
Quick answer — Jun Hazumi voices Roujin in Death Billiards, Ems Izuruha in Mobile Suit Gundam 0080: War in the Pocket, Zekkai in Sword of the Stranger and 2 more characters.
Jun Hazumi voices Roujin (Death Billiards), Ems Izuruha (Mobile Suit Gundam 0080: War in the Pocket), Zekkai (Sword of the Stranger), Juuzou Momota (Kemonozume), George Grimwood (Riding Bean).
Roujin is voiced in Japanese by Jun Hazumi.