![[Image: jokercosplay_zpsdfea9196.jpg]](http://i293.photobucket.com/albums/mm50/Norgarth/jokercosplay_zpsdfea9196.jpg)
I can't help but think that this guy bares a bit of a resemblance to David Tenant (10th Doctor), which brought to mind the idea that the Joker is a Timelord. It would explain how he keeps coming back from certain death as well as some of the different personality variants he's had over the years.
Edit to add: even his name sorta fits as a Timelord.
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"I've always wanted to be somebody, but I should have been more specific." - George Carlin