Zane's sacrifice to destroy the Golden Master, the Ninja parted ways before reuniting to go rescue Zane on Chen's Island. There, Kai grew closer to Skylor, one of the tournament contenders, as they competed in the Tournament of Elements. Ultimately, he allied with the other Elemental Masters to defeat Chen's army. After the war ended, Lloyd was possessed by Morro, who escaped the Cursed Realm and released a legion of ghosts. Kai and the Ninja battled Morro and his forces before the Cursed Realm was destroyed.
The Ninja found fame after saving Stiix, but when Nadakhan returned with the Sky Pirates, Kai was the first of the Ninja trapped in the Sword of Souls. Jay freed him and reversed recent events with his final wish. On the Day of the Departed, Kai and Nya fought a revived Chen, who they defeated once more. When the Time Twins returned to Ninjago, Krux tried to convince Kai that Kai's parents were traitors. Kai and Nya reunited with their parents and stopped Krux and Acronix from changing the future. They managed to track them through time and stopped them before Wu sent Kai and Nya back to the present, while Wu ended up lost in the time.
Kai and the Ninja later watch over Princess Harumi after she lost her adopted parents. They later discover that she secretly is the leader of the Sons of Garmadon and wants to resurrect Lord Garmadon. Despite the Ninjas' efforts, Harumi successfully resurrects Garmadon, and shortly after, Kai ends up marooned in the Realm of Oni and Dragons with Cole, Jay, Zane, and the de-aged Wu. Kai and the Ninja help save the various dragons from the Dragon Hunters and help the now-teenage Wu regain his confidence and memories. After Iron Baron is defeated by Firstbourne, Wu reclaims the Dragon Armor, in turn allowing them to return to Ninjago. Upon returning, along with his fellow Ninja, he takes down Garmadon's Colossus while Lloyd defeats his father, restoring peace to Ninjago once again. Afterward, he along with the other Ninja attend the celebration and Kai and Skylor share a moment. When the Oni finally invade, the Ninja team up with Lord Garmadon, and Kai and the rest of the Ninja fight to defend their home. Kai used his blacksmithing skills to reforge Golden Weapons, using the Golden Armor, and later defeats the Oni by using the Tornado of Creation with the other Ninja, Wu, and Garmadon.
Months later, Kai and his friends fight against Aspheera and her Pyro Vipers after accidentally releasing them from their tomb, and Aspheera took away Kai's power, making Kai think that he can't help. After Zane is banished by Aspheera's sorcery, he and the remaining Ninja send themselves to the Never-Realm in order to rescue him, a land ruled by the Ice Emperor. While Lloyd went to find Zane, Kai and the others protected the Ice Fishers of Great Lake. After failing to prevent Boreal from freezing the village, Kai makes up for his loss by regaining his powers in time to destroy the Ice Dragon, discovering that Zane is the Ice Emperor. With Zane having managed to return to his senses and freeing the Never-Realm from its eternal winter, the team reunite together and use Traveler's Tea to head back to Ninjago.
Sometime later, Kai and the other Ninja enter the virtual world of Prime Empire, when the legendary arcade game resurfaces and hundreds of gamers are zapped into it. Due to his recklessness, Kai was the first to lose all but one of his lives, and later, he and Cole sacrifice themselves in a race, allowing the rest to win. Eventually, Jay was able to help Unagami and Milton Dyer make amends, releasing Kai and the others trapped in the game.
Kai was born in Ignacia, the first child of a blacksmith named Ray who owned the Four Weapons shop. He and his younger sister, Nya, were raised in their father's craft. Unknown to either of them, their parents were the Elemental Masters of Fire and Water. Kai inherited his father's element of Fire while Nya inherited their mother's ability of Water though they were unaware of this fact.
When his parents disappeared, Kai took it upon himself to keep the family business going, vowing to surpass his father's blacksmith skills. Kai also took care of his sister while wondering all their life what became of their parents.Nya, how to properly make a sword, but becomes too impatient and thus produces a disfigured weapon. He is reminded by his sister to be more patient, but are interrupted when an old man enters the shop. The potential customer voices complaints concerning the lack of tools for Ninja and Kai quickly shooed him away. Shortly thereafter, Ignacia falls under attack by Samukai and his Skeleton army. Kai attempts to defend them with samurai armor, though it proved to be slow and clunky. While he managed to defeat several skeleton foot soldiers, he was quickly subdued by Samukai. Pinned down by his armor, Kai would have fallen victim to the Skulkin General had the old man—Master Wu—not returned and saved him. However, while they were preoccupied, the skeletons kidnapped Nya and escaped to the Underworld. The young blacksmith intended to go after them but was stopped by Wu. He explains to Kai the story of the First Spinjitzu Master and his two sons who fought over the four Golden Weapons, explaining that an honest man—Kai's father—had been entrusted with the map to their resting places. Kai is advised by Wu to become a Ninja in order to save his sister, and Kai reluctantly agrees.
Kai is taken to the Monastery of Spinjitzu in order to be trained as a Ninja and learn Spinjitzu. During his training, Kai had to learn patience and how to harness the "fire" inside of him. This training consisted of running a course before Master Wu finishes his tea. Kai accomplished this after several days and does so by knocking the teacup out of his Master's hands when he was about halfway through the course. He is then told by Wu that he had one final test the next day, and should get some sleep.Creation to give each of the Ninja a suit that matched their elemental properties and pronounced Kai as the red Master of Fire. After Wu explained their purpose, he announced that they would now leave to claim the first Golden Weapon.
On the way there, Kai and the others explain where and how Master Wu found them. Kai reveals that he is journeying to the Underworld to save his sister, to which Jay replies "We're saving a girl? Is she hot?"
Once arriving at the Caves of Despair, Kai runs ahead of the other Ninja while Cole is still formulating a plan. The others catch up to him at Samukai's watchtower, and after Zane steals the map of Golden Weapons, Kai races ahead again. The other Ninja follow him into one of the caves and find him attempting to remove a large boulder from blocking a hidden room. They do so, and Cole reminded him that they were a team as they moved it together. Inside they find the Scythe of Quakes, and remove it from it's resting place. On their way out, Jay accidentally reveals their position to the skeleton army, and they were soon in a battle. After Jay discovered the key to unlocking his Spinjitzu, Kai and the others were quick to follow. They used it to drive off the skeleton army, after which they discovered that they had a bigger problem in the form of the weapon's guardian, the Earth Dragon. Kai happened to be holding the Scythe at the time and decided that the only way out was to use it, contrary to Master Wu's instructions. After escaping, Kai was strictly reprimanded by Master Wu, and they went onward toward the next weapon, the Shurikens of Ice.Frozen Wasteland, the location of the Shurikens, Wu tells the Ninja about the most powerful technique in Spinjitzu, the Tornado of Creation. Kai began to attempt it but was stopped by Master Wu, who explained that it could lead to disastrous consequences if done incorrectly.
After they succeeded in finding the Shurikens, the Ninja ascended to the Floating Ruins for the Nunchucks of Lightning. After retrieving it, they used Jay's gliders to descend into the Forest of Tranquility, where they made camp. Kai was later awoken in the middle of the night and lured to the Fire Temple by Garmadon, who was pretending to be his sister. Kai was forced to remove the Sword of Fire from its pedestal to cut a chain and save his sister from falling. He was then attacked and defeated by his own shadow under Garmadon's manipulation, but Master Wu arrived before the dark lord could claim the sword. Realizing it had just been a trap to lure them away from the other Ninja, the three attempted to escape but were stopped by the Fire Dragon. As a last resort, Wu sacrificed himself and ventured into the Underworld with the Sword of Fire. While his act kept the four Golden Weapons apart, Kai and Nya were still left in the hands of the Fire Dragon.
Once there, the Ninja attempt to use the stalactites to sneak past the guards of the Skulkin fortress but accidentally grabbed onto the legs of a Spykor. Out of fear, Kai and the others fell to the ground outside the fortress where they were quickly surrounded by Skulkin and Spykors alike. With their options limited Jay suggested they perform the Tornado of Creation and the Ninja successfully performed the technique, turning the fortress into a Ferris Wheel prison. The Ninja descended into the throne room where Master Wu was dueling Samukai for the Golden Weapons. Kai forbade the other Ninja to interfere as it was their master's fight. Wu was quickly defeated, but when Samukai took the Sword of Fire, a portal between dimensions was formed, and Samukai was destroyed. This allowed Garmadon to escape from the Underworld.
Knowing that he would one day return, Kai took the Sword of Fire and vowed to protect it, as did the others with their respective weapons.
Kai and the other Ninja returned to Four Weapons where they were reunited with Nya and assured the villagers they would be ready when Garmadon returned.
Ninjago at Peace
The Ninja are told to train by Master Wu but instead opted to spend their time racing their dragons. Jay won the race and began bragging about his skills. Kai and the others challenged him to another race over the forest and back, with the winner becoming "Dragon Master" for a month. Zane objected, feeling that the Ninja should be training, to which Kai replied that riding their dragons was a form of training.
The race begins, and Kai and Zane fly their dragons over the clouds, where they briefly dueled each other with their dragons' elemental breaths. On the home stretch, they were all neck-and-neck, but Cole won when he "activated the turbo"—a roasted chicken dangled in front of his dragon's nose. Once the others landed, Kai congratulated Cole on the win but said that they would get him the next day. Cole reminds the others that the winner was supposed to be "Dragon Master" for a month, and Kai and the others deny ever agreeing to the bet.
One night, Nuckal and Kruncha infiltrate the Monastery of Spinjitzu to steal the Golden Weapons from the Ninja while they sleep. Although the theft went off without a hitch, Kai was awoken when the Skulkin Generals lost control of the weapons and accidentally activated the training course. Half-asleep, Kai went outside to shut the course off, irritably reminding Jay that he had to repair whatever flaw was causing it to turn itself on. With that, Kai went back to sleep, completely unaware of Kruncha and Nuckal's presence in the Monastery. They quickly return the Weapons to the Ninja with haste and return to the Underworld.
While taking a ride on the Fire Dragon, Kai and Nya are suddenly taken to the Fire Temple. After dismounting the Dragon, Flame led Kai to a passage connecting Ninjago to the Underworld. Kai starts planning what to do when the ground falls out from beneath him. He finds that the Skulkin are assembling to reenter Ninjago, and gets caught in a fight. He fought back, but they picked him up, disarming him. Nya and Flame then shoot a blast of fire, which scares the Skulkin away and seals the passage to the Underworld.
- Main article: History of Kai (Rise of the Snakes)
In the aftermath of the Great Devourer's defeat, Kai and his friends spent much time cleaning up the great serpent's venom from around the city.
As the Ninja adjust to their reduced powers (thanks to the loss of their Golden Weapons), their thoughts turned to finding a new home and training Lloyd for the inevitable battle with Lord Garmadon. They met with a realtor, and she suggested they train Lloyd in the Ninja Suite, but Kai scoffed at the expense.
Deciding that they needed to live in comfort before they could properly train Lloyd, the Ninja opted for a lavish suite and took up jobs around the city to pay for the rent, with Kai taking up a job as an entertainer at children's parties.
Being occupied by their new jobs, the Ninja had limited time to train Lloyd, due to being too tired once they got back from work.
One day, the Serpentine suddenly rob a bank, and Kai, who was entertaining nearby, ran off the job to get there, resulting in him getting fired. Kai and Zane meet Cole there, who is in the middle of being fired as a security guard when they remember that they heard that the snakes were taking the subway.
They make their way down there and hop onto an oncoming train that is occupied by the snakes. They enter the train, and fight with the snakes as best they can without their powers. Eventually, they find that Jay is walking, albeit tied up, along the rails. They stop the train in time to save him but allow the Serpentine to retreat.
