Acting
Koji Seki
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.
Acting
- 2026Star Wars: Visions Presents - The Ninth JediSatellite Digger (voice)4 ep.
- 2026Akane-banashiChusuke Chuotei (voice)1 ep.
- 2026You and I Are Polar OppositesConvenience Store Manager (voice)2 ep.
- 2025Inexpressive Kashiwada and Expressive OotaMathematics Teacher (voice)1 ep.
- 2025Solo Camping for TwoIzakaya Manager (voice)1 ep.
- 2025Turkey! Time to StrikeSamurai (voice)1 ep.
- 2025Welcome to the Outcast's Restaurant!Merchant (voice)1 ep.
- 2025Summer Pockets(voice)3 ep.
- 2025Catch Me at the Ballpark!Kaiser (voice)1 ep.
- 2024Puniru Is a Kawaii SlimeAcademic Researchers (voice)3 ep.
- 2024Orb: On the Movements of the EarthKnight (voice)1 ep.
- 2024Dan Da DanMale Client (voice)3 ep.
- 2024Let This Grieving Soul RetireGreg Zangief (voice)24 ep.
- 2024Mission: Yozakura FamilyDetective (voice)3 ep.
- 2023Tearmoon EmpirePriest (voice)5 ep.
- 2023Frieren: Beyond Journey's EndVillager (voice)1 ep.
- 2023I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too(voice)7 ep.
- 2023The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too FarSebas (voice)1 ep.
- 2023NieR:Automata Ver1.1aKingdom Citizen (voice)2 ep.
- 2022BLUE LOCKReporter B (voice)1 ep.
- 2022SPY x FAMILYRahden (voice)1 ep.
- 2021Star Wars: VisionsEno's Father / Resistance Member (voice)1 ep.
- 2021Remake Our Life!(voice)1 ep.
- 2021I've Been Killing Slimes for 300 Years and Maxed Out My LevelStore Customer E (voice)1 ep.
- 2021Super CubClerk (voice)2 ep.
- 2020Yashahime: Princess Half-DemonVillager (voice)27 ep.
- 2020JUJUTSU KAISENFumi's Father (voice)1 ep.
- 2020Tower of God(voice)1 ep.
- 2020ID: INVADEDStaff (voice)1 ep.
- 2019The Quintessential QuintupletsHomeroom Teacher (voice)3 ep.
- 2016March Comes In Like a LionAuthorized Person 3 (voice)1 ep.
- 2014Haikyu!!Kai Akakura (voice)4 ep.
- 2012Sword Art OnlineTechnical Staff (voice)2 ep.
- 2012Daily Lives of High School BoysBoy B (voice)2 ep.
Guest appearances
- 2026Star Wars: Visions Presents - The Ninth JediEesha's Father (voice), Satellite Digger (voice), Villager on Samaz (voice)4 ep.
- 2026You and I Are Polar OppositesConvenience Store Manager (voice)2 ep.
- 2026Akane-banashiChusuke Chuotei (voice)1 ep.
- 2026Frieren: Beyond Journey's EndVillager (voice)1 ep.
- 2025Star Wars: VisionsEno's Father / Resistance Member (voice)1 ep.
- 2025SPY x FAMILYRahden (voice)1 ep.
- 2025Inexpressive Kashiwada and Expressive OotaMathematics Teacher (voice)1 ep.
- 2025Solo Camping for TwoIzakaya Manager (voice)1 ep.
- 2025Turkey! Time to StrikeSamurai (voice)1 ep.
- 2025Summer Pockets(voice)3 ep.
- 2024Puniru Is a Kawaii SlimeAcademic Researcher (voice), Academic Researchers (voice)3 ep.
- 2025Welcome to the Outcast's Restaurant!Merchant (voice)1 ep.
- 2025Catch Me at the Ballpark!Kaiser (voice)1 ep.
- 2025Orb: On the Movements of the EarthKnight (voice)1 ep.
- 2024Dan Da DanMale Client (voice), Male Teacher (voice), TV Station Producer (voice)3 ep.
- 2024Tower of God(voice)1 ep.
- 2024Mission: Yozakura Family(voice), Battalion member (voice), Detective (voice)3 ep.
- 2023Tearmoon EmpireMan (voice), Merchant (voice), Priest (voice), Soldier (voice)5 ep.
- 2023JUJUTSU KAISENFumi's Father (voice)1 ep.
- 2023I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too(voice)7 ep.
- 2023The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too FarSebas (voice)1 ep.
- 2023NieR:Automata Ver1.1aKingdom Citizen (voice), Machine Creature (voice)2 ep.
- 2022BLUE LOCKReporter B (voice)1 ep.
- 2020Yashahime: Princess Half-DemonBird of Paradise (voice), Chimimoryo (voice), Demon (voice), Fisherman (voice)27 ep.
- 2021Remake Our Life!(voice)1 ep.
- 2021Super CubClerk (voice)2 ep.
- 2021I've Been Killing Slimes for 300 Years and Maxed Out My LevelStore Customer E (voice)1 ep.
- 2019Sword Art OnlineGoblin (voice), Technical Staff (voice)2 ep.
- 2020ID: INVADEDStaff (voice)1 ep.
- 2020Haikyu!!Kai Akakura (voice)4 ep.
- 2019The Quintessential QuintupletsHomeroom Teacher (voice), Teacher (voice)3 ep.
- 2018March Comes In Like a LionAuthorized Person 3 (voice)1 ep.
- 2012Daily Lives of High School BoysBasketball Guy (voice), Boy B (voice)2 ep.
Also known as: Kouji Seki · 関 幸司 · Kōji Seki