@Saren CrimsonThe fact that the characters are living game consoles is what makes them OP. Easily, Neptune being that she is Sega, could alter the playing field of any game from the Sega Universe. It is just too OP to have game console characters in this game.
@arowne97Now I haven't played any Doom games. I figured it was just a FPS and Doom Slayer is only as strong as his weapons, which doesn't really make him OP. He may be OP in Doom, but probably not when he goes to other game universes. As for Zero, he is available and please be sure to claim all versions of Zero so we don't have more than one walking around.