A lot of people are saying all-powerful reality-controllers win this contest. And that's all well and good until you realise anyone can invent such a faction and install them at the head of their respective reality. And then we have factions poking into other realities. Such as the Combine. Even more powerful. But is there a fictional faction/entity so powerful that it can pervade multiple fictions of [i]different[/i] authors and creators, so powerful that its influence spreads beyond the control of its own creator? More worryingly, a fictional being so powerful, it has enormous control of our very own reality. Ladies and gentlemen, may I present you the god of Abraham. Edit: oh, race. Erm. I guess the most influential real-world religion with a pantheon.