Katen (火天, Katen) is the son of the Monkey King, establishing him as the current Prince of Primates among them. The personal summon of the Eighth Hokage, he has become an independent operative upon his master's request in the world. Investigating the attacks of Zetsu, he would uncover a plot to overthrow his Kage master, though it would be too late. With the Ninth Hokage taking over, he was forced to remain silent as he had no way to truly prove (alongside Konohamaru) that the Ninth was working for Zetsu, until the fall of Konohagakure itself, where he and his master escaped.