@NR: Hmm?

@Sloth: Kitty has near master combatant level. Granted it's constantly ignored by writers, but still. Mainly, though, she has history with groups such as The Hand. Serious history that could easily be incorporated into Batman stories. As I said, if done right it'd be a great intertangling of characters. It's not like he's throwing in an X-men character for the hell of it.