On "Day of the Departed," at the destroyed monastery, Wu paid tribute to his father as a sign of respect.
During "The Gilded Path," Wu has a dream about his childhood where his father taught him and his brother to have patience and faith. Wu used the lesson as inspiration to lead the Ninja and Faith to the Dragon Armor.
When Baron tried to betray him, Wu revealed that he knew his father’s pure heart is what allowed him to befriend Firstbourne and knew he didn’t have to rely on armor.
|“Long ago, when I was a young boy, Garmadon and I were more than brothers. We were the best of friends.”|
“Wait a minute. Now, I know you two were brothers, but really? The King of Cruelty, the Doer of Destruction, the Captain of Chaos, and you two were friends?”
|— Wu and Jay|
They remained close, however, and though Wu didn't heed Garmadon's warning against entering Serpentine territory or trusting Aspheera, his brother was still willing to help him defeat her once she revealed her true intentions. The two remained a force against evil for countless years following the death of their father. The two brothers fought together in the Serpentine War and in fighting the Time Twins. After Garmadon finally succumbed to the Devourer's venom, he attempted to steal the Golden Weapons, and the two brothers came to blows, which ended in Garmadon being defeated and banished to the Underworld. Years later, Wu assembled a team of Ninja to fight against him and his Skeleton Army.
After Garmadon was purified of his evil, he reconnected with his younger brother, and they were both fighting side by side once again, as the Ninjas' masters for a short time.
Once Chen told had Wu of Garmadon's past actions, Wu was infuriated at his brother's actions and declared him unworthy of being a master until Skylor put a stop to it. After that Wu was silently hostile to his brother not bothering to speak to him at the cave, as Garmadon was sad at losing both him and Misako.
However, it appears that Wu had forgiven his brother as he quickly spoke against the latter's thoughts of banishing himself to the Cursed Realm to defeat Chen. This seemed to be the case as he proudly called Garmadon Lloyd's master, showing he had taken back his earlier statement that his brother was no master.
When Garmadon was resurrected by Harumi, a de-aged Wu sensed his brother approaching to destroy him and was shaken enough to alert Misako.
During "The Gilded Path," Wu has a dream about his childhood where his father taught him and his brother to have patience and faith. Wu recalled his brother being frustrated at his success. Wu also wanted to return to Ninjago where he hoped to free it from Garmadon's tyrannical rule.During "Green Destiny," Wu returned to Ninjago, and Garmadon sensed him, realizing he was alive. Wu confronted his brother with Lloyd, and they fight as Garmadon declares them as his enemies. Wu tried to talk sense into him, to stop his madness but Garmadon mocked Wu by saying that just because he has their father's sword does not mean he is their father's equal. Despite this, however, Garmadon did not bother to finish off Wu, instead of continuing to engage Lloyd.
They later reunited to face the Oni and parted ways on a good note after the conflict.
During Season 7, Lloyd and his friends came to Wu's aid when he fought Acronix and was distraught as Wu was wounded by the villain. In "Scavengers," Lloyd was sad that may have failed his uncle when he needed help fighting Acronix, and Lloyd wanted to make sure he doesn't fail him again, so he looked after him when he was injured and continued to work harder in his training to become a master. When Lloyd infiltrated the Time Twins' base, he went out of his way to save the captive Wu but lost him to the Vermillion. When Wu was lost in time with the Time Twins, the Ninja made Lloyd their master and he said his first order as their master was to get rid of the time blade and find out where Wu was.
During Season 8, they were unknowingly reunited when Wu came back as a baby. Lloyd was unaware of this until Harumi betrayed him and revealed this fact to him, and he couldn't believe that his uncle was the infant the whole time. After he reunited with his friends, Lloyd spent more time with the de-aged Wu and wondered when he would return to normal.
When a resurrected Garmadon attacked the city, Lloyd protected his infant uncle from harm and refused to let Harumi take him. Despite Lloyd's actions, uncle and nephew would be separated once more after the Ninja and Wu are sent to another realm. Lloyd was unaware of this and believes his uncle is dead along with his friends.
