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Under the name Yamaguchi Kappei:
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| Enoki Tatsuya | Aka-chan to Boku (1996/07/11-1997/03/26 TV) |
| Masaomi | Aka-chan to Boku (1996/07/11-1997/03/26 TV) |
| Crane Bahnsteig/The White Prince | Akihabara Dennohgumi -CYBER TEAM in AKIHABARA- [On-Air Version] (1998/04/04-1998/09/26 TV) |
| Male Student (ep.7) | Akihabara Dennohgumi -CYBER TEAM in AKIHABARA- [On-Air Version] (1998/04/04-1998/09/26 TV) |
| Crane Bahnsteig/The White Prince | Akihabara Dennohgumi -CYBER TEAM in AKIHABARA- [Retake/LD/DVD Versions] (TV) |
| Male Student (ep.7) | Akihabara Dennohgumi -CYBER TEAM in AKIHABARA- [Retake/LD/DVD Versions] (TV) |
| <Guy with Boombox> (ep.16) (Uncredited) | Akihabara Dennohgumi -CYBER TEAM in AKIHABARA- [Retake/LD/DVD Versions] (TV) |
| <Soldier talking about communication and scouting squads suspended> (ep.23) (Uncredited) | Akihabara Dennohgumi -CYBER TEAM in AKIHABARA- [Retake/LD/DVD Versions] (TV) |
| Crane Bahnsteig | Akihabara Dennohgumi - 2011 Nen no Natsuyasumi [Cyber Team in Akihabara: The Movie] (1999/08/14 Movie) |
| ???? | Anbot ???? Goku |
| Hamura Syou | Angel's Feather (OVA) |
| 怪々丸 (Story 2) | Ayakashi ~ayakashi~ (2006/01/12-2006/03/23 TV) |
| ???? | BACCANO! -Bakkano!- (2007/07/26-2007/11/01 TV) |
| 麻生拓也 | BADBOYS5 (1998 OVA) |
| Aono Keita | Betterman (1999/04/01-1999/09/30 TV) |
| Mireo | BLUE REMAINS (Movie) |
| Araiguma-kun | Bonobono - Kumomo no Ki no Koto (2002/08/10 Movie) |
| ???? | BRONZE -ZETSUAI since 1989- (OVA) |
| Vilem | Captain Tsubasa (2001/10/07-2002/10/06 TV) |
| Kabuto Kouji | CB Kyara - Nagai Gou World [Chibi Chara - Nagai Gou World] (1990-1991 OVA) |
| Higashikumaru Kentarou | CLAMP Gakuen Tantei Dan (TV) |
| Male Awakened One 3 [Giant-type] (ep.18-19) | CLAYMORE (2007/04/03-2007/09/25 TV) |
| Umeda Yoshio | COOKING PAPA (1992/04/09-1995/05/25 TV) |
| Ueda Yasumi | COOKING PAPA (1992/04/09-1995/05/25 TV) |
| <Current boyfriend of Jet's old girlfriend> | Cowboy Bebop (TV) |
| Oikawa Hikorou | DearS (2004/07/10-2004/09/25 TV) |
| L (Eru) | DEATH NOTE (TV) |
| Chuumon (ep.10,40) | Digimon Adventure (1999/03/07-2000/03/26 TV) |
| Serios | Dragon Slayer |
| Yorun | Eden's Bowy (TV) |
| Flappy | Eiga - Futari wa Precure Splash Star Chiku Taku Kiki Ippatsu! (2006/12/09 Movie) |
| Flappy | Eiga - Precure All-Stars DX - Minna Tomodachi!*Kiseki no Zenin Daishuugou! (2009/03/20 Movie) |
| Bisu | FREEDOM (2006/11/17-2008/05/16 OVA) |
| Yamada Taku | Futari Ecchi 2nd SEASON (2003/11/27-2004/01/22 OVA) |
| Flappy | Futari wa Precure Splash Star (2006/02/05-2007/01/28 TV) |
| Classmate (ep.38) | Futari wa Precure Splash Star (2006/02/05-2007/01/28 TV) |
| Senju Hakaru | GALLERY FAKE (2005/01/08-2005/09/24 TV) |
| Nopperabou | Ge Ge Ge no Kitarou (1996-1998 (4th) version) |
| Kusama Daisuke | Giant Robo THE ANIMATION (OVA) |
| Yamaguchi Tsutomu | Gokinjo Monogatari (1995/09/10-1996/09/01 TV) |
| <Singer in Nittle Grasper> | Gravitation (TV) |
| Yamada Hanappe | Hanappe Bazooka (1992/09/04 OVA) |
| Inu Yasha | Inu Yasha (TV) |
| Inu Yasha | Inu Yasha ???? (Movie 1) |
