
Quick answer — Tadahisa Saizen voices Rikichi in Samurai 7, Heracles in Fate/stay night: Unlimited Blade Works, Maguruma Gouzou in GetBackers and 4 more characters.
Tadahisa Saizen voices Rikichi (Samurai 7), Heracles (Fate/stay night: Unlimited Blade Works), Maguruma Gouzou (GetBackers), Kudoh (Appleseed (Movie)), Vargas (MoonPhase), Tenma Ganzo (Grenadier: The Beautiful Warrior), Tatsuo Toue (DRAMAtical Murder).
Rikichi is voiced in Japanese by Tadahisa Saizen.