4. Alfie Allen
If youve been watching Game of Thrones (which you really should have been), then youll recognise Alfie Allen as the guy who played Theon Greyjoy. Before we even get to his ability, you must agree that with his unique look (attributed mainly to those cold, bright eyes and stark facial structure) hed be a striking version of The Joker that for my money would act as a happy medium between Ledgers take and the more traditional Clown Prince of Crime from the page. Fair enough, Allen is a relatively unproven talent, especially green for the sheer gravity of a role like the Joker, but you never know, a reboot is going to take a year or two at least; plenty of time for Allen to establish himself in Hollywood yet.