All 13 One-Punch Man Characters Who Know Saitama's Secret (& When They Found Out)

The source of Saitama’s power in One-Punch Man isn’t exactly a closely guarded secret, but many characters have overlooked just what the hero is capable of. To most of the Hero Association, he is simply an unremarkable-looking hero with a bald head, a cheap costume, and a seemingly mediocre ranking.