
Quick answer — Ryuuji Nakagi voices Ratchman in Black Lagoon, Gouzou Yuutenji in YAWARA! a fashionable judo girl!, Electryon in Appleseed (Movie).
Ryuuji Nakagi voices Ratchman (Black Lagoon), Gouzou Yuutenji (YAWARA! a fashionable judo girl!), Electryon (Appleseed (Movie)).
Ratchman is voiced in Japanese by Ryuuji Nakagi.