The Ninja return to their home and find Lloyd missing. They realize that they should never have left Lloyd, and should never have taken those jobs. At that moment, Wu, Nya, and Lloyd arrive. Lloyd reveals that he wouldn't be okay if Sensei hadn't saved him.
Dissatisfied with their jobs, they move into a smaller, dinkier apartment where they will be able to train Lloyd without any distractions.
Kai and the other Ninja began to properly train Lloyd, though soon realized their apartment wasn't the most suitable place. Wu sent them out into the city to look for a better training ground and they soon found Grand Sensei Dareth's Mojo Dojo. There they asked the owner Dareth if they could share the space to which he agreed if one of them could best him in a fight. While Dareth was showing off all his animal styles, Kai used Spinjitzu to send him to the ground, thus winning the fight.
Following their first session training Lloyd in the dojo, the Ninja left the dojo to find the city under attack by Captain Soto's pirates. The Ninja quickly boarded a bus and raced towards the boat. After stopping by Wong's Costume to disguise themselves as pirates, Kai and the others boarded the ship and confronted Soto's crew. After a brief fight and with the help of the Ninja, the pirates were eventually subdued.
Jay assisted in helping Lloyd use his Green Ninja power to light a light bulb at Dareth's Mojo Dojo. Despite the Ninjas' encouragement, Lloyd fails to light a light bulb and became mad. Just then, Nya rushed into the room carrying a letter stating that Lloyd's old school, Darkley's School for Bad Boys, has changed to Darkley's School for Great Children and that they wanted to Lloyd to receive an honorary award of excellence.
Kai and the others flew on the Ultra Dragon to the school where they are locked inside a room and discover that the students there had set it all up to get revenge on Lloyd. After very careful thinking, Kai and the Ninja escaped the 'prison' only to find that Garmadon had created evil duplicates of the Ninja, who had infiltrated the school and were attacking the students. The Ninja could not let the evil Ninja hurt anyone, so they attacked their evil counterparts. They would have been defeated if it weren't for the students coming to the rescue and confusing the evil Ninja, who let their guard down and were defeated.
Kai, along with the other Ninja, competes in the Ninjaball Run to win the prize of $100,000 in order to save Dareth's Mojo Dojo. The Ninja race in the Ultra Sonic Raider. Lloyd flies on the Ultra Dragon so that they have a better chance of winning the race. They race through dangerous terrain, and eventually Lloyd and his dragon crash putting him out of the race.
Even though the Ninja struggled to maintain a lead, especially when Garmadon enters the race. But thanks to a lever installed giving the Ultra Sonic Raider flight, and a piece of Ed and Edna's car Jay took after they crashed, the Ninja win the race and claim back the Destiny's Bounty in the process!
As the Ninja are trying to train Lloyd, they find out that he was anticipating to get the new issue of the "Starfarer" comic. Nya then came in to tell them to stop Garmadon, who broke into the Museum. After stopping them from reviving the Grundle, they realized they were turned into kids. When noting the Serpentine is stealing a sarcophagus, they chased them but noticed they're kids and that Garmadon's Mega Weapon did work. Eventually, the police came and accused them of stealing.
The Curator forgave them, asked what happened to the Grundle bones, which was missing. They explained it's been revived, but they didn't believe them, prompting them to escape by disguising themselves. They called Lloyd to meet them at Buddy's Pizza with their weapons. Lloyd then tells them he knows who can help them.
They went into a comic book store, where Lloyd introduces them to Rufus MacAllister. Rufus explained weapons are no use against the Grundle and that light, such as from an illumisword, can defeat it. After hearing they must be won, the Ninja motivated Lloyd to enter.
Lloyd, however, lost just before the Grundle came. They tried to get the door opened, but it's jammed. They grabbed the illumiswords, but they easily broke. Wu gave them the Tomorrow's Tea but hesitated to turn Lloyd into a teen. Lloyd threw the tea for them, ultimately defeating the Grundle.
Lord Garmadon uses the Mega Weapon to go back in time and make it so that Lloyd would never become the green Ninja. The Ninja later find out about his plan and jump into the portal Garmadon created with his Mega Weapon to stop him. The Ninja get back in time and fall through a portal. They find themselves in Ignacia, at the time Wu came to Kai's shop and even before Skulkins attacked the land. They catch old Wu and explained to him about the situation. This time, skeletons didn't kidnap Nya, and Kai from the past had no will to become a Ninja. Wu then leads him and Nya to the monastery. The Ninja decided to dress like skeletons and kidnap Nya so past Kai can get a reason to become the Ninja. They did that, and Garmadon took Nya to the Fire Temple. Present Kai reveals himself to his past self, and they work together to defeat Garmadon. They succeed by destroying the Mega Weapon and Kai, along with other Ninja, comes back safely.
After the Ninja reluctantly woke up for sunrise exercises, Wu told them they have to clean up the Ultra Dragon. They left Lloyd to do the job alone, but after he said it's not fair, they played a round of Rock, Paper, Clamp, with Lloyd losing. Before he started cleaning, he informed them that he lived at Darkley's School most of his life and that he doesn't remember his mother. Nya came along and told them the Museum needs their assistance.
The museum's curator showed them to the gift shop and said the Great Devourer's venom bought the Stone Warrior merchandise to life. The Ninja tried to keep it under control but wrecked the place in the process. When the Ninja met up with Wu, he introduced them to Misako, Lloyd's mother. When Misako tries to explain to Lloyd why she abandoned him, the Ninja watched him as he walked away.
After finding Misako and Lloyd at the Bottomless Pit exhibit, Misako explained to them about the Overlord. When the Giant Stone Warrior burst in, Kai was told to defeat it, but his katana broke and was thrown into a large vase. They eventually ran from the Warrior. Lloyd told them to distract him, to which Kai and the others agreed. They did just that, but have to run away after it broke free.
Kai helped train Lloyd to fight without using his eyes in Dareth's dojo, but they were soon interrupted by a series of earthquakes. They halted their training to tune into the news and learned that the aftershocks were getting worse. Kai immediately blamed Garmadon, though Misako pointed out that the Dark Lord would never do anything to harm his son.
The Ninja began to patrol the city for danger and even save a woman who was trapped by the collapsing street. The city soon falls under attack by the Stone Army and Master Wu orders the Ninja to send everyone to the NGTV office tower where they can be evacuated by the Destiny's Bounty. The citizens all climb to the roof while the Ninja hold off the Stone Warriors using the Ultra Sonic Raider and the Ultra Dragon. Kai continues to help hold off the Stone Army.
The Ninja sail to the Dark Island on the flightless Destiny's Bounty. Along the way, they run into a storm and the ship-eating Starteeth. When the storm passes the ship, which now is missing a rudder and has a hole in the side, the ship runs ashore on an island with a prison tower. After Dr. Julien told him the Skulklin trapped him there, he agreed to help fix the Bounty. The Ninja and Dr. Julien left the prison and continued their journey to the Dark Island.
The Ninja finally arrive on the Island of Darkness, where the Stone Army is preparing for the final battle. The Ninja learn that the Temple of Light is where they can receive their elemental powers. In order to do this, the Ninja must use a medallion to find the temple. Later Jay was able to find the Temple of Light by aligning three lights with the holes in the medallion—the temple is at the top of the island's highest mountain.
With their new vehicles, the Ninja head for the Temple of Light, barely keeping ahead of the Stone Army. Inside the Temple, they find pictures on the walls depicting their journey from the past until the present. Further in is a great bell, hanging above a strange design on the floor bearing the Ninja's symbols. Realizing that it's the Instrument of Peace, Lloyd strikes it, causing a light to shine on him and beams of energy to reflect off crystals in the walls. Soon, the entire room is crisscrossed with beams, and one hits a pillar, making it glow brightly. At the foot of the pillar, Kai's armor transforms, and an Elemental Blade with the power of Fire appears in his hand as well as the other Ninja. As their swords manifest blades representing their respective elements, Lloyd rises into the air. The Ninja use their swords to send their elemental powers to Lloyd.
The Stone Army finally marches into the Temple, but the Ninja are more than ready for them—using their new elemental powers, they easily trounce the warriors. Kai beats up some soldiers within a ring of fire. Finally, Lloyd summons the power of the Golden Dragon, creating a brilliant light that frightens the remaining stone soldiers into retreat.
At the beach, Dr. Julien repairs the Falcon, while the Ninja celebrate their restored powers by shooting down coconuts. The party is interrupted by Master Wu, who chastises the Ninja for their unseemly mirth; they may have the power to defeat the Stone Army, but the Celestial Clock is still counting down to the final battle between light and darkness. At that, Misako reveals a way to at least delay the battle: if the Helmet of Shadows is returned to its pedestal, the countdown might stop long enough for them to gain an advantage. Risking everything, the Ninja disguise themselves as Stone Warriors and escort Misako to Lord Garmadon's camp. As General Kozu takes Misako to his master's tent, the disguised Ninja are put to work carrying Dark Matter to the super-weapon. The weapon is surrounded by a wooden wall, but the Ninja notice one protruding detail—a very large cannon—and ponder what Garmadon plans to attack with it. Later the Ninja are, forcing them to fight their way back down to the entrance as Misako rejoins them.
The Ninja make their escape with Misako and Nya in the power drill, but the Stone Army pursues them until the Overlord reminds Lord Garmadon that the Ninja could turn the army against him if they don the Helmet. After a frantic chase that ends in the Power Drill being disabled momentarily, Garmadon goes for the kill, only for Lloyd to blast it with his powers. Lord Garmadon emerges from the wreckage, weakened and vulnerable; from the Power Drill, the Ninja encourage Lloyd to finish him off. Despite everything at stake, the Green Ninja is unable to strike the fatal blow, forcing him to jump aboard the Power Drill as the Ninja make their escape from the advancing Stone Army.
At the Celestial Clock, the Ninja meet with Master Wu and desperately look for the Helmet's pedestal with minutes to spare. As the Stone Army arrives, the Ninja find the pedestal and replace the Helmet, but it's one second too late; the countdown has ended and the final battle is upon them. As the clock fires a mighty energy flare inland, the Stone Army captures Nya and the Ninja are sent down into a crevasse. Surviving the fall, the Ninja head off to prepare for the final battle.
Kai returned with the other Ninja to the beach where the Bounty was hidden and met up with Dr. Julien. As Wu and Misako attempted to raise Lloyd's spirits to face his father in the final battle, Kai pledged his fire to the Green Ninja and prepared for battle.
The heroes set off to Garmadon's camp, intending to begin the final battle, but were surprised to find it deserted upon arrival. Misako quickly realized that the Stone Army intended to use the ultimate weapon on Ninjago to shift the balance and allow the Overlord to cross over, thus the Ninja followed the machine's tracks in the hopes of stopping it before it was fired.
As the Ninja ran, they recalled memories of their past adventures until they were ambushed by Nya, who had been turned evil by Garmadon's Dark Matter. Kai urged Wu, Misako, and Lloyd to continue on ahead while he and the other Ninja fended Nya off.
While at first having a hard time stopping for fear of injuring his sister, Kai quickly realized a way to trap Nya using their Elemental Powers, and before long they were on their way again.
The Ninja arrived at the beach in time to witness the Overlord take control of Garmadon's body, having fired enough Dark Matter into Ninjago to allow him to cross over. Reassuring Lloyd that they stood behind him, Kai and the other Ninja raced into battle to defeat the Stone Army. Kai used his Elemental Blade to cut one of the Stone Army's machines in half before commandeering one of Garmatron's cannons. As Lloyd faced the Overlord, Kai watched with the other Ninja as their comrade was defeated. The Overlord proceeded to open a portal to Ninjago, though it closed just as the Red Ninja attempted to pass through it.
