Robert Martin Klein (also known as R. Martin Klein or Bob Klein) is a voice actor who went under the alias name Bob Marx in his earlier dubbing work during the '90s. He's best known for playing Me-Mania in Perfect Blue, Gomamon/Ikkakumon in Digimon: Digital Monsters, Fukurou in Noein & Katsuhiko Jinnai in El Hazard.
Battle B-Daman - The Big Cheese, Additional Voices
Blue Dragon - Marumaro
Cyborg 009 - Ivan Whisky/Cyborg 001
Digimon: Digital Monsters - Bukamon/Gomamon/Ikkakumon (Adventure-Adventure 02), Toshiaki Mori (Tamers), Additional Voices
Digimon Fusion - Archelomon, Bukamon
Eagle Riders - Mallanox
El Hazard - Katsuhiko Jinnai
FLCL - Gaku
Flint the Time Detective - Flint Hammerhead
Giant Robo - Additional Voices
Gatchaman - Solaris
Hand Maid May - Kotaro Nanbara
Hyper Doll - Kurageman
Magical Meow Meow Taruto - Kakipi
MÄR - Pozan
Mirmo! - Kororo
Mobile Suit Gundam: The 08th MS Team - Jidan Nickard
Mon Colle Knights - Impy, Additional Voices
Noein - Fukurou
Perfect Blue - Me-Mania
Zatch Bell! - Grisor
Animalia - Iggy D'Iguana, Horble, Zed, Additional voices
Dwegons - Nosey Three Horn, Bloochip, Squats
LeapFrog - Edison the Firefly (5 DVDs, as "Robert Mark Klein")
Lego Star Wars: The Padawan Menace - Chancellor Palpatine, Darth Sidious, Republic Guard
Power Rangers in Space - Seymour (voice, uncredited)
A Martian Christmas - Office Manager, Martian Officer (as "Robert Mark Klein")
Digimon: The Movie - Gomamon
Meet the Fockers - Moe Focker (DVD Extended)
Digimon Adventure tri. - Bukamon/Gomamon/Ikkakumon/Zudomon/Vikemon (as "Bob Klein")
.hack - Harald Hoerwick, Marlo, Noble Grunty
Brave Fencer Musashi - Butler Livers, Scribe Shanky
Bushido Blade 2 - Katze
Digimon Rumble Arena 2 - Gomamon/Ikkakumon, Veemon
Digimon All-Star Rumble - Gomamon, Plesiomon
Dynasty Warriors 4 - Lu Meng, Guo Jia
Dynasty Warriors 4: Empires - Lu Meng, Guo Jia
Dynasty Warriors 4: Xtreme Legends - Lu Meng, Guo Jia
Grandia III - Pilot
Paraworld - Trader
Radiata Stories - Al, Ganz Rothschild
Samurai Warriors - Ieyasu Tokugawa
Samurai Warriors: Xtreme Legends - Ieyasu Tokugawa
Star Ocean: First Departure - Lias Warren
Star Ocean: Till the End of Time - Norton
The Bouncer - Mugetsu