
Quick answer — Atsushi Kisaichi voices Aoba Seragaki in DRAMAtical Murder, Nagata in Code Geass: Lelouch of the Rebellion, Kiyotsugu Togawa in Ave Mujica - The Die is Cast - and 12 more characters.
Atsushi Kisaichi voices Aoba Seragaki (DRAMAtical Murder), Nagata (Code Geass: Lelouch of the Rebellion), Kiyotsugu Togawa (Ave Mujica - The Die is Cast -), Colin Clifford (Planetes), Hideaki Asaba (His and Her Circumstances), Yoshirou Hamada (Big Windup!), Hakumei Heki (The Story of Saiunkoku), Kazushi Miyamoto (Persona 3 the Movie: #3 Falling Down) and 7 more.
Aoba Seragaki is voiced in Japanese by Atsushi Kisaichi.