Wow this is hard to decide,
For the guys: Allen Walker (D. Gray Man), Shizuo Heiwajima (Durarara!!), Himura Kenshin (Rurouni Kenshin), Lelouch (Code Geass)

For the girls: Asuna, Inori (Guilty Crown), Aika Fuwa (Zetsuen no Tempest)

Too hard to just say one person!