Toshihiko Seki, born on June 11, 1962, in Sendai, Miyagi Prefecture, Japan, is a celebrated Japanese voice actor, actor, singer, and narrator. He has been active in the entertainment industry since 1983 and is affiliated with 81 Produce, a prominent talent agency. Seki is known for his versatility, often voicing characters with serious or easily agitated personalities, such as Duo Maxwell in Mobile Suit Gundam Wing, Iruka Umino in Naruto, Kaien Shiba in Bleach and Riki in Ai no Kusabi. He has also portrayed deranged villains like Legato Bluesummers in Trigun and Muzan Kibutsuji in Demon Slayer: Kimetsu no Yaiba. One of his most iconic roles is Momotaros in Kamen Rider Den-O, a character he has reprised in numerous productions. In addition to his work in anime, Seki has contributed to video games, movies, and dubbing. His talent and dedication have earned him recognition, including being ranked as the 9th favorite voice actor in the 26th Annual Reader's Poll by Animage Magazine in 2004.

KNOWN FOR

Kamen Rider
2013
Bleach
2004
Ninja Boy Rantaro
1993
Naruto
2002
Ranma ½
1989
Hunter x Hunter
2012
Ranma1/2
2025
Naruto Shippūden
2007
Demon Slayer: Kimetsu no Yaiba Infinity Castle
2025
Mob Psycho 100
2019
Kaiju No. 8
2025
Golden Kamuy
2018

FILMOGRAPHY

All
Movies
TV
Acting
249
Sound
3
2026
Super Space Sheriff Gavan Infinity: Jo-Chaku Course
as Gavarion Trigger System Voice (voice)
2026
Chō Uchū Keiji Gyaban Infiniti Taiyō ga Naita Hi
as Cosmo Gavarion System Voice / Gavarion Trigger System Voice
2026
Ascendance of a Bookworm
as Eustachius (voice)
2026
PROJECT R.E.D.
as GavarionTrigger / CosmoGavarion (voice)
2026
My Ribdiculous Reincarnation
2025
Demon Slayer: Kimetsu no Yaiba Infinity Castle
as Muzan Kibutsuji (voice)
2025
Mashin Creator Wataru
as Mr. Liar (voice)
2025
U Takes Terra
as Chongyue (Voice)
2025
I Have a Crush at Work
as Pastor (voice)
2025
SANDA
as Hifumi Ōshibu (voice)
2025
Kaiju No. 8
as Kaiju No. 11 (voice)
2025
Ranma1/2
as Mousse (voice)
2024
Nintama Rantarō: Invincible Master of the Dokutake Ninja
as Hansuke Doi (voice)
2024
I Parry Everything
as Carew (voice)
2024
The Misfit of Demon King Academy
as Ahide Alobo Agatze (voice)
2024
Good Bye, Dragon Life
as Dio (voice)
2023
The Birth of Kitaro: The Mystery of GeGeGe
as Kitarou's Father (voice)
2023
Black Clover: Sword of the Wizard King
as Conrad Leto (voice)
2023
The Most Heretical Last Boss Queen: From Villainess to Savior
as Clark Darwin (voice)
2023
Rurouni Kenshin
as Narration (voice)
2023
Onimusha
as Kojiro Sasaki (voice)
2023
PLUTO
as Sahad (voice)
2023
PLUTO
as Pluto (voice)
2023
HIGH CARD
as Norman Kingstat (voice)
2022
Demon Slayer: Kimetsu no Yaiba - Asakusa Arc
as Muzan Kibutsuji (voice)
2022
Avataro Sentai Donbrothers meets Kamen Rider Den-O: Aim for it! The Don-O
as Momotaros (voice)
2021
My Hero Academia: World Heroes' Mission
as Eddie Soul (voice)
2021
Kamen Rider Saber + Kikai Sentai Zenkaiger: Super Hero Chronicles
as Momotaros (voice) / Kamen Rider Den-O (voice)
2020
Kamen Rider Den-O: The Birth of Pretty Den-O!
