Zen Wistaria - Akagami no Shirayukihime
I am currently watching this and I'm not that far into it but I fell in love with this character right away he is so sweet, smart, brave and hot. I mean he has white hair what more can you want? He's a Prince and isn't afraid of anything!
Zero Kiryu - Vampire Knight
So Zero is super hot, a vampire, gray hair, uses a gun to kill vampire's and despises them even though he's one himself...
Then again I can think of some negatives such as he's a coward and afraid to say what he wants and take action. But I still like him!
My vote goes to Prince Zen all the way, he's perfect!