Saitama is the devastatingly overpowered hero at the center of One-Punch Man, a completely ordinary-looking guy who trained so hard that he accidentally removed almost every challenge from being a superhero.

Three years of relentless training leave Saitama strong enough to defeat nearly any opponent with a single punch. Monsters capable of leveling cities, legendary martial artists, and threats that send other heroes into panic can disappear before Saitama has even become emotionally invested in the fight.

That is precisely the problem.

Saitama wanted to become a hero because it seemed exciting. Achieving overwhelming strength gives him the power he dreamed about while draining combat of the thrill that motivated him in the first place. Much of his story is therefore less about becoming stronger and more about finding meaning after strength stops being a useful goal.

Despite his absurd ability, Saitama is refreshingly mundane. He worries about grocery sales, struggles with recognition, plays video games badly, and spends a surprising amount of time explaining himself to people who have no idea how powerful he actually is.

He may be able to end almost any battle instantly.

Getting to the supermarket before the sale ends remains a legitimate emergency.