I also have to say Harry Potter! For me, it's because I understand Harry's longing for a father figure (Remus, Sirius, Dumbledore), and how eventually he has to stand on his own. I think there are so many metaphors for life (such as having to think happy thoughts when confronting dementors). But I also love the character of Dumbledore, and almost see him as a therapist. My T was my Dumbledore, but she didn't read the books so couldn't possibly understand what that means.