
Quick answer — Mikio Terashima voices Gunman in Galaxy Express 999, Oji-san in Yokohama Shopping Log, Asuka Kyouju in Devilman: The Birth and 2 more characters.
Mikio Terashima voices Gunman (Galaxy Express 999), Oji-san (Yokohama Shopping Log), Asuka Kyouju (Devilman: The Birth), Leslie Arno (Mobile Suit Gundam F91), Masumi Hirakawa (Angel Cop).
Gunman is voiced in Japanese by Mikio Terashima.