Copyright laws protect writers from unauthorized reproductions of their work, but such reproductions only include verbatim copying. Characters are only copyrightable if their creator draws them or hires an artist to draw them.If your reaction was to snort a beverage through your nostrils, congratulations! You know something about copyright.
If your reaction was to nod sagely and tap your lips with your finger, then I'm afraid you have a little studying to do. (Preferably before the Hachette/Summit lawyers come calling.)
[via Nick Mamatas, and already at least a day late]