Saitama.

About Saitama

Saitama is a superhero and the titular protagonist of the Japanese manga and anime series One-Punch Man created by One. He is an unaffiliated superhero from Z-City who dreams of fame and performs heroic acts as a hobby. For three years straight, Saitama had trained enough to become the strongest being that can defeat any enemy with a single punch due to his limitless and exponentially growing physical prowess. However, his overwhelming power leaves him without real challenges, leading to boredom and a sense of emptiness. He becomes the reluctant mentor of Genos, a cybernetic hero seeking revenge on the one who killed his family and destroyed his hometown, after Saitama saves him from a powerful monster. Through Genos, Saitama learns about the Hero Association, a professional organization that combats monsters and protects the Earth.