I wrote 500 pages of meta on Buffy, every character, analyzing the story and characters from every angle imaginable.
My creativity comes from I place I can't quite explain. A friend of mine thinks I'm channeling, which, uhm, I'm agnostic or highly skeptical of.
A creative writing prof said I was rather interesting as a writer -- since I was most interested in exploring the difficult motives of people, or the why.
All I can say is the characters start talking to me and I have to get their stories out. I've told myself stories orally since I was 5.