Hitching a ride on Kai's Fire Robot, the Ninja returned to the Temple of Light, where they activated a hidden mechanism that revealed the Golden Mech. When Lloyd sat in the cockpit, his powers as the Chosen One restored the ancient machine to fighting form. With the Ultra Dragon's arrival to the Island of Darkness, the group was able to return to Ninjago City, only to find it infected with Dark Matter and ruled by the Overlord, now restored to his monstrous true form. Despite their fighting prowess, the heroes were almost overwhelmed by the Stone Army, only to be saved when Dareth donned the Helmet of Shadows and took command of the ancient soldiers.
Kai and the other Ninja proceeded to ascend the tower but only to watch them fall victim to the Overlord's corruption. Later he distracts Nya and Lloyd was forced to limp up to the top of the tower alone, where the Overlord was waiting. In the aftermath of the Overlord's defeat, all of his creations and corruption vanished. Kai reunited with his allies in the crater left by the Garmatron's disappearance.
Following the defeat of the Overlord, Ninjago entered an era of peace. Without an enemy to fight, the Ninja were no longer needed and thus began teaching at Master Wu's Academy. At one point, Kai was caught on video by Jay singing in the shower.
During a break on a rather stressful day, Nya approached Kai and the other Ninja and informed them they had received clearance for a field trip to Borg Industries. This didn't interest the Red Ninja who believed people should be learning from the past instead of wasting time on new technology, though he boarded the bus anyway.
Upon arriving at Borg Tower, Kai became stuck between the automatic doors, freeing himself just in time to board the elevator with the other Ninja as Cyrus Borg had requested to see them personally. After being introduced to the inventor, Kai questioned why the tower had been built atop where the Overlord had been defeated. Borg then presented them with a statue of himself as a gift for the Ninja, but promptly pulled Kai aside and ordered the Red Ninja to protect "them" with his life.
As the Ninja left with the statue, they accidentally dropped it and discovered new gis and the Techno Blades inside. Suddenly a robotic security voice in the elevator says that they should drop the blades. The Ninja refused, and the elevator drops toward the ground at high speed. The Ninja luckily escape into an elevator going up right next to it and manage to get their new outfits on for battle in their escape from Borg Tower.
When they get down of the tower, Master Wu takes the Techno Blades and says that he wants Kai and Zane in the air. Kai jumps on Zane's copter and hacks an enemy airplane, making it the Kai Fighter and reaching the outer space. While he was flying, Cyrus Borg gives him a visual message saying that a few weeks ago they discovered that new virus, Digital Overlord, in the industries' system. He also says that they have to bring the Techno Blades out of the city because if he finds out that they have them, he will never let them leave. After that, Kai gets into the sky fight with virus controlled planes. At the moment they almost get destructed, Lloyd comes on the Golden Dragon, defeating the robots. As the Ninja get back into the vehicles and get on the road outside of the city, Overlord spots that Wu is getting away with the Techno Blades so he sends two copters that capture him on the building roof. However before that happened, Wu quickly dropped Techno Blades into Kai's Fighter so the Ninjas could safely get them out of the city, while Wu gets captured by Overlord's forces.
After escaping from New Ninjago City, the Ninja hide their vehicles. Misako then greets them and shows them to the Monastery, but Zane offers to stay behind with the Techno Blades, as Garmadon (who is now "Master Garmadon,") forbids any weapons in his monastery. As night falls, Garmadon arrives and teaches the Ninja and his students about "the art of the silent fist." While everyone inside is practicing the technique, Zane catches P.I.X.A.L. and ties her up, then returns to the Monastery as the Ninja come out to see what is going on. Zane then uses his Techno Blade to hack P.I.X.A.L.'s systems, freeing her from the Overlord's control. Grateful to Zane for saving her, P.I.X.A.L. tells the Ninja of Master Wu.
Suddenly, P.I.X.A.L. realizes she did not come alone and Nindroids surround the place. The Ninja successfully defeat the Nindroids by trapping them into a mill wheel which then rolls out. However, General Cryptor destroys the Ninja's vehicles. After that, the Ninja decides to split. Jay, Zane, Cole, Kai, and Nya gets an idea to shut down the power in the city to stop virus controlling machines in the land. As night falls, they arrive at the station, but with a high guard of Nindroids. They manage to get inside but can't find a way to break the power charge. When Cryptor sends Nindroids inside, Kai remembers Garmadon's lesson of fighting without fighting so they decide to lure Nindroids to destroy the charge which then explodes and all the power disappears, including P.I.X.A.L. who gets shut down
The Ninja have gone to Ed & Edna's Scrap N Junk to look for parts that would enable Zane's hover-copter to run on solar power. While Ed, Jay, Cole, and Kai search through the junk piles, Nya transfers half of Zane's power source to P.I.X.A.L. Unbeknownst to the Ninja, Techno Wu arrives via hover-copter and powers Cryptor, along with a few Nindroid Warriors, using electrocobrai. After activating a few Nindroids, Min-Droid sneaks and gets access to Ed & Edna's crane. The tiny droid uses the crane and launches the truck at a garbage pile.
Kai realizes and quickly informs his friends; the Ninja perform Spinjitzu and get out of the fallen vehicle, while Ed and Edna escape using bubble jet-packs. Meanwhile, Jay and Cole are captured, Kai battles Wu clanging their weapons against one another. Eventually Wu manages to fling Kai away. Nya frees Jay and Cole and they assist Kai. However, Wu traps the Ninja in a corner, but Zane and P.I.X.A.L. come with a magnified vehicle and pick up Wu since he is now part metal. The Ninja are excited but quickly ends when the Stranger frees Wu and flies away with their via hover-copter. However, the Stranger leaves a scale behind. Nya decides to give Lloyd and Garmadon a message.
The Hover-copter was eventually converted to solar power, the Ninja returned to New Ninjago City with Nya and P.I.X.A.L. There, they reunited with Borg and explained their suspicions as to who stole the hard-drive containing the Overlord.
They eventually came across the Stone Army Tomb, only to find the seal had been opened. Upon confronting Skales, they learned that the Serpentine had reformed and the Snake King even had a son. The Ninja and Nya were lead to a campfire where Acidicus told them of the Curse of the Golden Master, and how they believed it was referring to Lloyd. While the Ninja discussed the curse, Nya expressed her confusion that if the Serpentine didn't take the hard-drive, who was the culprit.
Both questions had to be put on hold though, as Nindroids suddenly attacked the place, and Kai ordered the other Ninja and Nya to protect the Serpentine. The Ninja finds out that the Electrocobrai are their power source. Skales tells them at the Curse of the Golden Master is upon them, and says that they would not be able to assist the Ninja because they're choosing to stay out of the conflict. The Ninja then return to the surface, but not before Skales telling them the one Serpentine that is fond of electrocobrai: Pythor.
In the top of the Borg Tower, Borg prepares the device that will lead the Ninja to the Digiverse, where the digital overlord was, a digital world where they will be able to gain access to the Tower's central computer and fight the Overlord directly. When Jay points out that the hard drive is still missing, Borg explains the device will "download" the Ninja themselves, along with the Techno Blades, into the computer where the Overlord dwells. He also explains that this is the only method to succeed, as it will be a matter of time before the Digital Overlord fully drains Lloyd's power.
Although apprehensive, the Ninja are "downloaded" successfully, and they wake up in the Digiverse. In no time, they begin mastering the advantages of the digital world, except for Kai. the Ninjas begin their trek down toward the Tower's central computer—ironically below the Tower, where the Overlord had been defeated years before. When the Overlord realizes they are close to him, he attempts to immobilize them but fails due to P.I.X.A.L. electronically interfering from outside. He then turns the digitized New Ninjago City upside down, but the Ninja keep moving with their digitized vehicles. Kai almost died when he tries to jump off the digital Borg Tower because his vehicle disappeared, but gets rescued by Zane. Together they get to the top—that is, the bottom—of the tower and insert the Techno Blades only to find the Overlord severed the circuit to the motherboard.
The Ninja are severely beaten by the Overlord as he consumes more of Lloyd's golden power, proclaiming his becoming a true "golden master" of the real world and the digital world. Strengthened by Lloyd's proclamations that the Ninja always have each other's strengths to fight together, Ninjas fights off the Overlord's influence and turns gold and, using Lloyd's shared power, reroute the circuit to the motherboard and completely destroy the Overlord virus from the system, initiating a reboot.
At the Temple of Light, Lloyd gives up his Golden Power to restore the Ninjas' elemental powers. Meanwhile, at Borg Tower, Master Wu spots General Cryptor aboard a train heading for Ouroborus. going through a road near where Kai is.
Kai stands in a gas station flirting with a girl when P.I.X.A.L. calls him and tells about the Nindroids approaching. He jumps into his Prototype X-1 machine car and heads to the highway. When he comes to the bridge, he accidentally fires rockets to the sky which got spotted by Pythor who was driving in a leading fuel truck with General Cryptor. He then launches Nindroid flyers to hunt him and destroy his car.
Kai successfully repels their attack, but Cryptor fires rockets at a hill above them and soon rocks that got separated from the hill fall down to his car. They block the road, but Kai and P.I.X.A.L. destroy them with rockets. To hunt down General Cryptor's truck, P.I.X.A.L. activates his interception bike which Kai is unable to control so he bumps into the edge of the oil tank. He gets up to its roof and fights Nindroids, using his new fire power and Spinjitzu. This proves to be a mistake as he realizes that his fire power lit up the oil tank and that it's going to explode. Soon they got to a tunnel, where the Min-Droid attacks him. The X-1 machine, remotely driven by P.I.X.A.L, accidentally scrapes an oil tank so gas starts leaking. It soon gets to flame from the sparks of p Min-Droid fighting Kai. When the fire comes to the leaking tank, the whole tank explodes but Kai jumps off to Pythor's truck and saves himself. He stays beneath his truck and hears Pythor talking to the Overlord by radio. He tells people in Borg Industries that the Overlord is alive, but gets captured by Pythor who takes him to the lost city of Ouroboros.
By the time Zane, Cole, Jay, and Lloyd get to Ouroborus, they don't find anything new around until a huge door below them opens and they fall into an underground base where they find a huge rocket called "Arcturus." They realize that the rocket will lead Pythor and his Nindroid minions to space and reach the Golden Weapons from the star where the Mega Weapon was destroyed. Lloyd tries to stop him from lifting the rocket but Overborg stops him. With help from a freed Kai, the other Ninjas hold off the Nindroids with their new elemental powers. Pythor initiates the countdown for the rocket to launch into space, so Lloyd leads the Ninja into it just in time.
The Ninjas are in the Arcturus rocket as it flies through space. They make contact with Borg Tower and voice their concerns about their current predicament to Wu, Garmadon, Nya, and P.I.X.A.L.
The Ninja put the space suits just as the rocket disengages its unneeded engines. However when they climb up toward the door leading to the cockpit they are attacked by Nindroids, who fire on them with laser guns.
Following Jay's initiative of going commando and learning that their Spinjitzu does not work in zero-gravity, the others take the laser guns too so they successfully repel the attack. Soon the Arcturus enters an incoming comet's tail and is battered by massive ice meteorites.
The Arcturus rocket crashes on the comet's surface where the melted and fused forms of the Golden Weapons are located. The Nindroids and the hidden Ninja discover them as Jay excitedly finds an extraterrestrial beetle. Unfortunately, said bugs eat anything metal—a fact that reaches them from Nya too late. While the Nindroids get away with the golden mass aboard their ROV, the Ninja follow pursuit on their own while using the pursuing bugs against their robotic adversaries. The Ninja eventually succeed in taking Cryptor's ignition key to the rocket, so that they cannot leave the comet with the Golden Weapons and take them to the Overlord.
