Whoever is writing and/or editing the story is the most powerful. Trust me, you don’t want to get on Grant Morrison’s bad side. Or his good side for the matter. In fact, it’s best to just hide from Grant Morrison if you’re a character, whenever he’s having a meta-moment.
Also, don’t mess with Julie Schwartz and Dan Didio. I still haven’t gotten issue 6 of Ambush Bug: Year None!