Bad (バッド, Baddo), better known by his hero alias Metal Bat (金属バット, Kinzoku Batto), is the S-Class Rank 15 professional hero of the Hero Association.

Metal Bat is a young man with black hair styled in a pompadour, and dark eyes that emphasize his hot temper. He wears black bontan pants and a black Japanese school uniform, which he drapes over his red long-sleeved turtleneck sweater.

Metal Bat has a great deal of confidence in himself, stating that he does not care whether a threat is a Demon or Dragon level. He also seems to be brash and reckless, as shown when he immediately smashed one of Melzargard’s marbles instead of trying to analyze what purpose it serves for the enemy. Furthermore, he was willing to challenge Sweet Mask for his mocking attitude before being interrupted by a call from his sister and Sweet Mask’s manager.

Despite his brash attitude, he still has a soft side in him when it comes to his sister, Zenko, who he treats very well and spoils to an extent. He values promises between Zenko as shown where he refused to take down Garou in Zenko’s presence despite being attacked by him due to a commitment to never show her violence. He has also demonstrated similar love towards his pet cat, Tama. Like Saitama, he doesn’t care about his rank, and accidentally kills his enemies faster than he intended, such as when he executed Rafflesidon and Senior Centipede before he could get any answers for their motives. After waking up he is usually quiet unlike usual, though he claims he is not a “morning person.”