He's one of the (major) reasons I watched the series, aside from the endless kickass fights. At first, he was too 'pretty' for me but his intelligence and cunning, the love and devotion he has shown to his human mother made me interested. In time, the lovely features and flowing hair (be it crimson red / gray-white) I found "too pretty" became bonuses on this beautiful bishie. Part of his allure for me is his affinity with plants... I've always loved Mother Nature.
I fell in love with Kamui and Subaru from the X/1999 movie. I was attracted to Mamoru and Prince Diamond (I don't know his Japanese name ;_;) from Sailormoon, but the other two made me actually fan myself from hotness.
My very very first must have been Shiryu from Saint Seiya, an under appreciated reverse harem anime ;)
I know for sure who my most recent is though. I just finished watching Amatsuki episode 1: Shinonome - I think I'm in love ^^
My first one was either Byakuya, Urahara or Ukitake from Bleach. Don't ask me; although now I've got the hots for Aizen :)
I think I may of liked some guys in anime like Pokemon ages ago like most of you here, but I can't remember them well.