[D'awww. One of these days ... he really needed to let on how much he knew.]

The one that's in control of this place; from what I've been able to find over the past year, she seems to be the source of the reality-warps here, and is apparently an American teenage fangirl with no clue that we're actually real - hence things like that trip to that foggy town... as long as she doesn't know we're real, she's a small child with an ant farm.