Onima is a Pro Hero and one of the over 30 Sidekicks who work at the Endeavor Agency. He wears a horned happuri that frames his face. During the Joint Training Battle, Onima informs Endeavor that they are receiving a multitude of requests for Team-Ups and interviews. Endeavor simply orders him to compile to list of the team up offers, most interested in trying to contact his son Shoto. Since he does not get replies, Endeavor yells Shoto's name while engulfed in flames. Onima suggests that Shoto is probably in class at the time, while his partner Kido express concern about the mental state of Endeavor.