| Inu Yasha | Inu Yasha ???? (Movie 2) |
| Inu Yasha | Inu Yasha ???? (Movie 3) |
| Inu Yasha | Inu Yasha ???? (Movie 4) |
| Rokuta | Juuni Kokuki (2002 TV) |
| Hugh | Kiba -KIBA- (2006/04/02-2007/03/25 TV) |
| Sai Sici | Kidou Butouden G Gundam (TV) |
| Misaki Ryou (ep.8,26) | Kidou Tenshi Angelic Layer (TV) |
| Tombo | Kiki's Delivery Service (Movie) |
| Little Zenki | Kisshin Douji Zenki (TV) |
| Koizumi Tenma | Koko wa Greenwood [HERE IS GREENWOOD] (1991/11/22-1993/03/26 OVA) |
| 張遼文遠 | Koutetsu Sangokushi (2007/01/06-2007/12/29 TV) |
| Yattarou | Kyatto Ninden Teyandee (TV) |
| Nin Nin | La Blue Girl |
| Yoshida Tarou | Mahou no Stage Fancy Lala (1998/04/05-1998/09/27 TV) |
| Washio Masakatsu | Majin Tantei Nougami Neuro (2007/10/02-2008/03/25 TV) |
| Hanada 英夫 | Mama wa Shougaku 4 Nensei (1992/01/10-1992/12/25 TV) |
| Noda Yuuya | Miracle*Girls (1993/01/08-1993/12/24 TV) |
| 無音宙太 | MOUSE (2003 TV) |
| Rene | Neo Angelique Abyss - Second Age (2008/07/07 TV) |
| Suke Banji (女 蛮子) | Oira Sukeban (1992/08/21 OVA) |
| Usopp | ONE PIECE (TV) |
| Yamaguchi Tsutomu | Paradise Kiss (2005/10/13-2005/12/29 TV) |
| Nagakura Shinpachi | PEACEMAKER Kurogane (TV) |
| Tooru (ep.55-57,187-189) | Pocket Monster (TV) |
| Parasect | Pocket Monster - Pikachuu Tankentai (Short Movie 2) |
| Balbeet | Pocket Monster - Pika Pika Hoshizora Camp (Short Movie 5) |
| Saotome Ranma (Male) | Ranma 1/2 - Chuugoku Nekonron Daikessen! Okite Yaburi no Gekitou Hen!! (Movie 1) |
| Saotome Ranma (Male) | Ranma 1/2 - Kessen Tougenkyou! Hanayome wo Tomimodose!! (Movie 2) |
| Saotome Ranma (Male) | Ranma 1/2 - Chou Musabetsu Kessen! Ranma Team VS Densetsu no Houou (Movie 3) |
| Saotome Ranma (Male) | Ranma 1/2 (OVA) |
| Saotome Ranma (Male) -Anime Debut Role | Ranma 1/2 (TV) |
| Saotome Ranma (Male) | Ranma 1/2 Special Yomigaeru Kioku (OVA) |
| Saotome Ranma (Male) | Ranma 1/2 SUPER (OVA) |
| Kurenai Ken | Red Baron (1994/04/05-1995/03/28 TV) |
| Another Person Ken | Red Baron (1994/04/05-1995/03/28 TV) |
| Katori Ishimatsu | Ring ni Kakero [Manga DVD] (2003/10/03 OVA) |
| Ryuuou | Seiden -RG VEDA- (1991/06/01-1992/06/21 OVA) |
| ???? | Seirei no Moribito (TV) |
| Low | Shadow Skill -Kage Waza- (TV) |
| Tochirou | Space Symphony Maetel (Prologue to Galaxy Express 999) (2004 OVA) |
| Tasuku Shinguuji | Super Robot Taisen ORIGINAL GENERATION DIVINE WARS (TV) |
| Tasuku Shinguuji | Super Robot Taisen ORIGINAL GENERATION DIVINE WARS [Last Episode] (OVA) |
| Bettou (ep.2) | Takahashi Rumiko Gekijou (2003 TV) |
| Minoru (ep.3) | Takahashi Rumiko Gekijou (2003 TV) |
| Aizaki (ep.5) | Takahashi Rumiko Gekijou (2003 TV) |
| Shesta (ep.3,5-6,9,13-14) | Tenkuu no Escaflowne (TV) |
| ???? (ep.3) | The Cockpit (OVA) |
| Inukawa Sousuke (Gakuzou) | THE Hakkenden |
| Rakosupo | To LoveRu -Toraburu- (2008/04/03-2008/09/25 TV) |
| Souya Hideyoshi | Ueki no Housoku - The Law of Ueki (2005/04-2006/03 TV) |
| Tenma Saburou | Violence Jack HELL'S WIND-hen (1990/11/09 OVA) |
| Izumi Sena | Weiss Kreuz Gluhen (TV) |
| Utsumi Rai/ThunderRai | Yuusha Shirei Dagwon (1996/02/03-1997/01/25 TV) |
| Ninniku | Zoku Zoku Mura no Obaketachi (1) |
| Passari | Zoku Zoku Mura no Obaketachi (2) |
