Yes the joker has a clown motif. It's really the only consistent thing about him. It's one of the things that makes him so timeless. Under the paint the joker can be portrayed a million different ways. Nicholson's joker was about gags, he wanted to put a smile on everybody's face. With Ledger's joker, everything was calculated, including the paint. For him it was all about the joke, civilization is a lie. Yes they both had a clown motif and they fought guys with bat motifs, but that is where the similarities end. I didn't know Burton had anything to do with the animated shows. Hamil's joker really runs all over the place. Part of the nature of the media I imagine.