There's probably some R34 of omnipotent characters within their respective fictional universe. It'd basically be a tie; because writers, creators, and authors don't have the authority to anoint their own omnipotent characters as being stronger than that of another creator.
So it'd just be a stalemate between the omnipotent gods of different fictional universes that actually have uploads here. That's why "power scaling" versus battles at a higher scale end up being pointless.
If Anti principle or Monad had hentai images it would be one of them for sure but since they are concepts I think that any SCP "god" character would be enough to beat anyone.