 Arifureta: From Commonplace to World's Strongest (2025) (TV Series)-Yue's Father (1 episode, 2025) Yue's Father (1 episode, 2025) See fewer The Overpowered Vampire Princess and the Godlike Rabbit's Grand Battle (Feb 3, 2025) Season 3, Episode 14-Yue's Father (voice) Yue's Father (voice) See fewer |
1 |
 Dandadan (2024) (TV Series)-Homeroom Teacher / Male Customer / TV Station Producer (3 episodes, 2024) Homeroom Teacher / Male Customer / TV Station Producer (3 episodes, 2024) See fewerHatsukoi no hito (Dec 12, 2024) Season 1, Episode 11-Homeroom Teacher (voice) Homeroom Teacher (voice) See fewer |
3 |
 Puniru is a Kawaii Slime (2024) (TV Series)-Academic Researchers (2 episodes, 2024) Academic Researchers (2 episodes, 2024) See fewerMerry Punirumas! (Dec 8, 2024) Season 1, Episode 10-Academic Researchers (voice) Academic Researchers (voice) See fewer Neither Friend nor Slime (Oct 13, 2024) Season 1, Episode 2-Academic Researchers (voice) Academic Researchers (voice) See fewer |
2 |
 Let This Grieving Soul Retire! (2024) (TV Series)-Greg Zangief / Greg Zangif (4 episodes, 2024) Greg Zangief / Greg Zangif (4 episodes, 2024) See fewer The Mysterious Mask Wants to Fight (Oct 20, 2024) Season 1, Episode 4-Greg Zangief (voice) Greg Zangief (voice) See fewer |
4 |
 My Deer Friend Nokotan (2024) (TV Series)-Police Officer (1 episode, 2024) Police Officer (1 episode, 2024) See fewer The Pursuer and the Pursued. (Sep 10, 2024) Season 1, Episode 11-Police Officer (voice) Police Officer (voice) See fewer |
1 |
 NieR:Automata Ver1.1a (2023–2024) (TV Series)-Resistance / Machine Lifeform / Priest / Citizen of the Kingdom (6 episodes, 2023) Resistance / Machine Lifeform / Priest / Citizen of the Kingdom (6 episodes, 2023) See fewer (N)o man's village (Sep 6, 2024) Season 2, Episode 9-Resistance (voice) Resistance (voice) See fewer |
6 |
 The Elusive Samurai (2024) (TV Series)-Settsu no Chikaaki (1 episode, 2024) Settsu no Chikaaki (1 episode, 2024) See fewer5-gatsu 22-nichi (Jul 6, 2024) Season 1, Episode 1-Settsu no Chikaaki (voice) (as Koji Seki) Settsu no Chikaaki (voice) (as Koji Seki) See fewer |
1 |
 Jellyfish Can't Swim in the Night (2024) (TV Mini-series)-Staff (1 episode, 2024) Staff (1 episode, 2024) See fewerJELEE (Jun 23, 2024) Season 1, Episode 12-Staff (voice) (as Koji Seki) Staff (voice) (as Koji Seki) See fewer |
1 |
 Re: Monster (2024) (TV Mini-series)-Fomorian / Goblin (2 episodes, 2024) Fomorian / Goblin (2 episodes, 2024) See fewerRe:Fulgent (Jun 3, 2024) Season 1, Episode 10-Fomorian (voice) Fomorian (voice) See fewerRe:Medy (May 6, 2024) Season 1, Episode 6-Goblin (voice) (as Koji Seki) Goblin (voice) (as Koji Seki) See fewer |
2 |
 The Many Sides of Voice Actor Radio (2024) (TV Series)-Male Fan (1 episode, 2024) Male Fan (1 episode, 2024) See fewer Yuhi and Yasumi Just Can't Give Up (May 22, 2024) Season 1, Episode 7-Male Fan (voice) (as Koji Seki) Male Fan (voice) (as Koji Seki) See fewer |
1 |
 Touken Ranbu Kai: Kyoden Moyuru Honnouji (2024) (TV Mini-series)-Military Commander (1 episode, 2024) Military Commander (1 episode, 2024) See fewerThe Honnoji Incident (May 7, 2024) Season 1, Episode 6-Military Commander (voice) (as Koji Seki) Military Commander (voice) (as Koji Seki) See fewer |
1 |
 YATAGARASU: The Raven Does Not Choose Its Master (2024) (TV Series)-Door Guard (1 episode, 2024) Door Guard (1 episode, 2024) See fewerAn Imperial Council (Apr 27, 2024) Season 1, Episode 4-Door Guard (voice) (as Koji Seki) Door Guard (voice) (as Koji Seki) See fewer |
1 |
