4. Hush
Hush is actually Thomas Elliot, a secretly sociopathic childhood best friend of Bruce Wayne who attempts to kill his own parents for the inheritance by cutting their car brakes. He began a secret life-long vendetta against Bruce Wayne after Thomas Wayne foiled his plan by saving his mothers life.
How it Could Work: Thomas Elliot has since become an internationally renowned surgeon; but as Hush he still plots against both the Dark Knight and Bruce Wayne with manipulative tactical guile and surgical precision. The plot of a Hush centred Batman movie wouldnt necessarily be all action, but rather Batman having to unravel a complicated mystery, in which nothing is fully certain, but at the heart of which lies Hush.
Who Could Play Him: Another character thats largely open to interpretation; Hush appears with his face covered in bandages (a reference to his alter-ego as a surgeon) but hes supposed to be a sort of dark mirror to Bruce Wayne. With that said, whoever is cast as Hush would ideally look and sound similar to whoever was cast as the new Bruce Wayne.
Likelihood: Hush is definitely one of the most popular modern rogues (he only appeared in 2002), and has already gone on to be the prime villain in quite a few serperate storylines. He also appeared briefly in Arkham City too, to the delight of fans. Its not 100% likely that well see him in the next Batman movie, but hes certainly not one to rule out either.