Since no enemies have posed any real challenge to Saitama yet, the upper bound of his strength is likely even higher than it appears. While his power is only limited to heightened human traits - Saitama cannot fly or fire energy blasts - his superhuman abilities more than makes up for the lack of variety in his powers.
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).Though in the end, Boros still couldn't draw out Saitama's full power.. He has shown dislike towards his assigned hero name, Caped Baldy. Saitama shows impressive restraint with his power, considering that he is easily capable of splitting the sky, or jumping from the moon to earth.
He manages to beat nearly all of his opponents with a single punch, though occasionally causes more devastation than necessary. So far no enemy has been able to injure him in any way and almost no enemy is even able to survive from a single earnest punch from him. A few enemies have survived punches from him, such as any human he has struck (which he was likely holding back against) and Boros, whom Saitama empathized with and held back against so as to give himself and Boros a satisfying and stimulating fight. While he has no problem killing monsters, Saitama has yet to be seen killing another human, and only ever uses enough strength to knock them out. Saitama is the titular One-Punch Man and the strongest character in the series. Saitama is a bald, ordinary looking man with a thin, but well-built physique and of average height and weight.