Koji Seki

Acting

Koji Seki

Born November 25, 1982Saitama, Japan36 credits

Koji Seki (関 幸司, Seki Kōji, born November 25, 1982) is a Japanese voice actor from Saitama Prefecture who is affiliated with Raccoon Dog. He graduated from Pro-Fit Voice Actor Training School and joined the agency Pro-Fit. On April 1, 2022, he transferred to Raccoon Dog.

Known For

You and I Are Polar Opposites
8.5

You and I Are Polar Opposites

TV

2026

Inexpressive Kashiwada and Expressive Oota
7.3

Inexpressive Kashiwada and Expressive Oota

TV

2025

Solo Camping for Two
7.6

Solo Camping for Two

TV

2025

Turkey! Time to Strike
7.2

Turkey! Time to Strike

TV

2025

Welcome to the Outcast's Restaurant!
7.5

Welcome to the Outcast's Restaurant!

TV

2025

Summer Pockets
7.2

Summer Pockets

TV

2025

Filmography

You and I Are Polar Opposites
2026You and I Are Polar Oppositesas Convenience Store Manager (voice)TV
Inexpressive Kashiwada and Expressive Oota
2025Inexpressive Kashiwada and Expressive Ootaas Mathematics Teacher (voice)TV
Solo Camping for Two
2025Solo Camping for Twoas Izakaya Manager (voice)TV
Turkey! Time to Strike
2025Turkey! Time to Strikeas Samurai (voice)TV
Welcome to the Outcast's Restaurant!
2025Welcome to the Outcast's Restaurant!as Merchant (voice)TV
Summer Pockets
2025Summer Pocketsas (voice)TV
Catch Me at the Ballpark!
2025Catch Me at the Ballpark!as Kaiser (voice)TV
Puniru Is a Kawaii Slime
2024Puniru Is a Kawaii Slimeas Academic Researchers (voice)TV
Orb: On the Movements of the Earth
2024Orb: On the Movements of the Earthas Knight (voice)TV
Dan Da Dan
2024Dan Da Danas TV Station Producer (voice)TV
Let This Grieving Soul Retire
2024Let This Grieving Soul Retireas Greg Zangief (voice)TV
DAN DA DAN: First Encounter
2024DAN DA DAN: First Encounteras TV Station Producer (voice)Movie
Umamusume: Pretty Derby - Beginning of a New Era
2024Umamusume: Pretty Derby - Beginning of a New Eraas (voice)Movie
Mission: Yozakura Family
2024Mission: Yozakura Familyas Detective (voice)TV
HAIKYU!! The Dumpster Battle
2024HAIKYU!! The Dumpster Battleas Patient (voice)Movie
Tearmoon Empire
2023Tearmoon Empireas Priest (voice)TV
Frieren: Beyond Journey's End
2023Frieren: Beyond Journey's Endas Villager (voice)TV
I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too
2023I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Tooas (voice)TV
The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far
2023The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Faras Sebas (voice)TV
NieR:Automata Ver1.1a
2023NieR:Automata Ver1.1aas Kingdom Citizen (voice)TV
Sword Art Online the Movie – Progressive – Scherzo of Deep Night
2022Sword Art Online the Movie – Progressive – Scherzo of Deep Nightas Naijan (voice)Movie
BLUE LOCK
2022BLUE LOCKas Reporter B (voice)TV
SPY x FAMILY
2022SPY x FAMILYas Rahden (voice)TV
Star Wars: Visions
2021Star Wars: Visionsas Eno's Father / Resistance Member (voice)TV
Remake Our Life!
2021Remake Our Life!as (voice)TV
I've Been Killing Slimes for 300 Years and Maxed Out My Level
2021I've Been Killing Slimes for 300 Years and Maxed Out My Levelas Store Customer E (voice)TV
Super Cub
2021Super Cubas Clerk (voice)TV
Yashahime: Princess Half-Demon
2020Yashahime: Princess Half-Demonas Thug (voice)TV
JUJUTSU KAISEN
2020JUJUTSU KAISENas Fumi's Father (voice)TV
Tower of God
2020Tower of Godas (voice)TV
ID: INVADED
2020ID: INVADEDas Staff (voice)TV
The Quintessential Quintuplets
2019The Quintessential Quintupletsas Teacher (voice)TV
March Comes In Like a Lion
2016March Comes In Like a Lionas Authorized Person 3 (voice)TV
Haikyu!!
2014Haikyu!!as Kai Akakura (voice)TV
Sword Art Online
2012Sword Art Onlineas Technical Staff (voice)TV
Daily Lives of High School Boys
2012Daily Lives of High School Boysas Basketball Guy (voice)TV