Rudy

Once a star baseball player, Rudy is a big bruiser with a short temper to match. After an incident prevented him from playing ever again (around the same time he grew those weird horns), he turned to lending his strength to the Yakuza. After exile from the Yakuza due to fear of a developed quirk related to his temper, he now wanders around Sakura Isle, searching for a new purpose.

Personality:
While most people expect Oni to be brutish, overtly violent, and overall uncivilized, Rudy is very stoic and often not willing to hurt anyone. He only takes violent action when there's a great danger present, or when someone is directly pestering him or getting on his bad side.
His mostly laid-back nature makes him seen as a gentle giant to most smaller yokai who turn to him for protection. He usually advises others to not stay close to him, since his oni form makes him a walking death wish that could trigger at any moment. He really dislikes being asked to do menial tasks, usually declining and suggesting asking someone else "more capable than him". Offering something of value to him in return does make Rudy more willing to comply, though.

Powers/Weapons/Attributes:

Oni Bat:  A specialized baseball bat given to Rudy by Lord Enma to aid in his duty of punishing evil doers. With his athletes strength, he can easily cause blunt force trauma with a simple swing, and in some cases complete dismemberment!

Rudoni Form: When his temper reaches a boiling point, Rudy will grow into a gigantic oni. His bat also grows into a colossal club as well. In this form, he goes on a rampage, laser focused on whoever provoked him. He won't stop until the provoker is completely crushed, or until he's pacified. He shrinks down to normal size once his anger settles.

Brutal Honesty: No matter what kind of question is asked of him, Rudy is forced to answer with complete truth in his words. It could be his preference on something, the whereabouts of someone, or even whether or not they're a potential target for the bruiser - Rudy will always give a very true answer based on his own knowledge whether he wants to or not.
As a great oni lord once said "there is nothing false in the words of demons"