3. Thomas Elliot a.k.a Hush
There are plenty of Batman villains that have been left out of the Dark Knight movie continuity thanks to their more recent inception. Hush is one such villain, who's only appeared in DC lore of recent years and as such has been almost completely untouched by cinema. Hush is Thomas Elliot, who in 2003 was introduced to followers of the Batman main canon as Bruce Waynes childhood best friend. Unbeknownst to Wayne, Elliot hid a dark side and harbours a worryingly sociopathic grudge against the entire Wayne family. Publically as an adult Elliot is a brilliant surgeon but privately hes the villain Hush, who uses his keen mind and surgical precision to wreak havoc on Gotham and the Wayne family name. Hush is one of the more popular recent Batman rogues and hes already featured (albeit in a minor role) in Rocksteadys Arkham City. Make no mistake, whether before or after the Justice League movie, there
will be more Batman movies, meaning theres space for a new villain. Maybe Hush wouldnt be at the top of my list, but hed certainly place in the top ten.