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Acting
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.

Super Space Sheriff Gavan Infinity: The Day the Sun Cried
as Cosmo Gavarion System Voice / Gavarion Trigger System Voice

My Ribdiculous Reincarnation

Super Space Sheriff Gavan Infinity: Jo-Chaku Course
as Gavarion Trigger System Voice (voice)

PROJECT R.E.D.
as GavarionTrigger / CosmoGavarion (voice)

SANDA
as Hifumi Ōshibu (voice)

Demon Slayer: Kimetsu no Yaiba Infinity Castle
as Muzan Kibutsuji (voice)

U Takes Terra
as Chongyue (Voice)

Mashin Creator Wataru
as Mr. Liar (voice)

I Have a Crush at Work
as Pastor (voice)

Nintama Rantarō: Invincible Master of the Dokutake Ninja
as Hansuke Doi (voice)

Good Bye, Dragon Life
as Dio (voice)

Ranma1/2
as Mousse (voice)

I Parry Everything
as Carew (voice)

Kaiju No. 8
as Kaiju No. 11 (voice)

The Birth of Kitaro: The Mystery of GeGeGe
as Kitarou's Father (voice)

Onimusha
as Kojiro Sasaki (voice)

PLUTO
as Sahad (voice)

The Most Heretical Last Boss Queen: From Villainess to Savior
as Clark Darwin (voice)

Rurouni Kenshin
as Narration (voice)

Black Clover: Sword of the Wizard King
as Conrad Leto (voice)

HIGH CARD
as Norman Kingstat (voice)

Demon Slayer: Kimetsu no Yaiba - Asakusa Arc
as Muzan Kibutsuji (voice)

Avataro Sentai Donbrothers meets Kamen Rider Den-O: Aim for it! The Don-O
as Momotaros (voice)

My Hero Academia: World Heroes' Mission
as Eddie Soul (voice)

Kamen Rider Saber + Kikai Sentai Zenkaiger: Super Hero Chronicles
as Momotaros (voice) / Kamen Rider Den-O (voice)

Higurashi: When They Cry - NEW
as Kyousuke Irie (voice)

Kamen Rider Den-O: The Birth of Pretty Den-O!
as Momotaros (voice)

The Misfit of Demon King Academy
as Ahide Alobo Agatze (voice)

SAINT SEIYA: Knights of the Zodiac
as Scorpio Milo (voice)

Sarazanmai
as Yuri Kamome

Demon Slayer: Kimetsu no Yaiba
as Muzan Kibutsuji (voice)

Demon Slayer: Kimetsu no Yaiba - Sibling's Bond
as Muzan Kibutsuji (voice)

Star☆Twinkle PreCure
as Toto Hagoromo (voice)

Kamen Rider Heisei Generations Forever
as Momotaros / Kamen Rider Den-O Sword Form (voice)

Saint Seiya: Saintia Sho
as Scorpio Milo (voice)

Golden Kamuy
as Kazuo Henmi (voice)

SWORD GAI: The Animation
as Miura Takuma

The Ryuo's Work is Never Done!
as Kiyotaki Kousuke (voice)

Mazinger Z: Infinity
as Tetsuya Tsurugi (voice)

Saraba Kamen Rider Den-O: Special Event -Saraba Imagin! At Climax in the Entire Japan!!-
as Momotaros

THE REFLECTION
as Michael Holden (voice)

The Laughing Salesman NEW
as Shisao Kihara(Story2)

Kamen Rider × Super Sentai: Ultra Super Hero Wars
as Momotaros - Kamen Rider Den-O Sword Form (voice)

To Be Hero
as Chinese Tohoku Muffler (voice)

Mob Psycho 100
as Morizo Ebihara (voice)

Naruto OVA 12: The Day Naruto Became Hokage
as Iruka Umino (voice)

Showa Genroku Rakugo Shinju
as Eisuke Higuchi (voice)

Mobile Suit Gundam: The Origin II - Artesia's Sorrow
as Char Aznable (voice)

Saint Seiya: Soul of Gold
as Scorpio Milo (voice)

Cross Ange: Rondo of Angels and Dragons
as Embryo (voice)

Heisei Rider vs. Showa Rider: Kamen Rider Wars feat. Super Sentai
as Kamen Rider Den-O Sword Form (voice)

Space Dandy
as Public Prosecutor (voice)

Hunter x Hunter: The Last Mission
as Wing (voice)

Gingitsune: Messenger Fox of the Gods
as Tatsuo Saeki (voice)

声優戦隊ボイストーム7
as (voice)

Higurashi: When They Cry - Outbreak
as Kyousuke Irie (voice)

Triple Combination: Transformers Go!
as Gekisōmaru (voice)

Road to Ninja: Naruto the Movie
as Iruka Umino (voice)

Kamen Rider × Super Sentai: Super Hero Wars
as Momotaros - Kamen Rider Den-O Sword Form (voice)

Glitter Force
as Hiroshi Hoshizora