as Momotaros (voice)
2020
Higurashi: When They Cry - NEW
as Kyousuke Irie (voice)
2019
Demon Slayer: Kimetsu no Yaiba - Sibling's Bond
as Muzan Kibutsuji (voice)
2019
Mob Psycho 100
as Morizo Ebihara (voice)
2019
SAINT SEIYA: Knights of the Zodiac
as Scorpio Milo (voice)
2019
Sarazanmai
as Yuri Kamome
2019
Demon Slayer: Kimetsu no Yaiba
as Muzan Kibutsuji (voice)
2019
Star☆Twinkle PreCure
as Toto Hagoromo (voice)
2018
Kamen Rider Heisei Generations Forever
as Momotaros / Kamen Rider Den-O Sword Form (voice)
2018
Saint Seiya: Saintia Sho
as Scorpio Milo (voice)
2018
SWORD GAI: The Animation
as Miura Takuma
2018
Golden Kamuy
as Kazuo Henmi (voice)
2018
The Ryuo's Work is Never Done!
as Kiyotaki Kousuke (voice)
2018
To Be Hero
as Chinese Tohoku Muffler (voice)
2017
Saraba Kamen Rider Den-O: Special Event -Saraba Imagin! At Climax in the Entire Japan!!-
as Momotaros
2017
Mazinger Z: Infinity
as Tetsuya Tsurugi (voice)
2017
Kamen Rider × Super Sentai: Ultra Super Hero Wars
as Momotaros - Kamen Rider Den-O Sword Form (voice)
2017
The Laughing Salesman NEW
as Shisao Kihara(Story2)
2017
THE REFLECTION
as Michael Holden (voice)
2016
Naruto OVA 12: The Day Naruto Became Hokage
as Iruka Umino (voice)
2016
Mob Psycho 100
as Musashi Goda (voice)
2016
Descending Stories
as Eisuke Higuchi (voice)
2015
Mobile Suit Gundam: The Origin II - Artesia's Sorrow
as Char Aznable (voice)
2015
Saint Seiya: Soul of Gold
as Scorpio Milo (voice)
2014
Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai
as Kamen Rider Den-O Sword Form (voice)
2014
Space Dandy
as Public Prosecutor (voice)
2014
Cross Ange: Rondo of Angels and Dragons
as Embryo (voice)
2013
Higurashi: When They Cry - Outbreak
as Kyousuke Irie (voice)
2013
Hunter x Hunter: The Last Mission
as Wing (voice)
2013
Kamen Rider
as Kamen Rider Den-O (voice)
2013
Triple Combination: Transformers Go!
as Gekisōmaru (voice)
2013
声優戦隊ボイストーム7
as (voice)
2013
Gingitsune: Messenger Fox of the Gods
as Tatsuo Saeki (voice)
2012
Road to Ninja: Naruto the Movie
as Iruka Umino (voice)
2012
Kamen Rider × Super Sentai: Super Hero Wars
as Momotaros - Kamen Rider Den-O Sword Form (voice)
2012
Glitter Force
as Hiroshi Hoshizora
2012
Hunter x Hunter
as Wing (voice)
2012
Guilty Crown
as Kurosu Ouma (voice)
2011
OOO, Den-O, All Riders: Let's Go Kamen Riders
as Momotaros / Kamen Rider Den-O Sword Form (voice)
2011
Nintama Rantaro the Movie: Ninjutsu Academy - All Hands on Deck!
as Hansuke Doi (voice)
2011
OOO, Den-O, All Riders: Let's Go Kamen Riders: ~Let's Look! Only Your 48 Riders~
as Momotaros (voice)
2011
Detective Conan: Quarter of Silence
as Shogo Hikawa (voice)
2011
Saiyuki Gaiden
as Konzen Dōji (voice)
2011
Mobile Suit Gundam SEED HD Remaster
as Rey Za Burrel (voice), Rau Le Creuset (voice)
2010
Super Kamen Rider Den-O Trilogy - Episode Red: Zero's Star Twinkle
as Momotaros (voice)
2010
Super Kamen Rider Den-O Trilogy - Episode Blue: The Dispatched Imagin is Newtral
as Momotaros (voice)
2010
Super Kamen Rider Den-O Trilogy - Episode Yellow: Treasure de End Pirates
as Momotaros (voice)
2010
Kamen Rider Decade: Final Stage
as Momotaros / Kamen Rider Den-O (Sword Form)
2010
Kamen Rider × Kamen Rider × Kamen Rider The Movie Cho-Den-O Trilogy Movie Released Memorial Special Stage: Imagin Super Climax Tour 2010
2010
Psychic Detective Yakumo
as Isshin Saitō
2010
Katanagatari
as Umigame Maniwa (voice)
2009
Kamen Rider Decade: All Riders vs. Dai-Shocker
as Momotaros / Kamen Rider Den-O (voice)
2009
Kamen Rider × Kamen Rider W & Decade: Movie War 2010
as Kamen Rider Den-O (voice)
2009
Kamen Rider Kiva & Den-O: DenLiner, Into Space!
