Metal Bat

Bad, better known by his hero alias Metal Bat, is a formerly S-Class Rank 15 professional hero of the Hero Association who went undercover with the rival Neo Heroes after the battle against the Monster Association, working as a bodyguard at the request of the Hero Association.

Metal Bat carries enormous self-confidence, brash and reckless enough to smash first and think later regardless of a threat's supposed danger level. That bravado softens considerably around his younger sister Zenko, whom he spoils and treats with real tenderness, refusing to fight in front of her out of a personal commitment never to show her violence. Like Saitama, he doesn't care much about official rank, and his sheer strength means he sometimes kills enemies faster than he intends to, occasionally before he can get the answers he was actually looking for.