Jordan David might not be the most notable name on this list, but he is probably the most likely to be cast, given his slighter profile and the fact that he wouldn't stick out like a sore thumb as an important character. And he has shown in a brief flash that he would make a wonderful choice for the role, thanks to his appearance in American Horror Story: Murder House. The striking looking actor played Kevin Gedman during the series tribute to the columbine shootings, and his performance was tangibly creepy, successfully burrowing under the skin of the audience in a way that would translate impeccable across to a young version of the Joker. He also fits the profile established in the comics - he is tall without being towering, and his frame is slight, rather than hulking. Plus he's 23, which would fit nicely into the timeline of the new TV show, especially if the show draws on the origin story where he is an aspiring stand-up comic who turns to crime for the sake of his livelihood. Given his relatively low profile, David would no doubt be something of a gamble, but that also comes with benefits. If the show introduces the character early, without overtly hinting that he will become the Joker later, that would require the kind of lower profile actor who wouldn't attract undue, spoilerific attention by his very presence.