Quick answer — Masashi Hirose voices Risei Kotomine in Fate/Zero, Shelby M. Penwood in Hellsing Ultimate, Kiyoji Nakano in Lovely Complex and 18 more characters.
Masashi Hirose voices Risei Kotomine (Fate/Zero), Shelby M. Penwood (Hellsing Ultimate), Kiyoji Nakano (Lovely Complex), Baresto Rosita (Mobile Suit Gundam: The 08th MS Team), Ramba Ral (Mobile Suit Gundam), Stinger (Getter Robo: Armageddon), Yuzo Takaya (Gunbuster), Akihiro Takamine (Paranoia Agent) and 13 more.
Risei Kotomine is voiced in Japanese by Masashi Hirose.
