Honourable Mention: Harley Quinn
Harley misses out on a place in the top 10 simply because of her status as The Joker's girlfriend. Whilst she is a brilliant character, it is still hard to imagine her inclusion in The Dark Knight and whether it would have been a positive inclusion to Heath Ledger's character, with the answer probably lying in the fact that she was not included because she was unnecessary to the plot. But still, Nolan has proven he can create a strong female character in Catwoman, so he could definitely have done Harley justice, with her likely becoming a huge hit with male fans due to her revealing outfits and psychotic nature. Whilst Harley could have added an intriguing dynamic to Ledger's Joker, her role in the film would have been muted by the impact that Two-Faces introduction has, not to mention the Joker's lack of empathy for anyone else in the world, including himself. It is unlikely he would have accepted what is effectively a sidekick, especially one whom he has never showed any affection towards. However, had The Dark Knight Rises gone a slightly different route, it would have been interesting to see a vengeful Harley, who had never really known the Joker but become smitten with him anyway, targeting Batman and joining forces with Bane or even bringing Bane to Gotham in the first place. The Mad Hatter and Poison Ivy get an honourable mention here too, only not included because of their slight similarities to other Batman villains, it is hard to imagine Mad Hatter's mind control coming off as anything other than a Scarecrow trip whilst Poison Ivy was beaten to the post by another temptress in the form of Talia Al Ghul. Click "next" to begin our list;