Protagon is a robot created by the mutant Forlon. He created Protagon as to be a partner in crime, but he is too soft-hearted to do wicked things alongside his creator. In the dark of night, Protagon attempted an escape, but failed when Forlon awoke and, with nightvision, re-captured Protagon and beat him. After a year, Protagon attempted another escape and prevailed. He fled to Makuhero city, where he posed as a Hero and was sent on missions.