Saitama (サイタマ, Saitama) is the main protagonist of the series and the titular One-Punch Man. He is currently the most powerful being to exist in the series. Saitama faces a self-imposed existential crisis, as he is now too powerful to gain any thrill from battle.Saitama (サイタマ, Saitama) is the main protagonist of the series and the titular One-Punch Man. He is currently the most powerful being to exist in the series. Saitama faces a self-imposed existential crisis, as he is now too powerful to gain any thrill from battle.