However, their victory is short-lived when they find another bug swarm among the rocket—chewed up in pieces. Seeing this as well, Cryptor and the other surviving Nindroids use their built-in boosters to fly off the comet with their golden prize. Stranded on the surface with the insects, the Ninja report to the others that they had failed and are not coming back home.
In space, the Ninja despair after repeated failed attempts to escape. However, Lloyd refuses to give up, suggesting that they use their elemental powers and everything around them to restart the ship. Heartened by Lloyd's words, the Ninja repair the ship and use Zane as a power source. Though Zane gets overheated by the strain, they manage to fly back to the Earth—to land safely, the Ninja uses a new technique: Elemental Shields.
P.I.X.A.L. uses a motorcycle to catch up with her friends, using her power to land them on their vehicles. As the Ninja reunite with their allies, Cyrus Borg tells them that they should head for the Temple of Fortitude, a place where the Overlord and the First Spinjitzu Master battled long ago. He claims there's a shield at the place, so the Nindroids won't harm them, and there is something he wants to give them that may help them save the world.
The Ninja start traveling to the temple but pause when they see the Golden Master's path of destruction. Lloyd reminds his friends that the only way to save Ninjago is to reach the Temple of Fortitude, but the Overlord sees them and uses a massive Spinjitzu tornado against them. The Ninja swiftly run back, rendezvousing with Cyrus Borg, Wu, and Garmadon. There Cyrus Borg gives them the ultimate weapon—a pill. Borg then explains that it was no ordinary pill, it could make anyone shrink. Garmadon and Wu decide to would hit the pill straight into the Overlord's mouth. Borg gives the Ninja armor which protects them from some attacks from the Overlord.
The Ninja go into Ninjago City, when an item hurls at them but are protected since they have on the armor. Wu hits the pill, which heads straight to the Overlord's mouth, but Pythor sacrifices himself and swallows the pill instead. As a result, Pythor shrinks down to the size of a worm. The Golden Master is outraged that the Ninja tried to shrink him. He obtains the Ninja with his Golden Power only to miss Zane. The Ninja of Ice tells his friends to support him one last time, and the Ninja bounce him. Although, during the process, he landed and touched the Golden Master's gold. He refused to let go, admitting the fact that Ninja never quit, which frees his friends. He remembers his past, and freezes the Overlord which also killed him and the Golden Master. The Ninja are disappointed that Zane has passed, and proceed to his funeral.
Borg makes a speech on how he thought technology was the best way to destroy problems but instead cost more. He now names Zane the Titanium Ninja and passes the microphone to Kai. The Red Ninja claims no one knew what powered Zane, and he thought it was brotherhood because that's how Zane powered him. Saying that Ninja will never be forgotten, Kai says no matter where Zane is, he'll always be part of the team. When he finished his speech, snow began to appear.
- Main article: History of Kai (The Tournament of Elements)
With Garmadon gone, Kai took Lloyd under his care and promised to watch over him. He and the Ninja used their Elemental Dragons to capture a Fangfish that had been terrorizing a local village, though Kai bragged that he once had caught one twice as big. Upon returning successful to Wu's new tea shop Steep Wisdom, Kai and the others were sent by their Master into Ninjago City to advertise the new store, yet without using their powers. While they obeyed their master at first, after failing to attract anyone Kai decided at use his elemental powers to create a teapot out of fire.
Unfortunately, Morro possessed Lloyd's body and the other Ninja lost their elemental abilities. They returned to Wu for answers just as the tea shop fell under attack by the Master of Wind. Kai attempted to help Lloyd regain control of his body, but was taken away by the Ninja as the fled in the Destiny's Bounty just as the Green Ninja was starting to regain control.
Morro soon caught up to them using his Elemental Dragon and while the masters of earth and lightning fended him off, Kai and Zane escorted Wu to their quarters for him to make an imprint of the staff's secret message. The ghost ninja crippled the flying vessel however and soon confronted Kai who was almost thrown out of the Bounty. He was saved by Zane, but the ship crashed in the Forest of Tranquility.
The Ninja made camp and Wu told them of his past with Morro. That night Kai dreamt of him promising to look after Lloyd, only for the Green Ninja to be eaten by a Fangfish. He was awoken by a walliper to find that Misako has arrived and discovered that the first symbol means Airjitzu, a martial art created by Master Yang, though discover that Ronin had recently stolen the only known scroll. The Ninja mount wallipers and Kai leads them towards Stiix where Ronin was keeping the scroll.
Unfortunately, their head start was lost when Kai lead them away from Stiix rather than towards it. After Zane pointed this out, Jay and Cole elected to follow Zane instead and they soon came across train tracks leading to Stiix.
After nightfall, they came to a train station and stopped, intending to rest. However, they were soon beset by Wrayth on the Chain Cycle and engulfed in a frenzied battle against the ghost menace. Incidentally, he defeated himself when his chain hooked on a nearby water tower and poured its contents onto himself. The Ninja were left stunned by this, but realizing that a passing train was headed to Stiix, quickly ran after it.
The Ninja eventually arrived in Stiix and confronted Ronin in his shop. The thief demanded a high price for the scrolls, but due to Kai's horrible negotiating skills, it was raised even higher. To earn money, the Ninja were hired to build a dock and Kai operated the crane. Unfortunately, a fly damaged the Titanium Ninja's language database and they ended up accidentally destroying the bridge. With Zane unable to speak, Jay took charge and decided that they should simply steal the scrolls.When they did, however, Morro and his latest summoned partner Soul Archer had arrived at the shop for the scroll and summoned more ghosts. Using the Aeroblades, they got rid of the ghosts; unfortunately, Ronin called for R.E.X. and took the scroll but didn't get far thanks to Morro. Kai chased after Morro but failed to regain the scroll. In addition, Ronin offered to help Kai out of the strangle weed in exchange for something: Kai gave him everyone's business shares of Steep Wisdom. In return, Ronin told him of an alternate way to learn Airjitzu: Master Yang's Haunted Temple.
During nightfall, the Ninja sneaked into Yang's Temple in order to retrieve the Scroll of Airjitzu. After pranking Cole, the Ninja tried to warn him that a thudding sound they heard was real. The Ninja were eventually forced to avoid all the obstacles Yang threw at them, and they decided to tie themselves together to prevent themselves from running away.
The Ninja then have to chase Morro into the attic, where Yang gave them the Scroll. After realizing the sun's almost up, the Ninja fled the Temple but was surprised and saddened to see Cole as a Ghost.
Kai began complaining about his new Deepstone suit because it was heavy, which he believed prevented him and the others from performing Airjitzu. Wu told him that it would protect him from turning into a ghost. Sometime later, Soul Archer shot him in his chest, but the Master of Fire didn't turn into a ghost.
Once they were nearing the highest peak of the Wailing Alps to beat Morro from reaching the Cloud Kingdom, Kai was the first to successfully do Airjitzu up to the top. He was then able to encourage Cole by telling him ghosts can't die, which helped him perform Airjiztu and allow them to beat Morro into the Blind Man's Eye.
Upon reaching the gates of Cloud Kingdom, Kai and the other Ninja were greeted by Fenwick. They were then shown inside the writing hall where the Ninja learned that the citizens of Cloud Kingdom were the writers of destiny.
Fenwick proceeded to inform the Ninja that Morro sought the Realm Crystal hidden in the tomb to unleash The Preeminent, before ushering them into a building filled with toys to meet the "master writer." They quickly discovered it to be a trap as they had been locked away with Nimbus, a terrifying creature. With Cole's ghost abilities, the Ninja managed to escape and discovered that Fenwick was actually working for Morro.
The Ninja soon ran into Nobu who informed them where the Sword of Sanctuary was kept, though the Ninja arrived just after Morro claimed the sword. With it in hand, the ghost was able to escape from Cloud Kingdom though after an intense chase down the Wailing Alps, the Ninja emerged victor with the sword in possession.
When the Ninja are preparing Stepped Wisdom for a Ghost attack, Kai puts up a bucket of water on top of a door. After hearing a bell ring, Kai and the others hurled water balloons at the Postman, thinking he was a Ghost. The Postman then told them they're going out of business due to the lack of customers. They then decided not to tell Ronin so he can stay and help them.
When the Ninja were told to come in Steep Wisdom so Misako can explain the third clue, Kai asked Ronin what he's looking for, to which he said he was just sorting the tea blends. Misako and Wu told them about the three tests and that Kai reminded her earlier about a map at the back of the Scroll of Airjitzu and that the reflection on the sword just might tell them the location. They went outside to stop Ronin from stealing the sword, but was caught in the traps they had set up earlier. When they chased after him, they realized his ship was empty.
They later got a message from "Ronin" stating that the tomb was located in the Caves of Despair. They checked it out, and found the skull symbol at the entrance. They initially thought the lanterns they encountered were the first of three tests, but was proven otherwise when nothing happened. They encountered a Kethanol geyser and when Cle blocked it with a boulder, it erupted and they found themselves riding on minecarts. Before they could fall into a pit of lava, R.E.X., on autopilot, came by to save them. Ronin, on a message, said he'll let them borrow R.E.X. to travel to the real location of the tomb, under the ocean.
Arriving at the tomb's entrance after nearly avoiding the Leviathan, and accidentally leaving their Aeroblades behind, the Ninja head inside and found themselves surrounded by sixteen doors, each with images on it. P.I.X.A.L. informed Zane they're in a zoetrope, and they have to use Spinjitzu to find the correct symbol. He did so, and they enter the door with the Yin-Yang symbol.
They entered the second test room, with Kai determined to reach the staff, activating most of the traps. Cole had the idea to jump down the hole they made, and after it works, he reluctantly followed suit.Falling into the third test room, the Ninja, except Cole, saw their future in the wall's reflections. They spotted Morro, and Kai was able to trap him with stalactites. They solved the test by digging straight down and end up in the tomb.
Suddenly, Morro, who managed to escape Kai's trap, threatened to kill Lloyd if they don't give him the Crystal. The Ninja realized they have their powers back, but it's weak. Kai secretly burned the Crystal, Making Morro drop it into a nearby river. Lloyd attacked him, but Morro pushed him down the river, with Kai and Cole trying to save him. With Cole not being able to touch water, Kai dove in to save him, however, he was not able to grab the Crystal in time, resulting in Morro winning. When they got out of the tomb, Kai comforted Lloyd that they'll grow stronger as he recovers.
Kai and the rest of the Ninja went to Steep Wisdom to get vehicles Cyrus Borg built. Unfortunately, Kai only got a headband due to the lack of time. Kai suggests they use Nya as the key to get close to the Ghosts, to which she agrees.
Trying to distract the Ghosts, Kai poured tea on one of them, getting them to chase him. Eventually, he tries to stop Lloyd from listening to Morro when he's trying to destroy the Crystal but failed. The Ninja were forced to watch Lloyd get captured into the Cursed Realm.
Kai tried to weaken the Preeminent by using his Fire, but she didn't budge. When Cole was about to use his Blaster Bike on the Preeminent, the Ninja kept shooting their powers at her to cover him.
Kai suggests they get closer to the Preeminent to save Lloyd, but it was no use. They have to go back to the ship. They see Lloyd come back, and had to destroy the stilts to drop the Preeminent into the sea, after which the Ghosts defended her with houses. He went closer to the Preeminent, allowing the Ninja to follow suite.