as Momotaros (voice)
2009
Saraba Kamen Rider Den-O: Special Event -Saraba Imagin! At Climax in the Entire Japan!!-
as Momotaros (voice)
2009
Super Kamen Rider Den-O & Decade NEO Generations: The Onigashima Warship
as Momotaros (voice)
2009
10th Anniversary Project: Masked Rider LIVE & SHOW
as Kamen Rider Den-O Sword Form (voice)
2009
Cookin' Idol Ai! Mai! Main!
as 柊修
2009
Dogs: Bullets & Carnage
as Ernst Rammsteiner
2008
Kamen Rider Den-O: Final Trilogy Special Edition
as Momotaros (voice)
2008
Kamen Rider Kiva: King of the Castle in the Demon World
as Penetentiary Officer Sanjo
2008
Kamen Rider Den-O & Kiva: Climax Deka
as Momotaros (voice)
2008
Farewell Kamen Rider Den-O: Final Countdown
as Momotaros (voice)
2008
Imagin Anime: Momotaros Forever!/Imajin Terminal Station
as Momotaros (voice)
2008
Momotaros' King of the Crimson Castle
as Momotaros (voice)
2008
Sekirei
as Hiroto Minaka
2008
Kamen Rider Den-O: Imagin Anime
as Momotaros (voice)
2008
A Certain Magical Index
as Aleister Crowley (voice)
2008
Blade of the Immortal
as Souri (voice)
2008
Momotaros' King of the Crimson Castle
as Momotaros (voice)
2007
Crayon Shin-chan Midsummer Night: I Have Arrived! The Storm is Called Den-O vs. Shin-O! 60 Minute Special!!
as Momotaros (voice)
2007
Kamen Rider Den-O The Movie: I'm Born!
as Momotaros (voice)
2007
Kamen Rider Den-O: Singing, Dancing, Great Training!!
as Momotaros (voice)
2007
Kamen Rider Den-O: Final Stage
as Momotaros
2007
Momotaros' Summer Vacation
as Momotaros (voice)
2007
Naruto Shippūden
as Iruka Umino (voice)
2007
Saiyuki Reload: Burial
as Genjō Sanzō (voice)
2007
Kamen Rider
as Momotaros (voice)
2007
Kamen Rider Den-O
as Momotaros (voice)
2006
Loving Angel Angelique
as Luva
2006
Higurashi: When They Cry
as Kyousuke Irie (voice)
2006
Shonen Onmyouji
2005
MÄR: Märchen Awakens Romance
as Danna Toramizu
2005
My-Otome
as Rad (voice)
2004
Paranoia Agent: Part 1
as まにわ みつひろ
2004
Samurai Champloo
as Yamane (voice)
2004
Paranoia Agent
as Mitsuhiro Maniwa (voice)
2004
My-Hime
as Reito Kanzaki (voice)
2004
Bleach
as Aaroniero Arruruerie (voice)
2004
Gin'yuu Mokushiroku Meine Liebe
as Ludwig Herzog von Mohn nahe Liechtenstein (voice)
2004
Mobile Suit Gundam SEED
as Rey Za Burrel (voice)
2003
Requiem from the Darkness
as Momosuke Yamaoka (voice)
2002
Animation Store Manager
as Ryuu Raiba (voice)
2002
Saiyuki Interactive
2002
Mirage of Blaze
as Takaya Ohgi (voice)
2002
Mobile Suit Gundam SEED
as Rau Le Creuset (voice)
2002
Naruto
as Iruka Umino (voice)
2002
Angelique: Twin Collection
as Luva (voice)
2002
Saint Seiya: The Hades Chapter
as Milo (voice)
2001
Saiyuki: Requiem
as Genjo Sanzo (voice)
2000
