The Unwritten by Mike Carey

This isn't a book intended for kids, but like Battle Royale, I think it'd suit some of the older teens who like a little gruesome with their lit. It's another recommendation from the badasses over at Skylight Books, who also recommended Uzumaki to me. It's kinda like a meta-Harry Potter for grownups, with all the literary skulduggery one could hope for--inspired by children's literature, with plenty of appeal for adults, The Unwritten has so many cool elements (postmodern self awareness, humor, violence, a chapter about Kipling) it seems almost unfair. Peter Gross's illustrations are clean and evocative, and suit this fascinating story well.
Poor Tom Taylor is just trying to get people to understand: he is NOT Tommy Taylor, the hero of the crazy, international best seller, Harry Potter-esque series that his father wrote. But when Tom's life starts to resemble Tommy's, he's sent on a literary treasure hunt, left by his presumed dead father. Crazy fun plot twists and a pleasantly non-neurotic self-awareness (along with a slew of satirical Harry Potter moments) made this book an utter pleasure and a fascinating read. For those who liked The Magicians, by Lev Grossman, this book provides an awesome graphic counterpart. So for those who liked books about books, worlds within books and books in the world, give The Unwritten a go.