Koji Seki

Characters played by Koji Seki

Career Overview

Koji Seki has 33 screen credits in a career dating back to 2012. Their work spans 3 cinematic universes — most prominently Dandadan: Collection with 1 titles. Signature works include Let This Grieving Soul Retire, Sword Art Online the Movie – Progressive – Scherzo of Deep Night, DAN DA DAN: First Encounter. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.

Personal Facts

Known For

Acting

Gender

male

Known Credits

33

Birth Date

1982-11-25

Birth Place

Saitama, Japan

Known For

• 

  Let This Grieving Soul Retire
• 

  Sword Art Online the Movie – Progressive – Scherzo of Deep Night
• 

  DAN DA DAN: First Encounter
• 

  Umamusume: Pretty Derby - Beginning of a New Era
• 

  HAIKYU!! The Dumpster Battle

Associated Universes

Universe traveler — spans 3 universes

• Dandadan: Collection (1 titles)
• HAIKYU!! Final Arc Collection (1 titles)
• Sword Art Online Progressive Collection (1 titles)

Frequent Collaborators

• Ryohei Kimura (2 collaborations)
• Shinya Takahashi (2 collaborations)
• Ryota Osaka (2 collaborations)
• Natsuki Hanae (2 collaborations)
• Miyu Tomita (2 collaborations)
• Mayuko Kazama (2 collaborations)
• Saya Hitomi (2 collaborations)
• Aoi Inase (2 collaborations)
• Kyosuke Mano (2 collaborations)
• Kosuke Kobayashi (2 collaborations)

Credits

• actors (33 credits)

  • You and I Are Polar Opposites

    - Dilemma of a Winter's Night (2026) ... Convenience Store Manager (voice) actor actors

    - Surprise! (2026) ... Convenience Store Manager (voice) actor actors
    2026
  • Summer Pockets

    - Dawn Memories (2025) ... (voice) actor actors

    - A Pair of Butterflies (2025) ... (voice) actor actors

    - Priestess of Sorakado (2025) ... (voice) actor actors
    2025
  • Solo Camping for Two

    - The Origins of Going Solo (2025) ... Izakaya Manager (voice) actor actors
    2025
  • Turkey! Time to Strike

    - Lost, Outside the Spot (2025) ... Samurai (voice) actor actors
    2025
  • Inexpressive Kashiwada and Expressive Oota

    - Those Who Are Completely Inexpressive and Those Who Are Super Expressive (2025) ... Mathematics Teacher (voice) actor actors
    2025
  • Let This Grieving Soul Retire

    Greg Zangief (voice)

    actor

    actors

    - I Want to Have a Big Laugh at the End (2025) ... Greg Zangief (voice) actor actors

    - I'm Grateful for the Assistance of My Friends (2025) ... Greg Zangief (voice) actor actors

    - The Nine-Tailed Fox Wants to Move in the Shadows (2025) ... Greg Zangief (voice) actor actors

    - I'd Rather Skip the Escort Quest (2025) ... Greg Zangief (voice) actor actors

    - I Want to Hand Out Gifts to Everyone (2025) ... Greg Zangief (voice) actor actors
    2024
  • DAN DA DAN: First Encounter

    TV Station Producer (voice)

    actor

    actors
    2024
  • Umamusume: Pretty Derby - Beginning of a New Era

    (voice)

    actor

    actors
    2024
  • HAIKYU!! The Dumpster Battle

    Patient (voice)

    actor

    actors
    2024
  • Orb: On the Movements of the Earth

    - Neither of You Will Be Known to History (2025) ... Knight (voice) actor actors
    2024
  • Mission: Yozakura Family

    - Yozakura Blood (2024) ... Battalion member (voice) actor actors

    - Aim for the Suite Room (2024) ... (voice) actor actors

    - Prison Break Grandpa (2024) ... Detective (voice) actor actors
    2024
  • Puniru Is a Kawaii Slime

    - Puniru Returns (2025) ... Academic Researcher (voice) actor actors

    - Merry Punirumas! (2024) ... Academic Researchers (voice) actor actors

    - Neither Friend nor Slime (2024) ... Academic Researchers (voice) actor actors
    2024
  • Dan Da Dan

    - First Love (2024) ... Male Teacher (voice) actor actors

    - Kicking Turbo Granny's Ass (2024) ... Male Client (voice) actor actors

    - It's a Granny vs. Granny Clash! (2024) ... TV Station Producer (voice) actor actors
    2024
  • The Apothecary Diaries

