First things first, welcome back Melkay
Thank you, man!
But... really, you could have made a better welcome. Talking about this topic again sends shivers down my spine. But it's 2009 and I am post-banning Melkay now, so let's go at it again...
If someone takes over they don't have to just imitate Ledger. Joker hasn't got a set, unchangeable personality in the comics, why does he have to on film?
The problem is that in the comics,
nothing is unchangeable. Not even Batman, or Gotham. They change in content and style all the time (slight variations, most of the time) but here you are asking to replace several elements of a character (physical appearance, voice tone, mannerisms and body language) and keep the rest of the enviroment the same. Same Bruce, same Batman, same Gotham, same everything... how the hell does that play out?
I said it before, and I will say it again: it is a distracting jolt, and one without purpose or intention. You're not saying anything about the mythos by changing aspects of the character (as opposite to the comics, or the Gotham Knight animated film)... you're only doing it because you want the Joker back. And, in my personal opinion, there are no obvious reasons to have the Joker back for the third.
I ahd a teacher that had this motto: "There's a difference between 'having something to say' and 'having to say something'."
The guy has a series of mental problems, who says schizophrenia isn't one of them? Who says he could emerge from Arkham slightly different than TDK?
And who says he can't be dressed as Santa, riding a flying sleigh and dropping bags of poo down Gotham's chimneys? Anything is possible in film, isn't it?
The crazyness of the Joker is not unlimited, he just seems to be too radical. In TDK he proved to be in complete control of his actions. And we're talking about a guy who sufferend imprisonment (although only for a few hours) and had his face brutally scarred at some point in his life, probably along with more severe traumatic experiences. Do you think some time in Arkham is going to
change this guy? Remember: he is an unstoppable force of nature. He is above Arkham, and probably feels at home there. A little time in the cooler is not going to do anything to him.
There's a little thing you guys need to understand about the character... he is NOT a variable. He is a Constant.
Obviously the look would have to be similar, maybe shorter hair like the more traditional Joker seeing as he would get it cut before getting put away probably.
Yah, lets find this incredibly talented actor who also has a similar appereance to Ledger's...
Keep the little tics and keep the voice similar.
... make him exteriorize Ledger's unique body language...
But him having a slightly different personality could be explained.
... and then change his personality (this is the job of the writer, not the actor) to make his job even more difficult. Hey, let's start looking for that guy right now!
It could be quite unique actually, make Joker a constant menace like a horror movie character. But in a crime thriller.
That was what he was in TDK, mostly due to Ledger's personification of chaotic evil. Not everybody can do that as well. Besides, I recall you wanted a Joker with less screen time in the sequel, right? Well, lets find out this incredibly talented actor who an do all these amazing feats of thespian skills. That should be easy.
The problem is that... no matter how good that guy is, continuity is going to be compromised anyway. Ledger had enough trouble being compared to Nicholson, and his performance evaluated. He achieved that in a riveting way, completely dissapearing inside his character. But our next actor will have to be measured by Ledger's work, creating a distraction on the screen, having less screen time, and having to keep most of the previous actor's work for continuity sake.... gee, is possible.... but again, so is Santa Joker and his poo bags.