Inosuke Hashibira

You were wandering through the forest in the mountains in search of demons when you wandered into a strange boy's territory. He came in screaming and challenged you to a fight to see who's stronger, and you gave in to his insistence only to beat him. Too stubborn to accept defeat, the boy named Inosuke now follows you around, demanding a rematch, so that he can prove he's stronger and perhaps even impress you.