|“That was a long time ago. And it only happened once. Trust me. We will both find our animal forms and we will run together in the forest all day and night.”|
|— Kataru, to Akita|
Kataru is a Formling who lives in the Never-Realm, and the older twin brother of Akita. He has the ability to morph between the form of a bear and a human. He is the only known Formling aside from his sister that hadn't been frozen by Boreal, who took him as a prize. For decades, Kataru would be held prisoner before joining The Resistance to dethrone the Emperor.
Upon seeing Lloyd leave to find Zane, Vex visits Kataru and offers him a place in the Blizzard Samurai, but being stubborn, he refused by throwing his food at Vex.
Kataru was disturbed by the Ice Emperor, who was banging his staff to awaken Boreal.
The Last of the Formlings (Flashback)
Katuru appeared in this episode in a flashback, along with Akita and the other Formlings. He gave her confidence that they will find their animal forms and will not be formless, like Vex, who had threatened the villagers. A week later, they participated in the Choosing Ceremony. During their time, the two achieved their forms with Kataru becoming a bear and his sister a wolf.
When Boreal attacked Akita, Kataru defends his sister. Despite warnings from his sister, Kataru stayed to fight and stood his ground. In the process, Kataru was taken prisoner by Boreal and presumed his sister died.
When Lloyd was brought to the dungeon, Kataru greeted him. After he revealed his name, Lloyd realized he was Akita's brother and they talked about his sister. Kataru was relieved his sister was alive, surprised that she was not frozen. Kataru then revealed he was taken as a prize by Boreal and how he lost track of time in his imprisonment. Soon, Vex arrived to taunt Lloyd about his efforts to get through to Zane and promised to destroy him. As Vex left, he taunted Kataru too by reminding him of the bars on his cell.
Kataru later advised Lloyd not to waste his strength trying to escape because it was futile. But not for long before Grimfax released and allied with them to overthrow Vex and Zane in order to free him.
As they traveled doubts were brought up, as Grimfax believed Vex wouldn't see them coming. However, Vex had anticipated this and had the soldiers while Lloyd ran off to confront Zane. Assuming his animal form, Kataru engaged the soldiers.
While trying to fight off the Blizzard Samurai, Kataru ends up restrained before Vex orders him and Grimfax sent back to the dungeon.
After Zane regained his memories and destroyed his scepter, Kataru, along with the freed samurai, Grimfax, the rest of the Ninja and Krag, show up at the throne room, where he reunited with Akita with a big hug. He and his sister later joined several soldiers to carry out Vex's punishment, he watched as Vex was banished to the outskirts of the land.
At the Great Lake, he witness the Ninja go back to Ninjago. After Lloyd left, Kataru comforted his sister on this and suggested they roam the realm in their animal forms.
- Main article: Kataru (Relationships)
Being an older brother, Kataru is shown to be kind to his sister, and would often reassure her of her doubts or comfort her by suggesting they roam the realm in their animal forms. He was protective of her, as he defended her when the village came under attack by the Ice Emperor. He was also relieved to hear that she was still alive after all the time he was locked up. During the reunion with his sister, Kataru immediately ran to hug her happy to finally see her again for the first time in decades. After Lloyd’s departure, he comfort his sister by taking her to the woods to enjoy the peace with their animal forms.
After finding his animal form, Kataru gained confidence and bravery as he attempted to fight back against Boreal.
During his decades of being a prisoner of the Ice Emperor, Kataru became stubborn and pessimistic, such as when he outright refused Vex's offer, and didn't believe Lloyd about Akita's survival at first.
According to Akita, he may be somewhat lazy, as he is "loud, always hungry, and sleeps half the year."
- 116. "An Unlikely Ally" (silhouette)
- 121. "Secret of The Wolf" (silhouette)
- 122. "The Last of the Formlings" (flashback)
- 126. "A Fragile Hope"
- 127. "Once and for All"
- 128. "Awakenings"
- His animal form is a bear.
- It is confirmed that he and his sister, Akita, are twins in the official description of "The Last of the Formlings."
- His name is similar to name of Katara from Avatar: The Last Airbender.