
Quick answer — Ryuusuke Oobayashi voices Kiichi Gotou in Mobile Police Patlabor, Fritz Vardemann in Monster, Roberto in Romeo's Blue Skies and 10 more characters.
Ryuusuke Oobayashi voices Kiichi Gotou (Mobile Police Patlabor), Fritz Vardemann (Monster), Roberto (Romeo's Blue Skies), Yasuo Iwakura (Serial Experiments Lain), Diego Lovelace (Black Lagoon: Roberta's Blood Trail), Exsedol Folmo (Macross), Shinpachirou Munakata (Shigurui: Death Frenzy), Flide (Heavy Object) and 5 more.
Kiichi Gotou is voiced in Japanese by Ryuusuke Oobayashi.