
Quick answer — Eiji Maruyama voices Wiseman in Sailor Moon R, Duke Preminger in Ashita no Nadja, Saman in The Slayers and 7 more characters.
Eiji Maruyama voices Wiseman (Sailor Moon R), Duke Preminger (Ashita no Nadja), Saman (The Slayers), Bloody (Yes! Precure 5), Rou Shinpu (Hakkenden: Eight Dogs of the East), Yuuto (Sunday Without God), Isurugi (Dance in the Vampire Bund), Grandfather Haimura (The Severing Crime Edge) and 2 more.
Wiseman is voiced in Japanese by Eiji Maruyama.