Saitama (サイタマ, Saitama) is the main protagonist of One-Punch Man and the most powerful hero alive. Saitama faces a self-imposed existential crisis, as he is now too powerful to gain any thrill from his deeds.

He is currently registered with the Hero Association as a B-Class Rank 7 professional hero and is tasked to defend Z-City against Mysterious Beings. Under the Hero Association, he is given the name Caped Baldy (ハゲマント, Hagemanto; Viz: Bald Cape).