However, Lloyd later learned the truth of his uncle's status from Mistaké and was happy to hear he was alright.
In "Green Destiny," Wu is reunited with his nephew and quickly comes to rescue by fighting off the Sons of Garmadon with the Ninjas' aid. Lloyd was amazed that Wu was almost back to normal but is still in his right mind. Wu even assured him that he still had him without his powers and helped his student in fighting his father before he was forced out of the fight. Wu was later happy to see Lloyd has regained his powers and defeated Garmadon in battle. In the end, Wu became an old man again and acknowledged Lloyd as a fellow master once peace was restored.
Love InterestGarmadon. Wu did not object to their union, despite his heavy feelings for her and accepted Misako's choice as well her into the family.
They met again after Garmadon's evil fully corrupted him, the two get along very well and often share jokes as Misako once remarked she should have married Wu while dealing with Garmadon's evil. While it looked like they would be a couple again, Misako's love for Garmadon was maintained and she along with Lloyd reconnected with him as Wu was happy to see them as a family again.
It is revealed in Spellbound, that in his youth Wu had written Misako a love letter but Chen had intercepted it and had Garmadon (who felt the same) write his name on it, which caused her to fall in love with him. The two were unaware of this act until Chen revealed it and they were devastated by this news and angry at Garmadon for committing the act. They got closer in that time but both showed that they still loved Garmadon as they were against his choice of banishing himself to the Cursed Realm.
Following the Second Serpentine War and Garmadon's sacrifice, the two had officially became a couple to make up for the years lost due to Garmadon's deception. They are often paired up and closer than before with occasional smiles and intimate talks between them on missions. During Season 7, when faced with a nightmare revealing his greatest failures, Wu showed that he still regretted not telling Misako his feelings more directly before she went to his brother instead.
In Season 8, it is revealed by Lloyd that Misako had gone off to find Wu (after he was lost in time) at some point in the year between seasons. In "Dread on Arrival," it is mentioned by Harumi that Misako was successful in locating him before they were captured by the Sons of Garmadon.
It is unknown if they are still together after the subsequent separation and Garmadon's revival.
|“You are all my prized pupils, but none of us can do this alone. You're strong, Morro, but it takes others to make us stronger. Even me.”|
|— Master Wu|
However, this was not the case as Morro would become more arrogant at the opportunity to have such amazing power. Wu soon saw the true depths of his error in judgment as the Golden Weapons did not choose him, meaning that he was not the chosen one. Wu tried to comfort him but Morro set out to prove destiny and his master wrong, this proved to be a fatal mistake as he would die on his journey, much to Wu's sadness.
Morro later came back to Wu as a Ghost and possessed the true Green Ninja Lloyd who was also Wu's nephew. The two became enemies with them clashing in their encounters with Morro blaming his old master for his fate and Wu defending his choices. Despite this, Wu tried to save Morro from death after the Preeminent started to drag him down into the water. However, Morro saw the error of his ways and simply resigned himself to his fate but not before giving Wu the Realm Crystal and bidding him farewell. Wu was very devastated at seeing his pupil die having a sad look on his face.
In "Day of the Departed," Morro is resurrected and meets his old master at the ruins of the monastery. Wu was shocked to see him again but told him that while he was pained they would have to fight again, he won't hesitate to do it again. However, he was shocked to hear that Morro had no intention of fighting him but came to warn him about Yang's plans. Wu later defended Morro from being attacked by the Ninja and told them Morro came to help as the latter told the Ninja of what Yang was planning. As Wu had the Ninja go stop the evil master, he thanked Morro for his actions as his redeemed pupil bid him farewell and returned to the Departed Realm.