Reign: The Conqueror Movie
as Alexander
2000
Baby Felix & Friends
as Felix The Cat
2000
Descendants of Darkness
as Yutaka Watari (voice)
2000
Saiyuki
as Konzen Douji (voice)
2000
Saiyuki
as Genjo Sanzo (voice)
1999
Reign: The Conqueror
as Alexander (voice)
1999
Bビーダマン爆外伝V
as Kurobon
1999
Pet Shop of Horrors
as Count D (voice)
1999
Harlock Saga - The Ring of the Nibelungs
1998
Gundam Wing: The Endless Waltz
as Duo Maxwell (voice)
1998
TRIGUN
as Legato Bluesummers (voice)
1998
Bomberman B-Daman Bakugaiden
1998
Outlaw Star
as Fred (voice)
1998
Nightwalker: The Midnight Detective
as Bait
1997
Twilight of the Dark Master
as Shijo Tsunami (voice)
1997
Chimera: Angel of Death
as Ron (voice)
1997
Dragoon
as Rain Keeves Fearudo (voice)
1997
Hyper Police
as Sakunoshin Chikura
1997
B'T X
as Quatro (voice)
1997
Hakugei: Legend of the Moby Dick
1996
X
as Shougo
1996
The End of the Century Darling
as Todorokki Kouhei (voice)
1996
Yawara! Atlanta Special
1996
Violinist of Hamelin: The Movie
as Raiel (voice)
1996
Ultraman Super Fighter Legend
as Ultraseven / Ultraman Leo (voice)
1996
The Legend of Zorro
as Don Diego de la Vega / Zorro
1996
Special Duty Combat Unit Shinesman
as Shujin Seki (voice)
1995
Bio Hunter
as Komada
1995
Mobile Suit Gundam Wing
as Duo Maxwell (voice)
1995
Udauda Yatteru Hima wa Nee!
as (voice)
1994
I'm Not an Angel!
as Bunta Kouno (voice)
1994
Wild 7: Biker Knights
as Dairoku Hiba
1994
Genocyber
as Sakomizu (voice)
1994
Love Wedge 2
as Riki (voice)
1994
Dorami-chan: A Blue Straw Hat
as Crow (voice)
1994
The Irresponsible Captain Tylor: Tylor's War
as Ru Baraba Dom (voice)
1994
The Irresponsible Captain Tylor OVA
as Dom (voice)
1994
Natsuki Crisis
as Kyōtarō Himuro
1994
Wild 7
as Dairoku Hiba
1993
Ocean Waves
as Yutaka Matsuno (voice)
1993
Ninja Scroll
as Yurimaru (voice)
1993
Suikoden Demon Century
as Takateru Suga (voice)
1993
Kiss Me on the Apple of My Eye
as Naoto (voice)
1993
Ninja Boy Rantaro
as Hansuke Doi
1993
Aoki Densetsu Shoot!
as Akihiko Himuro (voice)
1993
The Irresponsible Captain Tylor
as Ru Baraba Dom
1993
Black Jack
as Tokio Umetani (voice)
1993
Please Save My Earth
as Mikuro Yakushimaru (voice)
1992
The Weathering Continent
as Tieh (voice)
1992
Download: Devil's Circuit
as Sid (voice)
1992
Yawara! Go Get 'Em, Wimpy Kids!!
as (voice)
1992
Oruorane the Cat Player
as The Cellist
1992
Calico Cat Holmes and the Lord of the Haunted Castle
as Yoshitaro Katayama (voice)
1992
Love Wedge 1
as Riki (voice)
1992
Ranma 1/2 the Movie 2: Nihao My Concubine
as Mousse (voice)
1992
Princess Army: Wedding Combat
as Yuuya Hashiba
1992
Ai no Kusabi
as Riki (voice)
1992
D-1 Devastator
as 谷田辺了
1992
Bastard!!