 Pon no Michi (2024) (TV Series)-Furuta (1 episode, 2024) Furuta (1 episode, 2024) See fewer The Daughters of the Mahjong Table (Mar 23, 2024) Season 1, Episode 12-Furuta (voice) (as Koji Seki) Furuta (voice) (as Koji Seki) See fewer |
1 |
 BUCCHIGIRI?! (2024) (TV Mini-series)-Dr. Matsunaka / Tailor Fukuzo (2 episodes, 2024) Dr. Matsunaka / Tailor Fukuzo (2 episodes, 2024) See fewer Group Date?! The Sea, Maji Croquette, and I! (Feb 24, 2024) Season 1, Episode 7-Dr. Matsunaka (voice) (as Koji Seki) Dr. Matsunaka (voice) (as Koji Seki) See fewer Love at Fist Fight! The One and Only Quail in the World (Jan 27, 2024) Season 1, Episode 3-Tailor Fukuzo (voice) (as Koji Seki) Tailor Fukuzo (voice) (as Koji Seki) See fewer |
2 |
 Sasaki and Peeps (2024) (TV Series)-Knight / Bureau Staff (3 episodes, 2024) Knight / Bureau Staff (3 episodes, 2024) See fewer Martial and Political Force (Feb 16, 2024) Season 1, Episode 7-Knight (voice) (as Koji Seki) Knight (voice) (as Koji Seki) See fewer |
3 |
 Fluffy Paradise (2024) (TV Series)-Senior Vassal (1 episode, 2024) Senior Vassal (1 episode, 2024) See fewerI've Been Summoned (Jan 8, 2024) Season 1, Episode 2-Senior Vassal (voice) (as Koji Seki) Senior Vassal (voice) (as Koji Seki) See fewer |
1 |
 Migi & Dali (2023) (TV Series)-Science Teacher / Doctor (2 episodes, 2023) Science Teacher / Doctor (2 episodes, 2023) See fewerMigi and Dali (Dec 25, 2023) Season 1, Episode 13-Science Teacher (voice) (as Koji Seki) Science Teacher (voice) (as Koji Seki) See fewerUpside-Down Woman (Dec 11, 2023) Season 1, Episode 11-Doctor (voice) (as Koji Seki) Doctor (voice) (as Koji Seki) See fewer |
2 |
 Tearmoon Empire (2023) (TV Series)-Merchant / Man / Priest / Soldier (5 episodes, 2023) Merchant / Man / Priest / Soldier (5 episodes, 2023) See fewer Princess Mia is Kidnapped (Dec 9, 2023) Season 1, Episode 10-Merchant (voice) (as Koji Seki) Merchant (voice) (as Koji Seki) See fewer |
5 |
 Under Ninja (2023) (TV Series)-Male Student 3 (1 episode, 2023) Male Student 3 (1 episode, 2023) See fewer A Maiden's Chest is a Precious Thing (Dec 8, 2023) Season 1, Episode 10-Male Student 3 (voice) (as Koji Seki) Male Student 3 (voice) (as Koji Seki) See fewer |
1 |
 Jujutsu Kaisen (2023) (TV Series)-Fumi's Father (1 episode, 2023) Fumi's Father (1 episode, 2023) See fewerRight and Wrong - Part 2 (Nov 30, 2023) Season 2, Episode 19-Fumi's Father (voice) (as Koji Seki) Fumi's Father (voice) (as Koji Seki) See fewer |
1 |
 Saint Cecilia and Pastor Lawrence (2023) (TV Series)-Townspeople (1 episode, 2023) Townspeople (1 episode, 2023) See fewerThe Way They Met (Sep 21, 2023) Season 1, Episode 11-Townspeople (voice) (as Koji Seki) Townspeople (voice) (as Koji Seki) See fewer |
1 |
 I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too (2023) (TV Series)- Actor (7 episodes, 2023) Actor (7 episodes, 2023) See fewerYuuya and Kaori (Jun 30, 2023) Season 1, Episode 13- Actor (voice) (as Koji Seki) Actor (voice) (as Koji Seki) See fewer |
7 |
 The Aristocrat's Otherworldly Adventure: Serving Gods Who Go Too Far (2023) (TV Mini-series)-Bandit C / Knight C / Noble / Royal Knight B / Sebas (5 episodes, 2023) Bandit C / Knight C / Noble / Royal Knight B / Sebas (5 episodes, 2023) See fewer The Trials of an A-Rank Adventurer (Jun 4, 2023) Season 1, Episode 10-Bandit C (voice) (as Koji Seki) Bandit C (voice) (as Koji Seki) See fewer |
5 |
 Trigun Stampede (2023) (TV Series)- Actor (1 episode, 2023) Actor (1 episode, 2023) See fewer Once Upon a Time in Hopeland (Feb 11, 2023) Season 1, Episode 6- Actor (voice) (as Koji Seki) Actor (voice) (as Koji Seki) See fewer |
1 |
 Ippon Again! (2023) (TV Mini-series)-Additional Voice (1 episode, 2023) Additional Voice (1 episode, 2023) See fewerFormed! Revived! Restarted! (Jan 16, 2023) Season 1, Episode 2-Additional Voice (voice) (as Koji Seki) Additional Voice (voice) (as Koji Seki) See fewer |
