Kataru

Kataru is Akita's twin brother. He is a Formling and his animal form is a bear.

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. A week later, they participated in the Choosing Ceremony. As he and Akita were trying to find their animal forms, their village was frozen by the fierce Ice Dragon, Boreal. Boreal attacks Akita, but Kataru defends her. In the process, Kataru was frozen, and his status is currently unknown.

Season 11: Secrets of the Forbidden Spinjitzu

 * 122. "The Last of the Formlings" (flashback)

Trivia

 * Kataru is only seen in his 2D animation form.
 * His status is currently unknown, for he was frozen decades before the Ninja arrived.
 * His animal form is the bear.
 * It is confirmed that he and his sister, Akita, are twins in the official description of "The Last of the Formlings." This may have been why their Choosing Ceremony was on the same day, as they are the same age.