Batman: The Dark Knight

"Do or do not
there is no try.
DarknessFalls

A billionaire who has dedicated himself to protecting Gotham City from the criminal underworld. Bale was confident in his choice to return in the role because of the positive response to his performance in Batman Begins. He trained in the Keysi Fighting Method, and performed many of his own stunts. He did not gain as much muscle this time, because of the storyline in which Batman builds a new suit that allows him to move with more agility.

The actor described Batman's dilemma as whether "[his crusade is] something that has an end. Can he quit and have an ordinary life? The kind of manic intensity someone has to have to maintain the passion and the anger that they felt as a child, takes an effort after awhile, to keep doing that. At some point, you have to exorcise your demons." He added, "Now you have not just a young man in pain attempting to find some kind of an answer, you have somebody who actually has power, who is burdened by that power, and is having to recognize the difference between attaining that power and holding on to it." Bale felt because Batman's personality was strongly established in the first film, it was unlikely that his character would be overshadowed by the villains, stating: "I have no problem with competing with someone else. And that's going to make a better movie."

Heath Ledger described the Joker as a "psychopathic, mass murdering, schizophrenic clown with zero empathy". Nolan had wanted to work with Ledger on a number of projects in the past, but had been unable to do so. When Ledger saw Batman Begins, he realized a way to make the character work consistent with that film's tone, and Nolan agreed with his anarchic interpretation. To prepare for the role, Ledger lived alone in a hotel room for a month, formulating the character's posture, voice and psychology, and kept a diary, in which he recorded the Joker's thoughts and feelings to guide himself during his performance. While he initially found it difficult, Ledger was eventually able to generate a voice that did not sound like Jack Nicholson's take on the character in Tim Burton's 1989 Batman film. He was also given Batman: The Killing Joke and Arkham Asylum: A Serious House on Serious Earth to read, which he "really tried to read [...] and put it down". Ledger also cited inspirations such as A Clockwork Orange and Sid Vicious, which were "a very early starting point for Christian [Bale] and I. But we kind of flew far away from that pretty quickly and into another world altogether." "There's a bit of everything in him. There's nothing that consistent," Ledger said, adding that "There are a few more surprises to him." Before Ledger was confirmed to play the Joker in July 2006, Paul Bettany, Lachy Hulme, Adrien Brody, Steve Carell, and Robin Williams publicly expressed interest in the role. On not being invited to reprise the Joker, Jack Nicholson jokingly remarked that he was "furious". In turn, responding to his initially-controversial selection to play the Joker, Ledger stated publicly, "It would not matter who is chosen to play the [Joker]. [...] In any film, there is always someone who does not like you and I am secure in my choices and my record. But I know at the end of the day you are never going to please anyone 100 percent%u2026I refuse to carbon copy a performance. That would not be a challenge and it would be mocking Mr. Nicholson, whom I have much respect for."

The Gotham district attorney; Dent's battle with the Joker turns Dent into a murderous, disfigured vigilante called "Two-Face". Producer Charles Roven described Dent as initially the "white knight of the city". Wayne sees Dent as his heir, which comes back to the theme of him realizing that being Batman will be a lifelong mission, and the tragedy that follows when Dent is corrupted. Whereas Two-Face is an evil villain in the comics, Nolan chose to portray him as a twisted vigilante to emphasize his role as Batman's counterpart, and Eckhart, who has played corrupt men in films such as The Black Dahlia, Thank You For Smoking and In the Company of Men, notes: "[He] is still true to himself. He's a crime fighter, he's not killing good people. He's not a bad guy, not purely," while admitting: "I'm interested in good guys gone wrong." Nolan and David S. Goyer had originally considered using Dent in Batman Begins, but they replaced him with the new character Rachel Dawes when they realized they "couldn't do him justice".

The Gotham assistant D.A. and childhood friend of Bruce Wayne, she is one of the few people who know that he is Batman. Gyllenhaal has acknowledged that her character is a damsel in distress to an extent, adding that Nolan had sought ways to empower her character so that "Rachel's really clear about what's important to her and unwilling to compromise her morals, which made a nice change" from the many conflicted characters whom she has previously portrayed. In August 2005, before the casting of Gyllenhaal, producer Charles Roven had reported that actress Katie Holmes, who portrayed Rachel Dawes in Batman Begins, was going to reprise the role in The Dark Knight. In January 2007, however, Holmes turned down the offer to reprise her role as Rachel Dawes due to scheduling conflicts, and, by March 2007, Gyllenhaal was in "final talks" for the part.