One Punch Man

I think the opposite, they've been shown to take damage and die. I think he one-shots every single one. I think they'd be perfect OP adversaries because they'd wreak havok on all other heroes and then Saitama could just yeet their heads off.

OPM's central premise is that he is at the top of the power scaling. Yes he can beat goku, yes he can beat superman, yes he can beat omniman. Thats his whole conceit

Id say oneshotting all of them is just a question of how much collateral damage is acceptable.

The strongest in the series is at or just under Boros level. Probably just barely capable of planet busting but never confirmed. He would be able to do it through sheer brute strength instead of needing an energy attack, so physically would be Boros’s superior. Saitama could one shot them all, just a matter if he can do it without sacrifice a hemisphere.

Saitama’s whole deal is he’s the most powerful of all. He’d teleport behind them and obliterate them