Even though everyone will say Saitama; Guy's eighth gate of death makes him so powerful that he can bend matter and make punches with only the air faster than a minigun. He may not be able to destroy a planet like Saitama, but Guy trained longer and harder than Saitama did.
[spoiler]Also; people who call anyone who watches anime a weeaboo, [i]there's the door[/i]. Negativity doesn't help anyone.[/spoiler]
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Unfortunately, Saitama was made to be OP. And just something I noticed, Saitama can beat anything in one punch, hence One Punch Man. But all these other characters have one ginormous attack equal to one of Saitama's punches. Usually these ginormous attacks take a little time to use. Now Saitama can throw [i]ten[/i] (rough estimate) of his punches within a second! Like I said, "Made to be op."