Batman villain info: Two-Face

HARVEY DENT aka TWO-FACE

Harvey Dent was Gotham City's district attorney, but after being scarred for life, turned to a life of crime.

Origins
Maverick Gotham City District Attorney Harvey Dent was nicknamed "Apollo" by the media, because he was charming, good-looking and seemingly untouchable. He was dedicated to his job of upholding law and order, and became one of the first supporters, allies and even friends of the Batman. At the time of his job as D.A., the worst criminal threat in Gotham was nigh omnipotent mafia boss Carmine Falcone, "The Roman." He forged a triumvirate with Batman and Commissioner James Gordon to bring the man down within the law, no matter what the cost. His slightly angrier temperament led Batman and Gordon to distrust him slightly, believing there was a possibility he might be the mysterious "Holiday" killer who was gunning down mob members at the time. Some of the Internal Affairs agents gave him the nickname "Harvey Two-Face". The alliance ended tragically when Sal Maroni, believing Dent to be responsible for the death of his father, threw acid in his face during a trial. Harvey was horribly scarred on the left side of his face and his left hand.

Harvey escaped from the hospital and descended into madness. He became obsessed with duality and opposites, and developed a second persona, the villainous Two-Face, to compliment the law & order-obsessed Harvey Dent. As Two-Face, his trademark was crimes involving the number two. His obsession even shows in his clothes, which are usually composed of two halves made out of very different materials. He carries a double-sided coin, with one side smooth and the other side scarred.

Analysis on Criminal Insanity
Two-Face is not consistently evil; every time he contemplates a crime, he flips his two-headed coin. Only if the coin came up scratched-side did Two-Face go ahead and commit the crime, never questioning the result of the toss. This compulsion is a compromise between Dent's evil "Two-Face" personality and his former, law-abiding self. Over the years, he has been shown to rely on the coin to different degrees. Sometimes to decide whether or not to commit a crime, sometimes to decide whether or not to do something good, like save someone. He will even go out of his way to do good deeds if the coin mandates, like donate huge sums of money to charities.

Over the years, various attempts have been made to repair his facial scars, but none have successfully cured his insanity long term; although he has briefly returned to his Dent persona, he has ended up simply destroying one side of his face and becoming Two-Face once again.
http://batman.wikia.com/wiki/Two-Face

Portrayals in live films
In the 1995 film Batman Forever, Tommy Lee Jones portrayed a slightly campier Two-Face alongside Jim Carrey's Riddler and opposite Val Kilmer's Batman. "Harvey Two-Face" plays up the "two" gimmick to the point where Two-Face even refers to himself in the plural (we, us, our) almost all the time (except for one instant when he says to Robin, "I'll see you in Hell"). Here in this film, Two-Face is also responsible for Dick Grayson's origin as Robin, having murdered the latter's parents and brother in an attempt to blow up the circus (in the original comics, it was Boss Zucco who was responsible for the death of Dick's parents). Two-Face joins forces with The Riddler and the two gain knowlege through the box and discover Batman's true identity; following this they travel to Wayne Manor and Two-Face's thugs kidnap Dr. Chase Meridian while The Riddler goes on to destroy the Batcave. Two-Face was about to kill Bruce, but Riddler intervened, sugeesting that he solve one last riddle, and then they head back to Claw Island. Two-Face perishes at the end of the movie: He flips his coin to decide if he should kill Batman, giving the Dark Knight the opening to toss a handful of identical coins into the air. Two-Face panics and tries to find his coin, slips from the beams and falls into the watery bed of spikes at the bottom of Claw Island. His real coin then falls into his open palm, good side up.
http://batman.wikia.com/wiki/Two-Face_%28Tommy_Lee_Jones%29

In The Dark Knight, Harvey Dent is portrayed by Aaron Eckhart. He has been elected District Attorney of Gotham City. His election takes place during the viral marketing campaign that lead up to the film. He is supported by his girlfriend and assistant DA, Rachel Dawes. The Joker engineers a plan to corrupt Dent by having his gang kidnap Dent and Rachel, and transport them to opposite ends of the city, such that only one will be saved, and the other will die. While trapped in an explosive-rigged warehouse, Dent, in an attempt to free himself, falls on his left side and knocks over a large can of gasoline, which spills onto the floor and goes across the left half of his face. Batman, being fooled by the Joker into saving Rachel, finds Dent instead, but nevertheless goes on to drag him out of the place. As the building explodes, a fire catches on the left side of his face, disfiguring it. Driven into grief and insanity by the death of Rachel, as well as by his own disfigurement, Harvey evolves into the vengeful vigilante known as Two-Face, setting off to judge the corrupt cops and mobsters by the toss of his coin, seeing this as the only way to 'make things fair' (given the 50-50 situation that Dent survived and Rachel did not). Even Batman and Commissioner Gordon are not being spared; Gordon's family are being taken hostage at the very place where Rachel died. In the end, Two-Face meets his end at the hands of Batman; as he tossed the coin to decide the fate of Gorodn's son, Batman delivered a scissors kick to him, resulting in Two-Face falling off the ledge and breaking his neck. Knowing that the Joker would really win if the public were to ever know about Dent's corruption, Batman tells Gordon to place all of Dent's crimes onto him, in order to preserve Dent's reputation and vision for a safer Gotham.

http://batman.wikia.com/wiki/Two-Face_%28Aaron_Eckhart%29