He fell into the water, but Zane told him to use his Fire on Soul Archer and together with his Ice, they were able to make water to defeat him. However, the Ghost respawned, much to their disappointment. They went back to the ship in order to defend its passengers. He watched as Nya destroy the Preeminent with her unlocked True Potential.
Following the defeat of The Preeminent, the Ninja rose in popularity and began being treated as celebrities. Kai in particular loved the attention. Following the discovery that Clouse had managed to escape the Cursed Realm, Kai and the other Ninja headed to Stiix to stop him, taking a brief detour to the hospital for Lil' Nelson's Grant-a-Wish. Upon arriving in Stiix, the ninja were unable to locate Clouse and discovered to their horror that they had been framed for a crime free. Now wanted criminals, Kai and the other Ninja were forced to split up to avoid detection.
After a brief meeting with the other Ninja where they discovered that a Djinn might be behind their framing, Nya and Kai headed to Jamanakai Village where Nya had hid spare bikes. Upon receiving a distress call from Zane, the two headed to the Corridor of Elders, only to be ambushed and captured by Ronin, who had been paid to round up the wanted Ninja. Once all six of them had been captured, they were lead onto a bus bound for Kryptarium Prison.
While at Kryptarium, Kai and the other Ninja learned from Captain Soto that this Djinn was none other than Nadakhan, a feared pirate captain whom Soto had trapped himself centuries ago. That night, as part of Lloyd's prison break plan, Kai found Soto and freed him from his cell in exchange for information on how to defeat the Djinn.
While Cole and Lloyd tried to find the Misfortune's Keep, Kai and Zane were assigned to recover the Destiny's Bounty 2.0. However, after being attacked by the guard and his dog, the two of them were forced to flee.
Later, after regrouping with the other Ninja at Yang Tavern, they learned of Misfortune's Keep attack on Ninjago City and decided to come out of hiding to defend the innocent and retrieve Soto's Lantern. During the battle, Kai and Jay were separated by an explosive barrel thrown by Monkey Wretch. Before Jay could catch up, Nadakhan transported the Red Ninja to Cannon Beach to trick him into using his three wishes.
In an attempt to escape, Kai wished to go back, only to be taken back in time to when his father was a humble blacksmith. After witnessing his father ask for his help, Kai, not wanting to mess with the timeline, demanded that Nadakhan return him back to a time when the latter wasn't present, when his fan girls still appreciated him, etc. Because of the high content of his wish, Nadakhan instead chose to focus on a single aspect, transporting Kai into an alternate reality where all of the psychotic fan girls began chasing him around. In desperation, the Red Ninja was goaded into wishing it all away, resulting in his imprisonment in the Djinn Blade. As a result, Nadakhan would use the power of his soul to begin tearing chunks out of Ninjago.
Whilst trapped inside the Sword of Souls, Kai would be freed by Jay alongside the rest of his imprisoned allies, their release resulting in the defeat of several Sky Pirates converging on their position.
After thanking the members of Jay's new team, Kai went with the other Ninja to stop Nadakhan from marrying Nya. However, they failed to stop the ceremony and retreated before Nadakhan could capture them. Regrouping on the Misfortune's Keep with the now reformed Dogshank and Flintlocke, they discovered from Jay not only where Clancee kept the Tiger Widow Venom but also the true reason behind the wishes Nadakhan granted: their inabilities was only interpretation on Nadakhan's part: in the end, Nadakhan's powers were limited in that he had to solely rely on his victims to accomplish his wishes, as the ability came from its rightful owner. With this, Flintlocke regained his aim and was declared the one to shoot Nadakhan with the venom while the others distract the Djinn.
The Ninja put the plan into action, though discover Nya has been possessed by the now-revived Dilara. Although they evade most of the attacks, Nadakhan turns them into gold statues until only Jay is left. Flintlocke is soon able to take the shot, successfully hitting Nadakhan and his power begins to diminish: unfortunately, the venom also hit Nya, who soon dies in Jay's arms. Everyone is devastated, Kai having to be comforted by Zane while the weakened Nadakhan musters up his remaining strength, though it's in vain as Jay wishes from the heart that Nya had taken his hand and that Nadakhan was never freed. Time soon reverses to when the ninja are on the roof of Ninjago City hospital with only Jay and Nya remembering all of the events. The two renew their relationship, which everyone is happy for, though Kai becomes disgusted from seeing his sister kiss Jay but eventually accepted it.
Dark Island Trilogy
Kai and the other Ninja were summoned to the Samurai X Cave by Master Wu, who informed them that Misako and Ronin had gone missing off the coast of the Dark Island. The Ninja quickly readied the Destiny's Bounty and they set off towards the island.
Upon nearing the island however, the Bounty encountered an unnatural storm that sent the Ninja falling from the sky. When Kai awoke, he found himself alone in the middle of a vast desert.
Using their new vehicles—including the components of the Ultra Stealth Raider—the Ninja traveled to the Ninjago Museum of History on the Day of the Departed in order to acquire lanterns for the celebration. After viewing the Hall of Villainy, the Ninja split up to pay their respective requests, inadvertently leaving Cole behind. Kai and Nya traveled back to Four Weapons Blacksmith in order to commemorate their parents, and Nya questioned whether they would ever learn what really became of them. Chen and two of his Anacondrai Cultists, revived by the dark magic of Master Yang, then arrived to attack the pair, but they were able to defeat the villains and destroy them. Returning to the museum, they found their friends and learned they went through similar experiences, wondering what the cause was before Wu and Morro arrive telling them it was Yang's plan.
Seeing Morro, Kai and the Ninja armed themselves as Jay question how many other ghosts there were left with Kai stating they've stopped several others and what's one more. He is surprised when Wu tells them that Morro was there to help and the latter tells them that Yang tricked Cole into opening a rift to return to Ninjago. The Ninja soon realized they forgot about Cole and Wu orders them to ready the Bounty and head for the Temple of Airjitzu while a redeemed Morro returns to the Departed Realm.
The Ninja used the Bounty to travel to Yang's floating Temple of Airjitzu, where they are caught in a powerful storm with wind blowing their ship around. However, their timely arrival gave Cole the drive needed to win and they watch as he overpowered Yang.
Kai and the others become confused by Cole speaking to Yang telling him he needed to pass through the Rift.
The Ninja watched as the Rift closes before getting caught in its shockwave, forcing them to make a crash landing on the ground of the floating Temple. Once they landed, they feared if Cole hadn't made it through the Rift in time but were overjoyed when he emerged from behind a rock, a human again. The Ninja happily hugged their friend, relieved to have him back to normal. Kai soon pointed out the restored Temple of Airjitzu and at Cole's suggestion, they make it their new base.
Later that night, they gathered around a fire with their families and friends listening to Cole's story before releasing lanterns into the sky in celebration.
- Main article: History of Kai (The Hands of Time)
While Kai and Zane fought the Mechanic, P.I.X.A.L. asked them to meet with Lloyd. Zane eventually defeated him with Ice, but accidentally froze Kai in the process.
The Ninja regrouped, and Lloyd showed them the Sons of Garmadon logo and said they stole a mask. Hutchins informed them of the Oni Masks and that the Emperor of Ninjago will have a speech. The Ninja agreed to defend the mask during his speech.
During the speech, firecrackers went off, causing the audience to panic.The Royal Family is grateful they tried to save them and they were invited inside the palace.
The Royal Family informed the Ninja as long as they have the Oni Mask, their lives are in danger. The Ninja accepted the challenge to keep them safe and were given a tour with Hutchins.
When Hutchins showed them the Oni Mask of Deception, the Ninja agreed to protect it. Kai and Nya went onto the roof and saw Hutchins suspiciously walking away from the palace. When he noticed them, he walked back inside.
While training, the Ninja gave Lloyd some advice on how to attract Harumi, but Lloyd agreed with Nya to just be himself.
While helping guard the palace, Kai informed the Postman no one's allowed in the palace and that he can deliver the mail.
When the palace exploded, the Ninja fought the Sons of Garmadon. Later, Lloyd and Harumi picked them up on the Destiny's Bounty and informed them the Emperor, Empress, and Hutchins didn't survive.
When Lloyd and Jay came back from Mistaké's shop, they watched Cole karaoke at Laughy's on television. Cole was attacked by the Sons of Garmadon and when Zane didn't help, the Ninja went to help him. While they were chasing Mr. E, Lloyd realized Zane was trying to gain their trust.
When Lloyd was unable to find Zane or Cole, Jay and Kai checked the other stations.
After the Ninja found Zane shut off at the bottom of a cliff, they took him back to the Bounty. They then decided to leave Ninjago since the baby is the key the the Mask of Hatred.
When P.I.X.A.L. then informed the Ninja Mr. E told the Quiet One "The trap has been set." She told the Ninja she's trying to find the location of the Quiet One, but Cole showed them the baby's blanket with the map to the third Oni Mask on it.
When P.I.X.A.L., controlled by the Quiet One, shot one of the thrusters, the Ninja fought her. Just when she went back to normal, her destroyed another, causing the Bounty to fall. Nya was able to control the rain to slow down their fall, but the Bounty was damaged.
As they tried to fix the Bounty, the baby, who had a growth spurt, hands Jay a pair of pliers, surprising Kai and the others. Kai is shocked to see the baby drink tea, before the child said their motto: "Ninja never quit," after Jay stated he quitted. This makes them realize the baby is a regressed Master Wu, which shocks them.
The Ninja tell Nya the things the baby did and how they discovered he is Wu, she doesn't believe them until she hears the baby talk. Afterwards, questions are raised by how Wu reverted to a toddler; Nya brings up Wu being touched by the Reversal Blade before he was lost in time. Kai questions his sister who states that it could of caused him to de-age. Kai listens as Zane states if Nya is correct, the blades' effects have worn off and now Wu will keep aging until he returns to normal, eventually.
The Ninja later discover Harumi is the Quiet One as the Sons of Garmadon attacked and surrounded them.
The Ninja, now tied up in chains, try to convince the Sons of Garmadon not to resurrect Lord Garmadon, to no avail. When Killow calls for Ultra Violet, Wu hands them the keys and they start to confront the Sons of Garmadon.
During their standoff, they were reunited with Lloyd and Crabby attacked. The Sons of Garmadon leave on the Bounty and Lloyd followed them after they froze Crabby in ice. They were shocked when Lloyd was captured and Crabby started to break free.
After the Ninja tamed Crabby, they rode it to the police station. They told the Commissioner the Sons of Garmadon are going to resurrect Lord Garmadon and need reinforcement.
While the police attack the Sons of Garmadon, the Ninja traverse to the Temple of Resurrection. They defeated the Sons of Garmadon and rescue Lloyd and Misako. They helped as the police arrested the Sons of Garmadon.
To celebrate, the Ninja went to Laughy's to karaoke. However, the music was cut off and they watch the news about Garmadon breaking Harumi free from jail.
The Ninja went to the police station to question the Commissioner. The Commissioner confirmed he was Garmadon They watched the news again and realized Harumi and Garmadon are at Kryptarium Prison.
On the Bounty, the Ninja told Lloyd not to face his father. They later were tricked by the Green Ninja, who locked them in a room so he can go it alone.
When the Sons of Garmadon broadcasted Lloyd's fight with Garmadon, the Ninja are forced to watch.
The Ninja went to Mistaké's tea shop in order to help Lloyd recover. However, they could lose their Elemental Powers. After thinking, he changed his mind and they all decided to help Lloyd.
They still have their Elemental Powers and Mistaké gave them tea in a bag. When the shop rumbles, they go outside to see Ninjago's citizens panicking. Nya stays with Lloyd while the other Ninja and P.I.X.A.L. go see what it is. They found Colossus and started attacking, but were forced to hide. P.I.X.A.L. decided to distract it while the Ninja run away.
