Re: The Dark Knight to have a female villain?
^ This is actually how I would see Harley fitting in. Someone like Lisbeth Salander from "The Girl With the Dragon Tattoo" books, goth and a psychiatrist who works at Arkham Aslyum who becomes corrupted by her fascination with the Joker. I think it would work.
Chief of Operations
Ignoring the The Last Stand since 2011.