eh what? Not much of a nerd but heaths joker seems to be closer to the later era graphic novels depicting the joker no?
Well, I mean you could just as easily go either way on that one. Nolan tends to take Batman characters and do whatever he wants with them. Ledger brought the Joker to life though. No other actor can claim that.
You could make a stretch and say that Nolan based him off the "killing joke" version of the Joker - but that is too much of a stretch to hold up to any kind of scrutiny, in my view.
The Killing Joke version of the Joker is almost a sympathetic character, this version just isn't. He does make mention of a tortured past... vaguely "do you know how I got these scars?"
And he does try to put people in a traumatic experience, ala the boat scene, to change their perception of the world...but in my opinion that is right where the accurate comparisons end between Nolan's version of the Joker and modern, pre Heath Ledger, graphic novel depictions of the character.
I would actually argue that Nicholsons joker is the most faithful depiction of the original Joker, which is odd because Tim Burton didn't read any comic books. (So he says.) Burton's Joker was a mafia lord, killed people with over the top schemes that involved chemicals inducing smiles on his victims, he's actually kind of funny instead of just being twisted with clown paint on.
I would argue that the Nicholson joker inspired future depictions of the character to the point where, if you want to say Ledger's joker was faithful to the graphic novels, you still have to point out that those graphic novels were influenced by Nicholson and Burton (Bruce Timm and Tim Sale who put together the Batman TAS were also influenced by the Nicholson Joker) and thus...so was Ledger, to a large degree.
But, in spite of all this...
The Joker killed Heath Ledger.
The Joker actually reached through the realm of fiction and killed someone.