The Ninja tried to pick up Lloyd on the Bounty but instead, they only got Wu. Before the Colossus could destroye the Bounty, they used the tea Mistaké gave them, which turned out to be Traveler's Tea. They woke up in the Realm of Oni and Dragons.
- Main article: History of Kai (Hunted)
Kai helped Jay practice how to ask Nya to be his Yang but after showing him how to act with confidence, Jay dismissed the idea. Afterwards, Dareth comes in and Kai told him to keep it a secret. Nya also comes in to show them her new kimono and they all went outside to look at the new murals with Wu. Suddenly, they saw Firstbourne crash and landed near the mountain. They ran to her and saw Faith was also badly injured. They brought her inside the Monastery to help her heal.
Faith mentioned that darkness swept over her home realm and that she barely escaped. Wu points out it might be the Oni and the Ninja head to the Bounty to prepare.
When they arrived at the city, the Ninja rescued the people. They tried to fight the darkness with their powers, but it had no effect. They retreated back on the Bounty and Lloyd told them Garmadon might be able to defeat the Oni. They went to Kryptarium to release him.
Once the Ninja are airborne again, the Ninja discussed if they could trust Garmadon. Meanwhile, he turned the engines off, and the Bounty starts plummeting toward the ground. The Ninja hanged on until Zane got to the ignition switch in the nick of time.
While Lloyd followed Garmadon to the cabinet, Kai told Jay he should ask Nya to be his Yang as soon as possible. Cole joins in and tells him the same, but Zane told them they were needed on the bridge. Garmadon proceeds to tell the Ninja about how the Oni were able to enter Ninjago. They used the Realm Crystal and he would be able to go inside the dark cloud to destroy it due to being part Oni, but he would need a weapon. Lloyd then argues that they can't just let him have a weapon then let him walk away unsupervised. Since Lloyd is part Oni as well, he claimed would also survive the darkness and decided to go with him.
When they arrived at Borg Tower, the Ninja handed Garmadon a sword, but he started attacking them to activate his powers. He jumped off, and Lloyd followed. After watching Lloyd on his head cam, they heard distress calls and tried to find the source. They flew off, while P.I.X.A.L. decided to stay behind in case the two needed assistance.
While trying to find the source, the Ninja watched as Lloyd and Garmadon approaches the Crystal. When The Omega attacked them, his head cam broke.
The Ninja found the source of the distress signal at the NGTV building. Jay and Cole went out to help the people, but once they were about to leave, Nya accidentally turned the thrusters the wrong way. This caused Cole's rope ladder to snap as the Ninja watched him fall. Kai tried to turn the ship around, but Zane convinced him otherwise.
They went to save P.I.X.A.L., Lloyd, and Garmadon as they ran out of fuel. The Ninja told them Cole fell off the Bounty, and Nya blames herself despite Jay and Kai saying it was an accident. After Garmadon told them they are wasting time mourning, he showed them the Golden Master's armor. However, everyone was upset at him and started leaving.
Nya still blamed herself while Kai tried to reassure her by telling her she's the one that makes plans for the Ninja. She then said they can go back to the Monastery of Spinjitzu to forge the armor's metal back into weapons. Despite Kai being hesitant, he agreed.
The Ninja landed near the monastery and Wu and Misako went to see them. They told the two that Cole fell into the dark clouds and destroying the Realm Crystal did nothing. However, Garmadon showed them the Golden Armor and Nya explained they might have a chance if they reforge the Golden Weapons. After Kai was done, he gave the weapons to their respective Ninja, but had to give the Scythe of Quakes to Nya. A monk then signals to the Ninja that the Oni are here, and they prepare to fight.
The Ninja began the fight them and were surprised to see Cole arrived. Nya then hands him his Scythe but they were overpowered and retreated into the monastery. They then watched as Jay asked Nya to be his Yang, to which she accepts. Lloyd then points out that they can try using the Tornado of Creation against the Oni.
However, they found Lloyd under a pile of debris and mourned. He suddenly woke up and the Ninja were relieved. As celebration, their allies visited the monastery and watched the Ninja make a new mural with their handprints.
- Main article: History of Kai (Secrets of the Forbidden Spinjitzu)
Kai and the rest of the Ninja were chasing The Mechanic after he robbed a warehouse. However, The Mechanic was able to flee quickly. When Nya and Jay join the the Ninja late, Lloyd asked about their previous whereabouts and Jay and Nya lied about what they actually did.
Kai and the rest of the Ninja fight The Mechanic and his crew when they were caught robbing an old electronics warehouse. Kai catches the motherboard when it falls out of The Mechanic's hand, but he is forced to throw it elsewhere when The Mechanic's Henchmen attack him.
Eventually, The Mechanic runs away in his Noodle Truck, so Kai uses his Katana 4x4 to chase after him. During the chase, he is driven off the road, but Cole manages to chain his vehicle and The Mechanic is arrested shortly after.
The Ninja then explore The Mechanic's Headquarters since he was trying to run away into that building. While Jay is trying to play Prime Empire, the rest of the Ninja continue to explore. At some point, they reach a room containing weird symbols and find a computer asking the Ninja if they found the motherboard. Zane replies with yes and the voice, name Unagami, commands them to play the game which confuses everyone.
The Ninja head back to tell Jay, but he mysteriously disappears.
The Ninja search around The Mechanic's Headquarters, but cannot find Jay. That's when Nya realizes Jay was able to turn on the Arcade Pod. The Ninja then look on video and discover that the shockwave was from the Arcade Pod as well as Jay being able to enter Prime Empire.
The Ninja interrogate The Mechanic but he refuses to give answers. Meanwhile, the Police Commissioner comes in and reports of all the Arcade Pods turning into Prime Empire. Kai concludes that the shockwave caused all of the games to change.
The next morning, the Ninja would head to Dyer Island in hopes of finding Milton Dyer, the creator of Prime Empire. They encounter many traps such as statues that would fire lasers as well as Robot Dogs. Fortunately, Bob the Intern turns of the security system and lets the Ninja inside the Dyer Mansion.
The group would ask questions about Milton Dyer and Prime Empire, and after the conversation with Bob, the Ninja believed Milton Dyer was Unagami trying to seek revenge.
The Ninja head to Borg Tower to see how Borg's study on the game has been doing. In his office, Borg explains that not only Jay is inside Prime Empire, but over 800 people as well. When they decided teams on who's going into the game while the others find Milton Dyer, they are alerted by the Escaped Prisoners making their way to the office to stop them. Kai then realizes that when Cole began to play the game, he berates him on not even starting and just picking an Avatar. He then attempts to go and fight the Escapees, but Borg tells them that going down there wouldn't be wise, seeing as he security systems will fight anything that is living down there, which includes Kai himself.
Nevertheless, Soto, Ultra Violet, the Mechanic, and a couple of other prisoners make it to the top. Kai and Zane attempt to hit Soto with their powers at the same time, but they collide and create water under Soto's feet. As the Pirate Captain teases them, Kai watches Zane freeze the water beneath him, turning it into ice and causing Soto to slip into the desk. Kai, along with his friends, continue to fight the villains as Cole attempts to reach Level 13. He is busy holding back Soto when Cole manages to do this and goes to follow him into the game. Realizing that Soto and some of the prisoners were trying to chase her brother, Nya lets go of the police tape that she and Lloyd wrapped around Ultra Violet, causing her to fall onto her allies.
Once inside the game with his teammates, minus P.I.X.A.L. and Zane, Kai is amazed to see the Game World around them.
Kai and his friends continued to look for Jay inside Prime Empire until they are attacked by the Red Visors. He along with the rest of the Ninja attempt to use Spinjitzu and their Elemental powers, but only end up getting dizzy from spinning with no tornado forming around them and doing Jazz hands. As they duck for cover, Kai reminiscences the time Aspheera stole his powers and berates on how he and his friends always seem to lose their powers. He then witnesses "Jay" fighting a Red Visor and calls to his friends about this, who seem to also see other Jays fighting. Confused on why there was more than one Jay, Cole explains that they are some of the people trapped inside the game and made their avatars look like Jay. When they spot drones coming, the Jays tell them to follow as they double jump to the rooftop. Cole tells them what the double jump was and Kai told him that made no sense, but went with it anyway as the drones followed them.
Being cornered by drones from all sides, the Ninja and Jay Avatars fight the drones. The Jay Avatars being easily able to take them out, while the Ninja struggle with one of their own. Kai jumps on the face of one drone but is blasted off easily by its laser, sending him flying off the building and killing him. Kai then respawns next a grieving Lloyd after seeing his death. Both Kai and Lloyd are confused and Kai is impressed that he just respawned. Following the Jay's advice, they head to an alleyway below after hearing a codename.
The Ninja suddenly spot three Red Visors up ahead. Lloyd, Nya, and Cole hide, but Kai, thinking the game has unlimited lives, stands in the open and taunts the Red Visors. The Red Visors kill him and Kai respawns again after the Ninja defeated the Red Visors. Kai re-spawns and expresses how much he likes the ability of "infinite lives." Cole tries to tell him how lives in a video game work, but Kai ignores him as they move on.Arriving at the location, which was an empty parking lot, the Ninja are confused by the turn of events; Kai concludes that the Jay avatars are crazy since they love Jay so much when a masked stranger holds them at gunpoint. Nya tells him the code name the Jay Avatars mentioned earlier and the man invites the Ninja inside his hidden garage. The man reveals his name to be Scott and what he's been doing in Prime Empire, when Kai foolishly kills himself by touching one of Scott's belongings; because it was an explosive. Upon re-spawning, Kai tells Scott how cool it is to have infinite lives. Scott denies this and shows him his health board, which is down to one. Kai gets mad at his friends for not saying anything and Cole responds by saying when he did try helping him, but he didn't want to hear anything.
Kai and the rest of the Ninja head out with Okino into the Forest of Discontent. Their first obstacles are bushes which contain the Thorns of Discontent. Kai decides to take one of lay back and not attack which earns a look from the rest of the Ninja and Okino. Kai then says that he only has one life and cannot take any hits.
Okino and the Ninja eventually reach a point where he thinks the upcoming obstacle could be Strangler Vines. Lloyd finds out it's not, but they are ambushed by the Whack Rats. The Ninja defeat the Whack Rats and Ritchie is tied up. They interrogate him and Ritchie reveals that Unagami ordered them to ambush the Ninja. Lloyd then comments about Unagami preventing the Ninja from winning the game which confuses Okino. The Ninja then explain that Prime Empire is not a real-world and Unagami is the creator of the world. Originally, Okino doesn't believe it causing Jay thinks he is not programmed to understand the truth.
Realizing Unagami is playing dirty, the Ninja are about to leave, but Ritchie urges the Ninja to cut him down because he has an itch. Ritchie then tells the Ninja that there's a glitch in the game that can allow the Ninja to bypass the Forest of Discontent. The Ninja end up letting Ritchie down and he begins scratching his body.
Ritchie guides the Ninja to the glitch and he jumps in. Okino is confused at the sight as the rest of the Ninja enter as well. The Ninja are teleported to a purple cubed room. They walk forward and all of a sudden, the Red Visors appear and begin shooting the Ninja. The Ninja pull out their Prime Controllers to defend themselves as Ritchie looks on before leaving the room. The Ninja begin to lose lives until Okino enters and fights the Red Visors allowing the Ninja a chance to escape. Everyone but Lloyd manages escape because Lloyd wants Okino to come along. Okino decides to stay with Lloyd as he pushes him through the portal.
