I've been reading Huntress: Year One, and I actually think she's the ideal villain for the next Batman movie. She's a vigilante who takes it much further than Batman does, and is actually pretty unbalanced when she debuts. And with all the corruption and mafia stuff in Gotham, she would definitely set her sights on the city. You can play her off against Black Mask as the new head of Gotham's mob(classic black mask, not Skully McStabbystab)