For what it's worth, I think Fiona really comes into her own by the end of book five. She stops worrying so much about being a "real girl", with all its Pinocchio overtones, and starts to claim who she is.

They are harrowing books. In several places I wasn't sure whether I could keep reading. I'm glad I have, though.

I also really really like the relationship between Fiona and her dad. It could have become two-dimensional at several points, but it hasn't.