Seki Toshihiko roles (anime)
Toshihiko has done the following roles in anime.
| Ai no Kusabi | Riki |
| Akai Hayate | Nagase Jun |
| Alexander Senki/Reign | Alexander |
| Angel Cop [1989-1994] | Tachihara |
| Antique Heart (Gakuen Benriya Series) [1998] | Honda Takahiro |
| Ao no 6 Go [1998-2000] | Nonaka Katsuma |
| Area 88 TV [2004] | Mickey Simon |
| Armor Hunter Mellowlink | Sepres |
| B'T X {Neo} | Quatro |
| B.B | Sorry |
| Babel II (OAV) | Nicola |
| Baby Felix [2000] | Felix |
| Bastard! | Karu Su |
| Bio Hunter | Komada |
| Black Jack [1995] | Umetani Tokio |
| Bleach | Shiba Kaien |
| Buttobi CPU | Master |
| Call Me Tonight | Hayata |
| City Hunter {2} | Takao |
| City Hunter {2} | Kazuya |
| CLAMP Gakuen Tanteidan {Episode 1} | husband |
| Demon Hunter | Tetsuo |
| Detonator Orgun | Nokku |
| Devastator | Yatabe Ryo |
| Dodge Danpei | Nikaidou |
| Dragon Century | Carmine |
| Dragoon | Lane |
| Evangelion | Asuka's father |
| F | Gunma |
| Fantasy Adventure Nagagutsu wo haita neko no bouken | christopher |
| Final Fantasy: Unlimited [2001] | Sid |
| Flag! | Nobel |
| Full Metal Alchemist (Hagane no Renkinjutsushi) | Vercio |
| Fushigi no Umi no Nadia | Feito |
| Fuuma no Kojiro | Reira |
| Genesis Surviver Gaiarth | General |
| Gensou Maden Saiyuuki [2000] | Genjou Sanjou |
| Girl Friend (kari) [2014] | Kokomi's father |
| Goddamn | Hans |
| Granzort | Grunwald |
| Groove Adventure Rave | Shuda |
| Gundam Wing | Duo Maxwell |
| Gundam Wing Endless Waltz [1997] | Duo Maxwell |
| Hakkenden OAV [1990-1991] | Inuzuka Shino |
| Hakugei Densetsu [1997] | Dew |
| Hameln no Violin Hiki (movie) | Raiel |
| Handsome na Kanojo | Kumagai Ichiyo |
| Haou Taikei Ryuu Knight {Adieu's Legend FINAL} | Hitteru |
| Harlock Saga: The Ring of the Nibelung [1999] | Daiba Tadashi |
| Haunted Junction | Haruto's father |
| Higurashi no Nakukoroni Kai [2007] | Irie Kyousuke |
| Hikaruon | Hikaru |
| Idol Tenshi Youkoso Yoko | Hayami Ryou |
| Izumo [1991] | Izumo |
| Juubei Ninpouchou (Ninja Scroll) | Yurimaru |
| Juubei Ninpouchou (Ninja Scroll) (TV) [2003] | Aizen |
| Karura Mau [1989] | Shinguuji |
| Katana Gatari [2010] | Maniwa Umigame |
| Kaze wo nuke! | Ryuuichi |
| Kiddy Grade [2002-2003] | Franz |
| Kidou Senshi Gundam Seed [2002] | Rau La Cruz |
| Kill la Kill [2013] | Senketsu |
| Kimetsu no Yaiba [2019] | Kibutsuji Muzan |
| Kindaichi Shounen no Jikenbo | Naoto |
| Koko ha Greenwood | Tezuka Shinobu |
| Kousetsu Hyaku Monogatari | Yamaoka Momoyuki |
| Kruel 1999 | Juurou |
| Kujaku-Oh | Kujaku |
| Legend of Crystania | Nursel |
| Legend of Crystania: The Chaos Ring | Narsel |
| Mirage of Blaze | Ohgi Takaya |
| Moonlight Pierce Yumemi & Silver Rose Knights [1991] | Takama Hiroshi |
| Musekinin Kanchou Tylor | Dom |
| Naruto | Iruka |
| Natsuki Crisis | Himuro Kyoutarou |
| Nightwalker | Beito |
| Nintama Rantarou | Doi-sensei |
| Noir [2001] | Milosc Havel |
| Odaijini | Yamashita |
| Oi! Ryouma | Sakamoto Ryuuma |
| Oishinbo {Episode 1} | employee B |
| Ore Twintail ni Narimasu [2014] | Fox Guildy |
| Outlaw Star | Fred |
| Outlaw Star | Ark |
| Paranoia Agent | Maniwa |
| Parasol Henbee [1989-1991] | Katabutsu |
| Pet Shop of Horror | Count D |
| Please Save My Earth | Yakushimaru Mikuro |
| Pollyanna | young John |
| Princess Army | Hashiba Yuuya |
| RahXephon [2002] | Isshiki Makoto |
| Ranma 1/2 [1989-1992] | Mousse |
| Rave [2001] | Shuda |
| Ryokunohara Labyrinth | Imanishi Hiroki |
| Ryuuki Denshou | Rain |
| Ryuuou no Oshigoto! [2018] | Kiyotaki Kousuke |
| Saint Seiya [1985-1989] | Fenril |
| Saiyuuki Reload [2003] | Genjou Sanjou |
| Saiyuuki Reload Gunlock [2004] | Genjou Sanjou |
| Samurai Champloo [2004] {Ep. 9} | checkpoint chief (young) |
| Samurai Deeper Kyo | Benitora |
| Samurai: Hunt for the Sword | Chimatsuri |
| Shihaisha no Tasogare | Shijo Tsunami |
| Shinseiki GPX Cyber Formula | Breed Kaga |
| Shouwa Genroku Rakugo Shinjuu Sukeroku Futatabihen [2017] | Higuchi |
| Shurato | Shura-Oh Shurato (Hidaka Shurato) |
| Silent Mobius (TV) [1998] | Genvara |
| The Soul Taker: Tamashiigari | Kyoya |
| Starcat Full House | Seitarou |
| To Aru Majutsu no Index [2008-2011] | Aleister Crowley |
| To Aru Majutsu no Index Endymion on Kiseki [2013] | Aleister Crowley |
| To-Y | Shouji |
| Tokumu Sentai Shinesman | Seki Shujin |
| Touch [1985-1987] [debut] | Fujimoto |
| Touch [1985-1987] {3} | Nakajima |
| Transfer Student of Fire | Takisawa Noboru |
| Trigun [1998] | Legato Bluesummers |
| Twilight of the Dark Master | Shijo Tsunami |
| Umi ga Kikoeru | Matsuno Yutaka |
| Umi no Yami Tsuki no Kage | Touma Katsuyuki |
| The Weathering Continent [1992] | Tieh |
| Wedding Peach {Episode 11} | Tanma |
| Wild 7 | Hiba |
| X (movie) [1996] | Shougo |
| Yami no Matsuei [2000] | Watari Yutaka |
| Yawara! | Matsuda Kousaku |
| Youseiki Suikoden | Suga Takateru |
| Yuugen Kaisha (Phantom Quest Corps) | Mukyou |
| Yuugen Kaisha (Phantom Quest Corps) | Hakyo |
| Yuukan Club | Shouchikubai Miroku |
| Zeorymer | Masato |
| Zillion | JJ |