The Ninja and Okino land outside the Forest of Discontent. Lloyd thanks Okino, but he is kneeling realizing the world he lives in is not real. Okino thinks he's a pawn, but Lloyd downplays the idea as he tells Okino that he made his own decision, not Unagami. Lloyd then tells Okino to trust in himself and in the Ninja as friends and as an ally to help them get past Terra Karana.
Kai begins climbing The Cliffs of Hysteria and taunts the Red Visors for not being able to catch up. As they are climbing, Kai does a backflip and lands on one of the drones. He uses the drone to destroy most of the Red Visors before reaching the top with it. He then listens to one of the Red Visors being interrogated by Lloyd before it dies.
The Ninja and Okino begin dashing through traps and just before Cole asks Okino where to go, Unagami pauses the game to speak with Okino. When the game is unpaused, the Ninja ask again, and Okino once again guides them.
They make it to where the Red Dragon is and the Purple Key-Tana. Jay attempts to steal it when the dragon is sleeping, but the Ninja accidentally awaken it when they save Jay. Nya and the Ninja struggle to attack the Red Dragon until Okino strikes the dragon on its weak spot. The Ninja begin striking that same point until Jay grabs the Key-Tana and takes out the remaining lives.
Jay introduces Terra Technica to the Ninja and they decide to sign up for the Speedway Five-Billion. Unfortunately, they don't have enough credits to enter the race due to Kai spending his credits on a new avatar, and to make matters worse, they are surrounded by Red Visors. Jay fights one of them and is forced to have a weapon upgrade which causes them to need more credits once they are done fighting. They then see an advertisement for a dance competition and decide to enter to obtain more credits.
Jay and Nya begin dancing and rank up points rapidly. This impresses the rest of the Ninja as they didn't realize Jay is an excellent dancer.
Meanwhile, the Red Visors begin to show up, so the Ninja begin fighting them in the background. Eventually, Jay and Nya manage to win the contest, and fans begin rushing the stage to congratulate them. One Red Visors tries to craw his way towards Jay and Nya, but Kai pokes his back and punches his head.
After winning the competition, Jay and Nya cash out their earnings to enter the race. The Ninja then realize they need cars, but Jay claims he knows someone who can lend them cars, so they head out to Scott.
Scott shows the Ninja all of the vehicles he has and commented that he wouldn't race due to having only one life left. Jay replies by saying that some things are worth fighting for, but Scott doesn't want to be a hero. Jay then explains that Scott has been in the game for way too long.
While Lloyd heads out to check out the track, the rest of the Ninja begin making repairs to their vehicles. While Nya is working on her car, she falls and Jay checks to see if she's okay. Nya then gets upset that her vehicle is now destroyed, but Lloyd comes back telling the team that he thinks Racer Seven can drive. However, Scott reveals that Racer Seven is programmed to lose which gets affection from Jay and Nya. Lloyd then goes out to find her.
After a grueling day, the Ninja rebuild four vehicles but still need another one. That's when Racer Seven arrives, so the Ninja and Scott come out to greet her. Lloyd then asks if she will participate or not.
While the Ninja are talking to Racer Seven, the alarm sounds as Red Visors begin shooting the base. Lloyd said he would hold them off, but the Ninja won't let him, so Scott decides to hold off the Red Visors. The Ninja manage to escape, but Jay cries out when Scott is cubed.The Nina enter the race and the race goes on, more and more racers get eliminated. Jay pulls upfront, he gets side to side with Richie. They both recognize each other and Richie throws a bomb at him. Luckily, Jay ducks down in time for it to go over his jet and hit another competitor, sending it flying back and hitting other race vehicles as well.
Knowing that their friends stand a better chance of winning than them, the Kai and Cole exchange knowing nods. Kai's mech jumps on a Red Visors' car and Cole throws his wrecking ball at two other Red Visors' cars, one being the one he hit with the wrecking ball with and the other he snagged while dragging the other car back. As all the vehicles are about to collide, Kai and Cole wish their friends good luck. A giant explosion occurs and everyone is shocked when two energy cubes fall to the track. Jay and Nya scream for their friends while Lloyd hangs his head down in despair while Unagami's drones pick up the cubes.
Typically preferring red attire, Kai has tall, thick spiky brown hair, shaped like fire, similar to his hair in The LEGO Ninjago Movie. He is often seen with a focused expression on his face, with a scar visible on his right eyebrow and bandage above his left. Before Season 8, his hair was a slightly darker shade of brown, his eyebrows were black, his bangs parted to the right and instead of a scar, he had a notch on his left eyebrow. However, he has a scar below his eye in the LEGO sets released prior to Season 8.
In "Way of the Ninja" and "Endings," Kai wore a white shirt and red pants as well as an orange apron. Since "The Royal Blacksmiths," Kai's civilian attire consists of a red half zipped up sweater over a maroon shirt with his symbol on the chest and brown pants. Throughout Season 6, he wore a red cap over his hair to conceal his identity. In the pilot and The New Masters of Spinjitzu, it can be observed that Kai has chest hair
while wearing pajamas, but in later appearances where his chest is visible, including the appearance of his past self while time travelling to the events of the pilot, the hair is no longer there.
In an anime scene of "The Absolute Worst," Kai's eyes appear to be brown.
In Prime Empire, Kai's avatar makes him look different from how he looks now. His hair is now blonde and he has red paint over his eyes, similar to Harumi. He also has a red square print that is half hidden on his chest.
For more images on Kai's appearance in his different Ninja suits, click here.
Like the majority of his fellow Ninja, Kai is currently in his late teens. However, the Ninja do not officially have specific ages, as they are meant to be perpetually in their teenage years for the duration of the show.
Potential Estimations: During the events of the pilot and Season 1, he may have been at least 15 or 16 years of age. As the most recent events take place three to four years after the events of Season 2, he could possibly be around 18 or 19.
- Main article: Kai (Relationships)
Kai is the former leader of the Ninja team along with Cole before Lloyd took over. He and Cole would often alternate between and share the leadership. Fittingly for his elemental affinity, Kai is very hotheaded, prone to taking action before he thinks things through. He is capable of making careful observations when the need arises, but his emotions often override his caution. His single-mindedness made interaction with his teammates difficult at first (especially due to his worry about Nya), but he eventually learned to work with the other Ninja. He can be very cocky at times, sometimes even to the point of selfishness, insisting that he is better than others, gloating about his victory, or yelling about his failures.
Later, following the Ninjas' fame, Kai would end up getting something of a larger head and bigger ego, constantly flirting with girls and enjoying the merchandise styled after him. Likewise, he indulged in his fame the most out of all of the Ninja.
Kai also has something of an overconfident stubborn side, believing that he is in the right until overwhelming evidence to the contrary is presented. This is especially pronounced during Lord Garmadon's stay on the Destiny's Bounty; Kai repeatedly accused the four-armed villain of treachery or plotting despite Garmadon's insistence that saving Lloyd was his primary concern at the time. On the other hand, Kai's stubborn streak lends him incredible determination that allows him to bolster the team's spirit in the face of impossible odds.
Overall, Kai is tough, brave, confident, passionate ninja. The most prevalent facet of Kai's personality is his good heart and dedication to people he cares about—if someone can earn his friendship, he will stop at nothing to protect them. Much of his stubbornness and recklessness are due to his desire to help his loved ones, either directly or by becoming strong enough to defeat anyone who might threaten them with their plans. In turn, his friends and family work to balance out Kai's more extreme traits, causing him to become a levelheaded mentor for Lloyd by the time he and his comrades begin training the Green Ninja. According to Zane, Kai's desire to protect his friends is just as powerful as his temper.
Abilities and Weapons
Being the Elemental Master of Fire, Kai can create Fire with his own hands and either throw them, use them as boxing gloves via pyro-enhanced combat, or make a huge spread of Fire at his opponent. It is also shown that he can withstand high temperatures and walk through fire unharmed. He also has to ability to move fire at will.
Kai favors swords in combat, taking up a curved silver blade against the Skulkin when they attacked his shop. He used the Sword of Fire as his primary weapon until it was lost, and then switched to wielding regular katanas. He eventually gained an Elemental Blade that allowed him to harness his fire abilities to an even greater degree. Months after Lloyd defeated the Overlord, Kai, along with the other three Ninja (Cole, Jay, and Zane), receive Techno Blades, a weapon which allows the Ninja to hack into any electronics. He also has an Aeroblade (along with Cole, Jay and Zane), that can destroy ghosts.
In the Tournament App
Kai is a playable character in the Tournament App. His teacher version can be purchased for 50,000 studs, his jungle version can be purchase for 250,000 studs, and his special move is Spinjitzu, much like Jay, Cole, Zane, Master Wu, and Master Garmadon.
Kai has owned a variety of different vehicles in his Ninja history.
- Fire Dragon
- Elemental Fire Dragon
- Blade Cycle
- Kai's Bike
- X-1 Ninja Charger
- Katana 4x4
- Fire Mech
- Mech Jet
- This will be used in Season 12: Prime Empire.
- It is also considered a jet since it can transition between both forms.
- Katana V11
- Kai Fighter
- Mech Jet
- This will be used in Season 12: Prime Empire.
- It is also considered a mech since it can transition between both forms.
Kai is the ninja of Fire, and though he is a hero now, he came from humble beginnings. His father was a trusted ally of Sensei Wu and the two adventured together for many years. Wu would later hide the map showing the locations of the Four Weapons of Spinjitzu in his friend’s blacksmith shop. Kai was the last member recruited for the team by Sensei Wu and the last to achieve his full potential (which happened when he saved Lloyd from the belly of an active volcano!) He can be hot-headed and impatient, but is trying to control that.
- For the first two months of his life his parents called him Ash.
- Kai once by accident forged a weapon called a 'Swingana' … Part yo-yo, part sword. It was not a big success.
- When Kai uses his elemental power in a vehicle, it gets powered up and engulfed in flames … which is why flying a hang glider is a bad idea.
- Once Kai singed off his eyebrows with the sword of fire, but no one noticed because he painted it back on with a black marker.
- When Kai's sister, Nya, was a baby, he used to juggle hammers to entertain her. When he dropped one on his foot, she laughed the hardest.
Pilot (2017 Museum gallery)
Kai’s impulsive personality, fierce temper and immense drive mirror the fire within him. His strong sense of justice makes him stubborn and he’ll stop at nothing if he has put his mind to it … but this is also the source of his bravery. As older brother to Nya, he is overprotective of her. While Kai’s self-confidence can be overwhelming to some people, this makes him one of the leaders and big personalities in the group.
Kai is the last young ninja to join Master Wu’s ninja training. His impatience with training is significant, as Lord Garmadon has kidnapped his sister. However, while he quickly becomes a skillful warrior and is the first to tame his dragon, he discovers that impatience is the enemy of a great ninja…
Season 1 (2017 Museum gallery)
When the prophecy of the Green Ninja is revealed, Kai is absolutely convinced that he will be the Chosen One and defeat Lord Garmadon in the final battle. In the end, Kai has to put his ego to one side. He discovers that life has a different plan for him and there are more important things than being the best.
Season 2 (2017 Museum gallery)
Once the self-centered rogue, Kai becomes the ultimate team player. He humbly and proudly accepts his role as Lloyd’s mentor, helping the Green Ninja find his true potential. Finally he becomes the hero he’s always wanted to be, willing to give up his own life for the team.
Season 3 (2017 Museum gallery)
Kai feels a little like the world has passed him by. While everyone else is going high-tech, he can’t even use a toaster without setting off fire alarms. He feels like machinery is out to get him, but as time goes on during this adventure, he learns to find a balance between the past and the future.
