
Quick answer — Hidehiro Kikuchi voices Souzou Sagara in Rurouni Kenshin, Atsushi Tezuka in City Hunter 2, Seinen in Night on the Galactic Railroad and 1 more characters.
Hidehiro Kikuchi voices Souzou Sagara (Rurouni Kenshin), Atsushi Tezuka (City Hunter 2), Seinen (Night on the Galactic Railroad), Daniel (Sorcerer Hunters).
Souzou Sagara is voiced in Japanese by Hidehiro Kikuchi.