When he's was little, his dream was trying to become a hero. Yes, he succeed but how? Well, as he was fighting a villian, his dream is to protect people but he want to become an hero just because it's totally fun. (Crab dude, I don't know. ¯\_(ツ)_/¯ )
As he defeated the villian. He kept on training until he turned bald. Honestly, his goal is to find an match that can beat him or reach his level. He find being an hero is boring because he can beat anybody by one punch! Yes, One PUNCH !