The one I'd be closest to being in love with is one I created, a vampire/fairy/succubus/blood goddess who's the main character of the book trillogy I'm about to start writing. I can show you some pictures that I created by making her in the Sims 2, and a lot of downloads...heh heh. XD
Um, as for non-custom made ones, I'm most certainly not in love with any of them, not even "crushes." But the ones I'd be attracted to if they existed in the real world would be:
-Fall-from-grace from the game "Planescape: Torment." A deep, philosophical, and compassionate succubus that, despite being "reformed," retains all her attractiveness. I really wish more could have been done with her character, because I kept her in my party just for the conversations even though she was kind of useless during combat. I dunno, I have a soft spot for succubi...
-Selene from the "Underworld" films. I have to say though that I'd be a little afraid of her killing me, though.
-Death from the "Sandman" graphic novels (dislike her hair, but her personality's just wonderful)
-Alice from the game "American McGee's Alice"--no, there's no pedophilia here, because in that one she's in her late teens (I'm 18, so, yeah). I might be scared of her killing me, too, actually.
-Um...many of the lovely fairies featured in the paintings of http://www.furiae.com/
Um...if anyone wants to see the images of the character, lemme know. I've already described her under the "Dream girls/dream dudes" thread I made a while back in the mature boards. Heh.