Joker Vs Batman Rogues, sort of
Looking at other sites just now, i was reminded that Joker was supposed to die in his debut, making him a one shot villain:
Thankfully, we got this instead:
So, with no Joker for Batman to fight for 20+ years, then be brought to manic life in 1966 by Cesar Romero, seen in cartoon form after that, made psychotic in the 70s, re-imagined again by Jack Nicholson, made an icon (if he wasnt already) in stories like The Dark Knight Returns, The Killing Joke, A Death in the Family etc., who the heck would Heath Ledger have been playing in The Dark Knight???
Which of Batman's existing rogues would/could have become his arch enemy and why? Who has that kind of "star power"?