User blog comment:Goldencahill/MAAFFU - OC Contest of Champions Entries/@comment-26927984-20160919060150/@comment-24335505-20160919110215

They cannot be omnipotent, so they must have some sort of 'weakness' or limitation of power, they cannot be immortal or like Wolverine/Deadpool in that they just cannot ever die, and you cannot suddenly unlock new powers during the fight that don't fit in with your original abilities.