Hummm this one's though, silver hair AND a charmer.
I automatically thought of Sesshomaru from InuYasha. Don't let his bad guy personality fool you, he's really quite sweet to the little girl he protects, Rin. When he started really caring for her that's when he 'charmed' me and made him my kegemaran InuYasha character.
Seiran from Saiunkoku Monogatari. He's a guy who has a mysterious past and is really protective of the main character girl. He's not a charmer in sense he's a 'ladies man' but in the sense he is so strong, graceful, and sweet.
(pictured below) gin from Hotarubi no Mori e (anime movie) has got to be my ultimate charmer. Mysterious, calm, cool, sweet, and 'out of reach.'