Season 4 (2017 Museum gallery)
Kai is competitive by nature and Master Chen plans to use that against him. Kai’s always been second to the Green Ninja, but maybe this tournament is his chance to prove how good he really is. Is Kai willing to leave his team behind, only to get ahead? What could compel him to follow his ego...a potential love interest, perhaps?
Season 5 (2017 Museum gallery)
After the loss of Garmadon, Kai made a solemn promise to look after Lloyd, just as Nya cared for him when their parents passed away. So when Lloyd is possessed, Kai takes it very personally! He feels he has to save him single-handedly, but really he needs the whole team. They all have weaknesses, but their individual strengths come together to win the day.
Season 6 (2017 Museum gallery)
Kai loves being a celebrity. He loves being an action figure, he loves the screams of the fans, and all this crazy ninja stuff is kind of getting in the way. He’s not ready for the threat of Nadakhan or to confront his own past, which endangers the team. Like the other ninja he is given three wishes by the Djinn which don’t go to plan. He ends up trapping himself in Nadakhan’s Djinn Blade and only escapes in time to crash Nya’s wedding.
Season 7 (2017 Museum gallery)
Kai has long wondered what happened to his parents, who disappeared when he was a child. All he knew is that they were Elemental Masters, which is why he is devastated when Krux tells him his parents helped the Hands of Time betray Wu and the Elemental Alliance. Always a fighter for justice, Kai now fears he is destined to follow in his mother and father’s traitorous footsteps, and his quest for the truth ultimately leads to an angry confrontation with his father, Ray. Fortunately, Kai learns that Krux had lied, and Kai (and Nya) save Ray from the effects of a Time Punch.
Kai’s impulsive personality, fierce temper and immense drive mirror the fire within him. His strong sense of justice makes him stubborn and he’ll stop at nothing if he has put his mind to it … but this is also the source of his bravery. As older brother to Nya, he is overprotective of her. While Kai’s self-confidence can be overwhelming to some people, this makes him one of the leaders and big personalities in the group.
2019 (The Legacy of Kai)
Did you know Kai is the Fire Ninja through and through. He can be impulsive, has a fierce temper, and his strong sense of justice can make him stubborn at times. But his fire is also the source of his bravery and strong loyalty. He will stop at nothing if he has put his mind to a cause or mission. He can be very overprotective with his younger sister, Nya. Kai’s self-confidence can seem a little overwhelming to some people, but his friends know he has the skills to back it up. They trust him with their lives and will follow him everywhere he goes. Favorite NINJAGO® Legacy weapon The Sword of Fire – one of the four Golden Weapons and Kai’s trusty battle companion through thick and thin. Quote “Crime doesn’t pay muchacho. You can take that to the bank.”
Kai - the fiercely determined Fire Ninja!
Self confident, impulisive, determined and brave - Kai is a strong character among the LEGO® NINJAGO® Ninja heroes. If he puts his mind to something he will not stop until he has achieved his aim. That stubborn streak might get Kai in trouble sometimes, but his strong sense of justice is always to be admired.
Kai and his younger sister Nya worked in their father’s blacksmith shop until Master Wu took them under his wing and trained them up to be part of an awesome ninja team. With Wu’s guidance, Kai learned the art of Spinjitzu and how to harness the fire burning inside him to become an Elemental Master of Fire, following in the footsteps of his father who, unbeknown to Kai, had been the previous Elemental Master of Fire (Nya inherited their mother’s elemental mastery of water).
A massive personality in the ninja team, Kai is a hugely popular character with NINJAGO fans who love to role-play with his red-outfitted minifigure, found in many LEGO NINJAGO construction sets.
Clad in red armor with his trusty sword, Kai is the ninja of fire and one of the leaders of NINJAGO’s team of fighting comrades. He expertly guides them with his sense of justice and inherent bravery.
Kai finds himself in a peculiar position when he is "elected" leader of a race of subterranean creatures called the Geckles. And the Geckles are even more hotheaded than Kai! They are embroiled in a war with another subterranean race called the Munce, whom they believe have stolen their most precious cultural relic – a mystical sword called the Ivory Blade of Deliverance. Kai finds himself caught in the middle, forced to be the voice of reason when he must broker a peace between them and unite both sides against their true enemy – the Skull Sorcerer.
- Before Lloyd, Kai was the main character of the show, and could still be considered the "main character."
- In Season 10, Kai made a big impact as he was Ninjago's last hope on defeating the Oni. In order to forge the Golden Weapons, Kai was forced to use his fire to melt down the Golden Armor. This could tie in on him being Ninjago's main character before Lloyd.
- Kai and Nya’s surname is unknown.
- In the whole series, Kai is the only Ninja and protagonist who has never defeated a main antagonist alone.
- Kai is the only Ninja minifigure who's had one head print throughout the majority of the series, at least until season 8. Except for his Stone Armor variant, which was released as an exclusive small set, his Golden Ninja variant, which was released in a Bricktober pack, and his fusion armor variant, all of his minifigures have featured him with a scarred face. However, the Stone Armor minifigure includes Kai's show-accurate head without the scar, and in the Dragon's Forge set, Kai has two brand new face prints, one has a confident smirk and the other has a angry face expression with orange glowing eyes representing him using one of the Time Blades. In addition, his Golden Ninja variant had a big, toothy smile on it.
- The name, Kai, means "strong," "victorious," and "recovery," in three Asian cultures, all of which fit his hotshot attitude in the Ninjas' battles. His name may also be derived from the Japanese word Akai, meaning "red."
- In Scottish, Kai's name means "fire"; matching his elemental power.
- In Japanese, Kai's name also means "ocean," which annotates his mother's water abilities.
- Kai is the fourth Ninja to join the team, the last of the original four to claim his Golden Weapon, the fourth Ninja to unlock his True Potential, and the third to last to have a love interest. On the other hand, he was the first Ninja introduced in the series, the first to tame his respective dragon and the first Ninja to perform Airjitzu.
- He cannot skate, as seen in "Ninja Roll."
- It is presumed that he likes spicy food, because it was said that he likes everything hot in non-canon media.
- He appears to have a fear of Christmas-related themes, as shown in "Can of Worms," when the Venomari's venom causes him to see things like Santa Caus, gingerbread men and elves.
- Since "The Invitation," Kai's had feelings for Skylor, which she initially used against him until she began to genuinely return them. In Season 7, it is shown he visits her, making it possible they are currently still seeing each other.
- In "Green Destiny," he was by her side when she woke up after Garmadon lost his power. Later on, they held hands at the end of the episode, starting their relationship.
- Kai and Nya's parents were the previous Elemental Master of Fire and the previous Elemental Master of Water, Ray and Maya.
- He inherited the elemental powers of his father, and Nya inherited her mother's.
- Kai is mentioned to be aquaphobic during "Stiix and Stones," or have an extreme fear of water. It is ironic, then, that his sister turned out to be the Elemental Master of Water. However this seems to have caused an inconsistency, since in Season 2 he wasn't afraid of water when attempting to reach Ninjago City by the ocean from the Dark Island.
- Ironically, in Hawaiian, Kai's name means "ocean" or "ocean water."
- Kai's official minifigure has scars on his face. In the show, Kai doesn't possess these scars.
- To mirror his movie self's appearance, he now has his scar on the right side of his face as of Season 8.
- He considers Lloyd to be like a younger brother. As of Season 5, Kai also becomes somewhat of a guidance figure to Lloyd. This bond between the Red and Green Ninja can be traced to that of the same colors in Chinese mythology and culture.
- Kai's elemental symbol is the Chinese character "平," meaning "flat" or "peaceful."
- Kai appears to holster the Sword of Fire as if he was left handed, but uses all other weaponry and tools in his right hand; this might mean Kai is ambidextrous. It's confirmed by the season 8 because Kai use two katanas in this season.
- Kai has been the focus character of the most seasons (three) as well as the Pilot episodes and Mini-Movies.
- Kai and the other Ninja (except Nya) can only harness their Elemental Powers by being dependent on Lloyd. This may be because Lloyd shares his Golden Power with them.
- In Season 8, Lloyd loses his powers however, Kai and the other Ninja retain theirs.
- This could mean that they have become more adept at using their powers without Lloyd and do not need to rely on him anymore to use them.
- Names Kai originally had were Dante and Ash.
- Ironically, another character similar to Kai ended up using the name Ash.
- Also, in concepts, Kai had red hair and freckles.
- Kai says he hates technology but can be seen enjoying video games and using his phone to send Chirps. His dislike may have been because he wasn't used to it growing up as a child. He may have learned to adapt.
- He may be similar to Krux since both have a hatred for technology.
- Kai and Cole led the team in the earlier seasons prior to Lloyd becoming the leader.
- Kai is one of the leaders in the group along with Lloyd and Cole 
- Kai is not as good of a blacksmith as Nya, because he is less patient.
- It seems that Kai's favorite Ninja suit is the original, for when he went to the Tournament of Elements, that is the suit he chose to wear.
- When he was younger, he had freckles.
- According to Tommy Andreasen, Kai uses hair gel to maintain his appearance.
- Kai's physical minifigure prior to Season 8: Sons of Garmadon had a rubber hairpiece. It was not completely show-accurate, as in the show his hair is thinner, and slightly longer in the back.
- In Shadow of Ronin, Kai’s hair looks exactly the same as the rubber hairpiece he dons in the sets. It is in a lighter shade of brown.
- Kai seems to have a large ego as he wanted to be the Green Ninja and lead the team.
- He are Zane are currently the only Ninja to have their Golden Techno Robe variant as a physical minifigure.
- The Golden Techno Robe Kai figure is in the Ninjago Toys "R" Us Bricktober pack for 2017.
- While Kai wasn't experienced with the Staff of Elements which got him corrupted, he was wise at using the Elements against Chen's army.
- After Kai and Nya's parents were kidnapped by Krux, a babysitter named Mrs. Grumbmiller was hired to take care of them, but Kai and Nya would call her Madam Revenge because she made them go to bed early.
- Kai is the second Ninja to solely lose their powers due to someone absorbing them, the first being Lloyd.
- The Ice Fishers called him "Fire Maker."
- Kai has been the mascot of the most Ninjago waves, being the mascot of the Pilot, Season 4, Season 7, Legacy, and Season 11.
- The rest of Kai's scar below his eye is missing in Season 11. Tommy Andreasen pointed out that they didn't notice it until it was too late. It will reappear again in future seasons.
- He appeared as a Minecraft skin in the set 21160 The Illager Raid from LEGO Minecraft.
- Kai is the only character to appear in all Ninjago: Legacy Wave 3 sets.
- Kai is the only one out of the ninja who has an avatar in Season 12: Prime Empire that doesn't have triangle markings on his avatar body.
- Main article: Kai/Gallery
- ↑ https://twitter.com/TommyAndreasen/status/800279588173676549
- ↑ https://twitter.com/TommyAndreasen/status/942371358138421248
- ↑ https://twitter.com/brothershageman/status/909594849862492160
- ↑ https://youtu.be/2kMWaHNh9Gw?t=644
- ↑ https://twitter.com/TommyAndreasen/status/780896469381328896
- ↑ https://twitter.com/TommyAndreasen/status/779422700230115328
- ↑ https://twitter.com/TommyAndreasen/status/771438164170924032
- ↑ https://www.lego.com/en-us/kids/characters/ninjago/kai-eec9471c9daa4ec9a735fd748c52d428
- ↑ https://twitter.com/TommyAndreasen/status/972364767733125120
- ↑ https://twitter.com/TommyAndreasen/status/1180111467732967424
- ↑ https://twitter.com/TommyAndreasen/status/1180164177874345985