Acting credits
34
Established
Large and steady acting portfolio.
Actor
Koji Seki
Acting
Career Snapshot
ExplainedThese indicators come from TMDB. They are relative signals, not review ratings.
TMDB popularity
0.9
Low visibility
TMDB internal trend index. Higher usually means more searches and page activity now.
Movies: 4Series: 30
TMDB ID: 2261331
IMDb ID: nm9671888
Known for: Acting
Born: November 25, 1982
Age: 43
Place of birth: Saitama, Japan
Gender: Male
Adult content flag: No
Career span: 2012 - 2025
Years active: 14
Average TMDB rating: 7.83
Wikidata: Q11655780
Also known as
Kouji Seki • 関 幸司 • Kōji Seki
Biography
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.
Photos
Movies
Movies
Movie credits linked with Koji Seki.
7.6
DAN DA DAN: First Encounter
as TV Station Producer (voice)
2024 Movie
7.7
Umamusume: Pretty Derby - Beginning of a New Era
as (voice)
2024 Movie
7.7
HAIKYU!! The Dumpster Battle
as Patient (voice)
2024 Movie
7.7
Sword Art Online the Movie – Progressive – Scherzo of Deep Night
as Naijan (voice)
2022 Movie
Series
Series
Series credits linked with Koji Seki.
8.0
Inexpressive Kashiwada and Expressive Oota
as Mathematics Teacher (voice) • 1 eps
2025 Series
7.7
Solo Camping for Two
as Izakaya Manager (voice) • 1 eps
2025 Series
7.0
Turkey! Time to Strike
as Samurai (voice) • 1 eps
2025 Series
7.5
Welcome to the Outcast's Restaurant!
as Merchant (voice) • 1 eps
2025 Series
7.1
Summer Pockets
as (voice) • 3 eps
2025 Series
7.9
Catch Me at the Ballpark!
as Kaiser (voice) • 1 eps
2025 Series
7.9
Puniru Is a Kawaii Slime
as Academic Researchers (voice) • 2 eps
2024 Series
7.9
Orb: On the Movements of the Earth
as Knight (voice) • 1 eps
2024 Series
8.6
Dan Da Dan
as TV Station Producer (voice) • 1 eps
2024 Series
6.7
Let This Grieving Soul Retire
as Greg Zangief (voice) • 24 eps
2024 Series
7.4
Mission: Yozakura Family
as Detective (voice) • 1 eps
2024 Series
7.1
Tearmoon Empire
as Priest (voice) • 2 eps
2023 Series
8.2
I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too
as (voice) • 7 eps
2023 Series
7.1
The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far
as Sebas (voice) • 1 eps
2023 Series
8.1
NieR:Automata Ver1.1a
as Kingdom Citizen (voice) • 1 eps
2023 Series
8.2
BLUE LOCK
as Reporter B (voice) • 1 eps
2022 Series
8.5
SPY x FAMILY
as Rahden (voice) • 1 eps
2022 Series
7.1
Star Wars: Visions
as Eno's Father / Resistance Member (voice) • 1 eps
2021 Series
7.2
Remake Our Life!
as (voice) • 1 eps
2021 Series
7.9
I've Been Killing Slimes for 300 Years and Maxed Out My Level
as Store Customer E (voice) • 1 eps
2021 Series
7.2
Super Cub
as Clerk (voice) • 2 eps
2021 Series
8.6
JUJUTSU KAISEN
as Fumi's Father (voice) • 1 eps
2020 Series
8.3
Yashahime: Princess Half-Demon
as Thug (voice) • 1 eps
2020 Series
8.2
Tower of God
as (voice) • 1 eps
2020 Series