I don't usually do fancasting. For those wondering what that is: it's when you say you want this actor/actress to play a character in a movie or a tv show.
I don't fancast because I don't really have a good enough grasp on actors and I don't really care who plays who. Besides, sometimes someone you don't think will make a good Joker becomes one of the best incarnations of the character you have ever seen.
However, I have fancasted one actor for one role. This is one I will never budge on.
