
Quick answer — Tetsu Shiratori voices Kouji Aiba in Infinite Ryvius, Lloyd Asplund in Code Geass: Lelouch of the Rebellion, Kain Fuery in Fullmetal Alchemist and 9 more characters.
Tetsu Shiratori voices Kouji Aiba (Infinite Ryvius), Lloyd Asplund (Code Geass: Lelouch of the Rebellion), Kain Fuery (Fullmetal Alchemist), Robert Beauchamp (Gankutsuou: The Count of Monte Cristo), Kon Kurimiya (Free! -Dive to the Future-), Gyuran (Reincarnated as a Sword), Sai Argyle (Mobile Suit Gundam Seed), Kyoji Mujo (s-CRY-ed) and 4 more.
Kouji Aiba is voiced in Japanese by Tetsu Shiratori.