Despite making peace with his fallen pupil, it is shown in Season 7 that Wu is still haunted by guilt and reminded of the path his former student went down as he had nightmares about Morro blaming him for his fate.
|“I came for something greater—you. Since my brother cannot enter this realm, it's obvious he has struck a deal with Samukai. If he were to collect all four weapons, even I would not be able to stop him again. But you! You have the fire inside. I will train you to harness it. Use it. Become a Spinjitzu Master.”|
In Season 7, he and the other Ninja come to his aid when he fights Acronix by himself when Nya saves Wu from succumbing to the effects of the time blades. with Wu back to normal, he helps them foil the time twins plan. He later aids Kai and Nya in the battle against the Time Twins but when the villains prepare to finish the Ninja off, Wu sacrifices himself to save them. Though happy at their victory, Kai couldn't help but be worried when his master was feared lost in time with their enemies. He and the Ninja elect Lloyd as their master and are happy to hear his first order is to discover what happened to Wu.
In Season 8, Kai and the others are still searching for Wu before dealing with the Sons of Garmadon. They find an infant and after said child starts to walk and talk, they realize he is in fact their master de-aged because of the time blades.
During Season 9, while they are stranded in the Realm of Oni and Dragons Kai is the Ninja who is amazed at Wu returning to normal and the thought of teaching him his old lessons to better help him. Kai was relieved to see him become himself again. After his master rapidly aged into an adult and regain his memories, Kai was excited to see he was back.
In "Green Destiny," Kai and Wu fought against Garmadon's forces and were victorious in the conflict.
During Season 11, Kai criticized his master after hearing of his past in teaching Aspheera the way of Spinjitzu and causing him to lose his powers to her and gave him the cold shoulder. Despite that, Kai refused to let him sacrifice himself to her, just to protect him and the others.
Like the other Ninja, Wu sees Cole as one of his best students.
Following Wu's sacrifice to defeat the Time Twins, Cole and the others were devastated by his loss and made plans to find their lost master. Cole was the most devastated by the loss of his master.
In Season 8, Cole and the others are still searching for Wu before dealing with the Sons of Garmadon. Cole finds an infant and brings him back to his friends, after said child starts to walk and talk, they realize he is, in fact, their master de-aged because of the time blades.
During Season 9, while they are stranded in the Realm of Oni and Dragons Cole acts as the Ninja who mostly teaches Wu his old lessons to better help him. Cole was later relieved to see his master aged into an adult and regain his memories.
|“Zane was innocent. He had no part in this. He was one of the kindest, bravest souls I have ever known.”|
Wu was devastated by Zane's presumed death but stated Zane sacrificed himself for the greater good as he protected his friends.
In Season 4, when Zane was restored and came back to Ninjago with the other Ninja, Wu was happy to see his pupil alive again and complimented him on his new form after reuniting with him.
In Season 8, Zane and the others are still searching for Wu before dealing with the Sons of Garmadon. It is also revealed that the two already met forty years ago, Wu had searched for Elemental Master of Ice but discovered that the latter had passed his powers to Zane. He was interested in Zane's habits and told Zane that he might call upon for something in the near future. Zane couldn't recall this as Julien wiped his memory before his first death.
The Ninja later find an infant and after said child starts to do strange things, the others deduce he is Wu. After Nya came up with a theory for their master de-aged because of the time blades, Zane believed it was a matter of time until he returned to normal.
During Season 9, while they are stranded in the Realm of Oni and Dragons Zane is the Ninja who notes of Wu's aging and with the others tries to teach him his old lessons to better help him. Zane was later relieved to see his master aged into an adult and regain his memories.
In "Green Destiny," Zane and Wu fought against Garmadon's forces and were victorious in the conflict.
During Season 11, Zane took a blow from Aspheera to protect Wu from her. Wu was devastated to see Zane being lost again. When Wu later visited Aspheera while she was imprisoned, he expressed disgust at her actions on Zane but she revealed that she really banished Zane to the Never-Realm. Wu was greatly distress with his pupil's fate while Aspheera laughed at how he could never get him back.
In "A Cold Goodbye", it is shown that Wu cares for Zane a lot as he tries to go to the Never-Realm alone, but is forced to watch his students leave to rescue him. What he doesn't know, is that during the decades stuck in the Never-Realm, as opposed to days in Ninjago, Zane lost him memory while becoming the Ice Emperor and did horrible things while under the corruptive influence of the Scroll of Forbidden Spinjitzu.