1991
Handsome Girl
as Ichiya Kumagai (voice)
1991
Nadia: The Secret of Blue Water - Nautilus Story II
as Fate (voice)
1991
Moonlight Pierce
as Hiroshi Takama (voice)
1991
Hisashi Eguchi's Kotobuki Goro Show
as Piston Akagi (voice)
1991
Ranma 1/2 the Movie: Big Trouble in Nekonron, China
as Mousse (voice)
1991
Inferious Interplanetary War Chronicle - Condition Green
as Soo Laform (voice)
1991
Yuukan Club
1991
Trusty Ginjiro
as Hideki Mitsui (voice)
1991
Nadia: The Secret of Blue Water - The Motion Picture
as Falt (voice)
1991
Future GPX Cyber Formula
as Jotaro Kaga
1991
Blazing Transfer Student
as Noboru Takizawa (voice)
1991
Izumo
as Izumo (voice)
1991
Here Is Greenwood
as Shinobu Tezuka (voice)
1991
Detonator Orgun
as Knock
1991
Legend of Heavenly Sphere Shurato: The Secret Feud of Creation
as Shurato
1991
Nyūin Bokki Monogatari Ojiji ni!
1991
Akai Hayate
1991
Flaming Rugby Boy: Dodge Danpei
as Nikaidou
1990
Marina the Manga Artist Goes to Camelot
as Bijomaru Shizuka (voice)
1990
TOKYO CITY Melhen 2
1990
Ryokunohara Labyrinth - Sparkling Phantom
as Hiroki Imashi
1990
Heart-Coloured Killer Ticket
as Chuta Misora (voice)
1990
Goddamn
as Hans Schultz
1990
Midoriyama High School, Koshien Edition (Movie)
1990
Milky Passion: Dougenzaka - The Castle of Love
as Ootsuki (voice)
1990
Nadia: The Secret of Blue Water
as Fejto (voice)
1990
The Hakkenden: Legend of the Dog Warriors
as Shino Inuzuka (voice)
1990
Goddamn
as Hans Schultz
1989
Cinderella Express
as Yuji Shimano
1989
Demon Hunter Makaryūdo
as Shou Kurogane (voice)
1989
Hades Project: Zeorymer Extinction
as Masato Akitsu / Masaki Kihara (voice)
1989
Angel Cop
as Tachihara (voice)
1989
Scarlet Demon
1989
Ranma ½
as Mousse (voice)
1989
Madö King Granzört
as Grunwald
1989
Armor Hunter Merowlink
as PFC Cepres
1989
Dash! Yonkuro
1989
Darkness of the Sea, Shadow of the Moon
as Katsuyuki Touma (voice)
1989
Shurato
as Shurato
1989
Yawara!
as Matsuda / Eiji (voice)
1989
Evil Dragon War Chronicles
as 錦繍 (voice)
1989
Nightsong of Splendor
1989
Star Cat Full House
1988
Dragon Century
as Carmine (voice)
1988
Zillion: Burning Night
as J.J. (voice)
1988
Balthus: Tia's Radiance
as Eud (voice)
1988
Hades Project: Zeorymer Separation
as Masato Akitsu (voice)
1988
Hades Project: Zeorymer Separation
as Masaki Kihara (voice)
1988
Sunlight All Around! Ka - su - mi: You Were in My Dreams
as Reporter B (voice)
1988
Kaze wo Nuke!
1988
Dragon Century
as Carmine
1988
Spirit Warrior
as Kujaku (voice)
1988
F
as Gunma Akagi (voice)
1988
Hades Project Zeorymer
as (voice)
1987
The Samurai
as Takeshi Chimatsuri
1987
TO-Y
as Shouji (voice)
1987
Maryuu Senki
1987
Campus Special Investigator Hikaruon
as Hikaru Shihodo / Hikaruon (voice)
1987
Zillion
as JJ
1986
Castle in the Sky
as Additional Voices (voice)
1986
Call Me Tonight
as Hayata (voice)
1985
Magical Emi, the Magic Star
as Customer A (voice)