    - The White-Snake Immortal (2026) ... Audience (voice) actor actors
    2023
  • Frieren: Beyond Journey's End

    - Logistics in the Northern Plateau (2026) ... Villager (voice) actor actors
    2023
  • I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too

    - Yuuya and Kaori (2023) ... (voice) actor actors

    - The Mysterious Assailant (2023) ... (voice) actor actors

    - To the Royal Capital (2023) ... (voice) actor actors

    - Off-Campus Study Trip (2023) ... (voice) actor actors

    - New Family (2023) ... (voice) actor actors
    2023
  • Tearmoon Empire

    - Princess Mia Is Kidnapped! (2023) ... Merchant (voice) actor actors

    - Princess Mia Grins Slyly (2023) ... Man (voice) actor actors

    - Princess Mia Sees Clearly (2023) ... Priest (voice) actor actors

    - Princess Mia Displays Her Smug Face (2023) ... Priest (voice) actor actors

    - The Princess Starting From the Chopping Block (2023) ... Soldier (voice) actor actors
    2023
  • NieR:Automata Ver1.1a

    - [Q]uestionable actions (2023) ... Kingdom Citizen (voice) actor actors

    - a mountain too [H]igh (2023) ... Machine Creature (voice) actor actors
    2023
  • The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far

    - My Tutors Are Adventurers (2023) ... Sebas (voice) actor actors
    2023
  • Sword Art Online the Movie – Progressive – Scherzo of Deep Night

    Naijan (voice)

    actor

    actors
    2022
  • SPY x FAMILY

    - Avoid Getting Tonitrus Bolts | ■■■■'s Memories I (2025) ... Rahden (voice) actor actors
    2022
  • Star Wars: Visions

    - The Bounty Hunters (2025) ... Eno's Father / Resistance Member (voice) actor actors
    2021
  • Super Cub

    - In Ice (2021) ... Clerk (voice) actor actors

    - Reiko's Summer (2021) ... Clerk (voice) actor actors
    2021
  • I've Been Killing Slimes for 300 Years and Maxed Out My Level

    - A Fake Witch of the Highlands Appeared (2021) ... Store Customer E (voice) actor actors
    2021
  • Tower of God

    - Funky! (2024) ... (voice) actor actors
    2020
  • Yashahime: Princess Half-Demon

    - A Never-Ending Future (2022) ... Villager (voice) actor actors

    - The Grim Butterfly of Despair (2022) ... Raccoon dog in Mamiana Island (voice) actor actors

    - Osamu Kirin's Apparition Conquest (2022) ... Yokai (voice) actor actors

    - When the Grim Comet Falls (2022) ... Yokai (voice) actor actors

    - The Blackout (2022) ... Staff member (voice) actor actors
    2020
  • JUJUTSU KAISEN

    - Right and Wrong (2) (2023) ... Fumi's Father (voice) actor actors
    2020
  • ID: INVADED

    - Channeled (2020) ... Staff (voice) actor actors
    2020
  • The Quintessential Quintuplets

    - Legend of Fate Day 1 (2019) ... Homeroom Teacher (voice) actor actors

    - What's Been Built Up (2019) ... Homeroom Teacher (voice) actor actors

    - The Quintessential Quintuplets (2019) ... Teacher (voice) actor actors
    2019
  • March Comes In Like a Lion

    - Burnt Field (3) / Burnt Field (4) (2018) ... Authorized Person 3 (voice) actor actors
    2016
  • Haikyu!!

    - Hunger (2020) ... Kai Akakura (voice) actor actors

    - Take it Easy (2020) ... Kai Akakura (voice) actor actors

    - Perspective (2020) ... Kai Akakura (voice) actor actors

    - Lost (2020) ... Kai Akakura (voice) actor actors
    2014
  • Sword Art Online

    - Beyond Time (2020) ... Technical Staff (voice) actor actors

    - Raids (2019) ... Goblin (voice) actor actors
    2012
  • Daily Lives of High School Boys

    - Fathers / Literary Girl 4 / Conflict / Kick the Can / Chitchat / Love Letters / Distance / Annoyance / Conflict (2012) ... Boy B (voice) actor actors

    - High School Boys and Summer Plans (2012) ... Basketball Guy (voice) actor actors
    2012