Like the other Ninja, Jay respect Wu who in turn views him as he expressed concern for the latter when he was attacked by Acronix and began to rapidly age due to the effects of the time blade. Along with the Ninja, Jay wanted to find his master after he was lost in time with the Time Twins.
In Season 8, Jay and the others are still searching for Wu before dealing with the Sons of Garmadon. They find an infant and after said child starts to walk and talk, as a shocked Jay is the first to realize the baby is in fact their master de-aged.
During Season 9, while they are stranded in the Realm of Oni and Dragons Jay is the Ninja who is amused at the thought of trying to teach Wu his old lessons to better help him as he rapidly ages. Wu was also put off by Jay's acceptance of being stranded but was relieved to see him become himself again. After master rapidly aged into an adult and regain his memories, Jay was excited to see he was back.
In "Green Destiny," Jay and Wu fought against Garmadon's forces and were victorious in the conflict.
|“As Kai took on the traits of your father to become a Fire Ninja, for the sake of saving Ninjago, you must train to become the Master of Water.”|
In Season 5, Wu informed a surprised Nya that she was the elemental master of water and started to train her in the usage of her power to become a Ninja. Nya is now one of Wu's students along with her brother Kai.
In Season 7, she and the other Ninja come to his aid when he fights Acronix by himself. She later saves Wu from succumbing to the effects of the time blades with Wu back to normal, he helps them foil the time twins plan. He later aids Kai and Nya battle the Time Twins but when the villains prepare to finish the two Ninja off, Wu sacrifices himself to save them. Though happy at their victory, Nya couldn't help but be worried when her master is feared lost in time with their enemies.
In Season 8, Nya and the others are still searching for Wu before dealing with the Sons of Garmadon. They find an infant and after said child starts to do strange things, the others deduce that he is actually Wu and inform Nya of this. Nya doesn't believe it to actually be him, though she realizes that is indeed Wu after hearing the baby talk and drink tea the same way her master does. She was the Ninja who came up with a theory for how he de-aged because of the time blades. The pair are separated the season 8 finale and Nya was under the impression that he was dead until she realized otherwise in Season 9.
In "Green Destiny," Wu is reunited with his pupil and saves her and Lloyd from their enemies. Nya was amazed to see that Wu was almost back to normal but is still in his right mind. In the end, she is relieved to see him back as an old man again once peace is restored.
|“I learned something from you. Never to trust a snake.”|
For his supposed betrayal, Aspheera has gained a dislike for him and wanted to exact revenge on him. To this end, she plunged all of Ninjago in disaster and told them to bring the "traitorous deceiver" to her. Wu also revealed to the Ninja, that his befriending Aspheera was his greatest mistake.
When they finally met again, she voiced on how she dreamed of confronting him and was nearly successful but thanks to the interference of the ninja Aspheera was defeated though at the cost of Zane.
In "Vengeance is Mine!," Wu visited her while she was imprisoned, where he expressed disgust at her actions but she revealed that she never sought to destroy him but make him feel her pain by banishing him to the Never-Realm as she did Zane. Despite not banishing Wu, Aspheera took pleasure in knowing that she caused him great distress with his pupil's fate and laughed at how he could never get him back.
When returning to Ninjago in "Green Destiny," Wu inquired on her and was sad to hear she had fallen in battle.
Wu was aware that the Dragon only befriended his father because she sensed good in his heart. Wu watched as Firstbourne incapacitate Iron Baron before she looked upon him. Firstbourne felt the same feeling in Wu, as it did in his master and allowed him the privilege of riding her. With the mother of Dragons helping, Wu and his pupils were able to return to Ninjago City. Firstbourne helped Wu in overcoming the Sons of Garmadon and his brother.
The two first met in Season 3 but there wasn’t much interaction between them or future seasons.
