My Little Pony XXXI: The Great and Powerful XXXie!

[Tiki Snakes]

Would work nicely in a dimension hopping setup. A Quantum Leap one would hinge on her NOT being able to skip out until she'd fixed things, (Ie, derailed the badfic to the point of it being a little less bad?).
EDIT - I am slow.
Clearly, she can leave the Fic once she has done what she can, and ensured that the fic is about 20% cooler.

Though either way, an interactable narrator I can get behind. I considered suggesting it being Pinkie, via fourth-wall-shattering, but I'm not sure how meta you'd be interested in going.