There's an ongoing debate in the YA world--flames fanned by, at least, both Justine Larbalestier and the Brotherhood 2.0 guys, who have sadly stuck to their one-year commitment* and gone dark since January 1--between the unicorns and the zombies. Charlie may actually be a unicorn that zombie-lovers could embrace.
Thankfully foul-mouthed unicorns are not on my reading list (as far as I know) for the Cybils SF/Fantasy award. But if they were, I hope they would be like Charlie.
*But! They do have a new social network for nerdfighters!