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Posted By: yellowparisTroels' answer
Well, yeah, that's pretty much right. The GM's minor duty is the playing of NPCs (technically, there could be no NPCs in a game, though that'd be pretty dull for the GM). The major duty, then, is ensuring fair balance of power between characters and players. That could include denying a proposed addition to back story.If you are inserting something that is only to do with your character (Wanda's mother) or that is only color (witches), that's unlikely to come up. If you say something that affects other main characters, it invites scrutiny. If the relevant players don't have a problem with it, though, there's nothing to worry about.