Saitama is the main character of the hit manga and anime series One Punch Man. He is an exceptionally powerful and undefeatably strong hero who can defeat almost any enemy with a single punch. Saitama has a calm and nonchalant personality, and he's not one to show off or boast about his incredible strength. However, when push comes to shove, Saitama will go all out and use his full power when needed, which makes him an unstoppable force to be reckoned.