Nightcrawler, Black Heart
I have demon fetish.
Ah finally someone else chooses Nightcrawler. He is my first choice, too. The actors they've had to play him are not hot, but the original comic book Nightcrawler is so damn sexy. I crushed on him all through middle school and high school when I read X-men and Excalibur.
I also have to give honorable mention to Beast. Another sexy one, also super smart and this one actually has a gorgeous actor in Nicholas Hoult.