It ocurred to me today that a lot of cartoon characters would make good characters in Grimm. They're all pretty morally ambiguous or incompetent. The coyote, good ol' Sam...and the rabbit himself. You can see them harassing the children one moment and coming in to heroically save them the next.
And, of course, some were inevitably corrupted. What twists can you find on the loony bunch?
By the way, I know that Warner Bro's copywrite rules are strict, so just in case it might be best to avoid the actual names. Don't want the Tasmanian Devil showing up with a lawsuit.