As a kid I really liked books that were written an animal perspectives (no not in a childish way) Off the top of my head I remember liking White Fang, the Julie of the Wolves Trilogy, and Call of the Wild.
I started reading a lot of fantasy fiction as I got older the Dragonlance series, Terry Goodkind (only read him if your demented), lotr, and the Wheel of Time Series. (Very good, but extremely detailed). Like many girls I went through a vampire literature phase. However, it was none of the this bland, 1-dimensional, teenaged angst bullshit that is the Twilight series. Vampires drink blood, they're demented, violent, and manipulative. Vampires don't play baseball and fucking sparkle! Dammit fangirls go read some Hellsing
and get some perspective! *read right to left*
I guess I should mention manga then too. My favorite mangaka is Kaori Yuki, for her work on Count Cain, Angel Sanctuary and God Child. Don't flame me for liking Angel Sanctuary, the OVA was terrible, but the manga is incredible. The art is gorgeous and the depictions of hell, heaven's hierarchy of Angels, and the origins of man and angel kind are fascinating. The mangas for Fullmetal Alchemist, Hellsing, and Death Note are also much better than their anime adaptations.