Koji Seki
Known for: Acting
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.
Filmography
Series
March Comes In Like a Lion
Authorized Person 3 (voice)
2016
Series
JUJUTSU KAISEN
Fumi's Father (voice)
2020
Series
Frieren: Beyond Journey's End
Villager (voice)
2023
Series
Solo Camping for Two
Izakaya Manager (voice)
2025
Series
SPY x FAMILY
Rahden (voice)
2022
Series
Star Wars: Visions Presents - The Ninth Jedi
Satellite Digger (voice)
2026
Series
Star Wars: Visions Presents - The Ninth Jedi
Eesha's Father (voice)
2026
Series
Star Wars: Visions Presents - The Ninth Jedi
Villager on Samaz (voice)
2026
Series
You and I Are Polar Opposites
Convenience Store Manager (voice)
2026
Series
Dan Da Dan
TV Station Producer (voice)
2024
Series
Dan Da Dan
Male Client (voice)
2024
Series
Dan Da Dan
Male Teacher (voice)
2024
Series
Sword Art Online
Technical Staff (voice)
2012
Series
Sword Art Online
Goblin (voice)
2012
Series
Haikyu!!
Kai Akakura (voice)
2014
Series
BLUE LOCK
Reporter B (voice)
2022
Series
Tower of God
(voice)
2020
Series
Mission: Yozakura Family
Detective (voice)
2024
Series
Mission: Yozakura Family
(voice)
2024
Series
Mission: Yozakura Family
Battalion member (voice)
2024
Series
Turkey! Time to Strike
Samurai (voice)
2025
Series
Star Wars: Visions
Eno's Father / Resistance Member (voice)
2021
Series
Akane-banashi
Chusuke Chuotei (voice)
2026
Series
Orb: On the Movements of the Earth
Knight (voice)
2024
Series
Yashahime: Princess Half-Demon
Thug (voice)
2020
Series
Yashahime: Princess Half-Demon
Old man (voice)
2020
Series
Yashahime: Princess Half-Demon
Peddler (voice)
2020
Series
Yashahime: Princess Half-Demon
Official (voice)
2020
Series
Yashahime: Princess Half-Demon
Guard (voice)
2020
Series
Yashahime: Princess Half-Demon
Villager (voice)
2020
Series
Yashahime: Princess Half-Demon
Chimimoryo (voice)
2020
Series
Yashahime: Princess Half-Demon
Bird of Paradise (voice)
2020
Series
Yashahime: Princess Half-Demon
Peasant (voice)
2020
Series
Yashahime: Princess Half-Demon
Townsfolk (voice)
2020
Series
Yashahime: Princess Half-Demon
Subordinate (voice)
2020
Series
Yashahime: Princess Half-Demon
Vassal (voice)
2020
Series
Yashahime: Princess Half-Demon
Demon (voice)
2020
Series
Yashahime: Princess Half-Demon
Fisherman (voice)
2020
Series
Yashahime: Princess Half-Demon
Rock Demon (voice)
2020
Series
Yashahime: Princess Half-Demon
Palanquin Carrier (voice)
2020
Series
Yashahime: Princess Half-Demon
Green ogre (voice)
2020
Series
Yashahime: Princess Half-Demon
Staff member (voice)
2020
Series
Yashahime: Princess Half-Demon
Yokai (voice)
2020
Series
Yashahime: Princess Half-Demon
Raccoon dog in Mamiana Island (voice)
2020
Series
Puniru Is a Kawaii Slime
Academic Researchers (voice)
2024
Series
Puniru Is a Kawaii Slime
Academic Researcher (voice)
2024
Series
Daily Lives of High School Boys
Basketball Guy (voice)
2012
Series
Daily Lives of High School Boys
Boy B (voice)
2012
Series
The Quintessential Quintuplets
Teacher (voice)
2019
Series
The Quintessential Quintuplets
Homeroom Teacher (voice)
2019
Series
Tearmoon Empire
Priest (voice)
2023
Series
Tearmoon Empire
Man (voice)
2023
Series
Tearmoon Empire
Soldier (voice)
2023
Series
Tearmoon Empire
Merchant (voice)
2023
Series
Summer Pockets
(voice)
2025
Series
I've Been Killing Slimes for 300 Years and Maxed Out My Level
Store Customer E (voice)
2021
Series
Let This Grieving Soul Retire
Greg Zangief (voice)
2024
Series
NieR:Automata Ver1.1a
Kingdom Citizen (voice)
2023
Series
NieR:Automata Ver1.1a
Machine Creature (voice)
2023
Series
Catch Me at the Ballpark!
Kaiser (voice)
2025
Series
ID: INVADED
Staff (voice)
2020
Series
I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too
(voice)
2023
Series
Inexpressive Kashiwada and Expressive Oota
Mathematics Teacher (voice)
2025
Series
The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far
Sebas (voice)
2023
Film
HAIKYU!! The Dumpster Battle
Patient (voice)
2024
Series
Welcome to the Outcast's Restaurant!
Merchant (voice)
2025
Series
Remake Our Life!
(voice)
2021
Series
Super Cub
Clerk (voice)
2021
Film
Umamusume: Pretty Derby - Beginning of a New Era
(voice)
2024
Film
Sword Art Online the Movie – Progressive – Scherzo of Deep Night
Naijan (voice)
2022
Film
DAN DA DAN: First Encounter
TV Station Producer (voice)
2024