During "The Kaiju Protocol," she and Wu try to open a portal to the Never-Realm to retrieve the Ninja. However their actions end up releasing the Preeminent, which proceeds to attack the city. While P.I.X.A.L goes to stop the creature, Wu stays behind to open a portal to the Departed Realm. When she is overwhelmed by the beast she was also using drastic measures, as Wu tries to warn her of the danger of what could happen but after she defeats the creature he is a relieved. The pair then proceed to regain hope on rescuing the Ninja.
|“As you said, Acronix, it ends now.”|
|— Wu to the Time Twins|
After being cured by his students, Wu got his revenge on the twins by confronting them with his students. The twins were greatly shocked by his return and fought him again. When Wu saw the aftermath of the villains' actions on his friend Ray and nearly watched them kill Kai and Nya, he decided to finally put an end to them by sabotaging the Iron Doom. Wu's act greatly shocked and infuriated the twins, as he chose to stay behind to finally end their conflict.
Wu then fought both of his foes for the last time and presumably defeated them, avenging the actions done onto him and his friends by their hands. Wu also had no qualms in leaving the Time Twins behind in the vortex and they are currently still lost in time.
Wu and Samukai came into conflict years ago, though Wu along with his brother Garmadon defeated the skeleton warrior.
Wu met Samukai again in "Weapons of Destiny," where he challenged his old foe to a final rematch, with Master Wu armed with the Sword of Fire while he himself wielded the remaining Golden Weapons. Despite Wu's best efforts, Samukai ultimately reigned victorious and proceeded to claim the Sword of Fire, even as the ninja arrived to witness Garmadon's triumph. Fortunately, Samukai's wielding of the Golden Weapons caused the latter to explode.
|“You taught me the power of lies. You didn't really think the Dragon Armor is what made Firstbourne obey my father, did you? It was because of his heart. She sensed goodness in him. What does she sense in you?”|
When they met face to face, Baron wasted no time in attacking Wu but Faith saved him. Baron then discovered that Wu was the son of the First Spinjitzu Master, he was very shocked and focused his entire hunt to capture Wu instead since the latter was quarter Oni.
Wu was later captured by Baron along with the Ninja after they tried to save Faith. He broke free and fought Baron and his hunters but the latter offered him a deal to locate the Dragon Armor and he will free the Ninja. Wu agreed to this and led Baron to the path of the item.
Along the journey, Wu was disgusted by Baron's reason of lying to the Hunters, despite that Wu saved him from falling and was met with ungratefulness from him. After they located the armor, Baron revealed he was lying the whole time and ordered the dragons to kill Wu who was not surprised but explained to Baron that he lied as well since the armor did not allow his father to control the Firstbourne, but sensed his good heart. Wu watched as Firstbourne attacked Baron and encased him in molten rock.
Heavy Metal approached the Ninja and confronted them on Wu truly being the son of the First Spinjitzu Master. After he confirmed it, the Dragon Hunter revealed their true name as Faith and allied with them.
During Two Lies, One Truth, they continue their journey but his students say it wasn't okay to lie. She slowly becomes skeptical, as she continues her journey with the Ninja.
In The Weakest Link, when Baron he attacks them and this nearly causes Wu to fall off the rider but Faith saves him and states she won't lose the son of the First Spinjitzu Master. Unfortunately, she ended up captured by Baron.
As of Saving Faith, Wu wanted to liberate her and persuaded the Ninja to save her but they were though Faith did appreciate the offer. She watched Wu escape and fought the hunters, being amazed by his skill. She also warned Wu not to trust Baron after he made a deal but Wu told her to have faith in him.
In "Lessons for a Master," Wu returned to Faith and the ninja, with her in awe at him taming Firstbourne and with the dragon armor. Wu accepted Faith as a new friend and offered her the chance to come to Ninjago but she declined and wished them luck in saving Ninjago.
She meets him again in "The Darkness Comes," to warn them of the impending invasion of the Oni. The old master watched over her as she recovered from her experience.
During "Endings", Wu sees that she is on her feet again and wants to help defeat the Oni. Wu tried to dissuade her but he realized he couldn't stop her. At the end, they defeat their enemies and celebrate their victory.