Two-Face (Nolanverse)

"It's not I want. It's about what's FAIR! You thought we could be decent people, in an indecent time. But your wrong... the world is cruel. And the only morality in a cruel world is chance. Unbiased...unprejudiced...fair."

- Two-Face

"You either die a hero, or you live long enough to see yourself become the villain."

- Harvey Dent's prophetic quote before he becomes Two-Face.

Two-Face AKA, Harvey Dent is the secondary antagonist in the movie; The Dark Knight. He is portrayed by Aaron Eckhart.

History
Two-Face started out as Harvey Dent, Gotham City's newly-elected District Attorney and "White Knight," and friend of Bruce Wayne (Batman). The Joker, knowing Batman's connection to Dent and Rachel Dawes, his fiancée; kidnaps them both and straps them to time bombs. He tells Batman their locations, but gives him enough time to save only one. Batman chooses Rachel, but when he gets there, he finds Dent instead.

Dent gets rescued (against his wishes, as he wanted his fiancée saved) and Rachel dies in an explosion. The left half of Dent's head gets burned. Angry, the former D.A. takes up the name "Two-Face" and wants revenge on those whom he believed were responsible for Rachel's death; The Joker, Gordon, and Batman. The Joker convinces Two-Face that he was just acting on impulse, to which he flips for his life. The coin came up good side, so the Joker lived. Two-Face then confronts Batman and Gordon on the top of a building where he plans to judge Gordon's son. Before that, Two-Face promptly shoots Batman through the chest when the coin lands bad heads and spares himself on the coin landing good heads. He dies when Batman tackles him, causing him to fall off the ledge of the roof and break his neck.

Batman and Gordon agree to cover up Dent's villainous acts by putting the blame on Batman. Harvey Dent's death is used to create a new law dubbed the "Harvey Dent Act", whereby anyone with criminal affiliations would be convicted without trial or parole. When Bane finds out about the truth about Dent, he uses it in his crusade against Gotham.

Triva

 * He is second love interest of Rachael Dawes