well, other than the fact that he's a huge piece of shit and probably a terrible actor... but on a purely physical level? I've never seen a person who looked more like the comic book Joker in my entire life
(I don't actually want this to happen I'm just saying)
They should make a shitty conservative Joker where he is a racist and an incel, like the liberal moral panic around the Joker movie when it first came out. And then cast him in it.
There's a comic where The Joker finds out he's been working with Nazis and not just cartoonist supervillains using swastikas for shock value and kills en all immediately saying something along the lines of "I'm a murderous psychopath, not a genocidal bigot!"
That panel gets posted every once in a while. Unfortunately, I remember it being more cringe "I may be a criminal psychopath, but I am an American too!"