Joker (Nolanverse)

"Some men aren't looking for anything logical like money. They can't be bought, bullied, reasoned or negotiated with. Some men just want to watch the world burn."

- Alfred Pennyworth to Bruce Wayne on The Joker

The Joker depicted in The Dark Knight is often considered the darkest version of the Clown Prince of Crime since his early beginnings in DC comics (prior to a softening of character) - perhaps somewhat due to the popularity of Dark Knight some of this Joker's extreme sociopathy has began to sink into the mainstream Joker but in general they are still considered very different criminals in the way they act and think.

The Joker (The Dark Knight)
The Joker, played by the late Heath Ledger, is the main antagonist in the movie The Dark Knight. The Joker is a psychotic villain who claims to be an "agent of chaos," seemingly doing it for the sake of destroying the plans of others and causing maximum psychological and physical damage. In the film, the Joker rescinds his comic weapons in favor of explosives, knives and firearms. He is responsible for the death of Rachael Dawes and for the wounding and psychological manipulation of District Attorney Harvey Dent into Two-Face among others.



The Joker states that he won't kill Batman because he is simply too much “fun” and Batman won't kill him because of his “moral obligation.” In the movie, instead of trying to kill Batman, the Joker attempts to show Gotham and subsequently Batman that anyone can be as bad as the Joker under the right circumstances.

Fate
Heath Ledger died under mysterious circumstances of a drug overdose before the movie was released. Out of respect for him, the filmmakers did not even mention the Joker whatsoever in the following film, The Dark Knight Rises. Thus, it is not known what happened to the Joker after he was arrested.