Kai is a misophobic, antisocial sociopath who is obsessed with returning the world to the way it was before the Quirk phenomenon. Due to a combination of an old theory claiming Quirks derive from rats and his own phobias, Kai believes Quirks are a plague. A slender young man with short, shaggy auburn hair, parted to the right. His eyes are thin, their irises small and gold, with rather long lower eyelashes and small brows. He has three piercings in his left ear. He wears a plague doctor mask.