1 |
 Blue Lock (2022) (TV Series)-Reporter B (1 episode, 2022) Reporter B (1 episode, 2022) See fewerMonster (Oct 15, 2022) Season 1, Episode 2-Reporter B (voice) Reporter B (voice) See fewer |
1 |
 Phantom of the Idol (2022) (TV Series)-Cameraman (1 episode, 2022) Cameraman (1 episode, 2022) See fewerStage 8 (Aug 20, 2022) Season 1, Episode 8-Cameraman (voice) (as Koji Seki) Cameraman (voice) (as Koji Seki) See fewer |
1 |
 The Rising of the Shield Hero (2022) (TV Series)-Official A (1 episode, 2022) Official A (1 episode, 2022) See fewerHumming Fairy (Jun 1, 2022) Season 2, Episode 9-Official A (voice) (as Koji Seki) Official A (voice) (as Koji Seki) See fewer |
1 |
 Yashahime: Princess Half-Demon (2020–2022) (TV Series)-Yôkai / Staff / Midori oni / Murabito / Kashin / … (26 episodes, 2020) See more Yôkai / Staff / Midori oni / Murabito / Kashin / Ganseki majin / Kagomochi / Oni / Ryôshi / Chimimôryô / Chônin / Buka / Hyakushô / Gokurakuchô / Mura no otoko / Rôtô / Daikan / Tabiakindo / Rôjin / Furyô (26 episodes, 2020) See fewerTowa ni tsuzuku mirai (Mar 26, 2022) Season 2, Episode 24- Actor (voice) (as Koji Seki) Actor (voice) (as Koji Seki) See fewer |
26 |
 Urawa no Usagi-chan (2015–2022) (TV Mini-series)-Father Takasago Father Takasago See fewer |
|
 Fena: Pirate Princess (2021) (TV Series)-Villager (1 episode, 2021) Villager (1 episode, 2021) See fewerA Knight's Vow (Sep 26, 2021) Season 1, Episode 8-Villager (voice) (as Koji Seki) Villager (voice) (as Koji Seki) See fewer |
1 |
 Remake Our Life! (2021) (TV Series)-Additional Voices (1 episode, 2021) Additional Voices (1 episode, 2021) See fewerBe Prepared (Sep 18, 2021) Season 1, Episode 11-Additional Voices (as Koji Seki) Additional Voices (as Koji Seki) See fewer |
1 |
 Boruto: Naruto Next Generations (2021) (TV Series)-Tsuzumi (1 episode, 2021) Tsuzumi (1 episode, 2021) See fewerKara no tegakari (Aug 8, 2021) Season 1, Episode 210-Tsuzumi (voice) (as Koji Seki) Tsuzumi (voice) (as Koji Seki) See fewer |
1 |
 Dragon Goes House Hunting (2021) (TV Series)-Castle Servant A / Monster B / Mob B / Mob Hero C / Ten / … (11 episodes, 2021) See more Castle Servant A / Monster B / Mob B / Mob Hero C / Ten / Skeleton B / Shopkeeper / Chimera / Onibi / Dwarf A / Goblin B (11 episodes, 2021) See fewerA Well-Defended Home (Jun 20, 2021) Season 1, Episode 12-Castle Servant A (voice) Castle Servant A (voice) See fewer |
11 |
 Super Cub (2021) (TV Series)-Salesperson (2 episodes, 2021) Salesperson (2 episodes, 2021) See fewerIn Ice (Jun 2, 2021) Season 1, Episode 9-Salesperson (voice) (as Koji Seki) Salesperson (voice) (as Koji Seki) See fewerReiko's Summer (May 5, 2021) Season 1, Episode 5-Salesperson (voice) (as Koji Seki) Salesperson (voice) (as Koji Seki) See fewer |
2 |
 I've Been Killing Slimes for 300 Years and Maxed Out My Level (2021) (TV Series)-Customer (1 episode, 2021) Customer (1 episode, 2021) See fewer A Fake Witch of the Highlands Appeared (May 29, 2021) Season 1, Episode 8-Customer (as Koji Seki) Customer (as Koji Seki) See fewer |
1 |
 Warlords of Sigrdrifa (2020) (TV Series)-Maintenance Team Member / Makoto Oyama / Crepe Shop Owner / Soichiro Takada / Pilot (7 episodes, 2020) Maintenance Team Member / Makoto Oyama / Crepe Shop Owner / Soichiro Takada / Pilot (7 episodes, 2020) See fewerWelcome to Tateyama Base!! (Dec 26, 2020) Season 1, Episode 12-Maintenance Team Member (voice) (as Koji Seki) Maintenance Team Member (voice) (as Koji Seki) See fewer |
7 |
 ID:Invaded (2020) (TV Mini-series)-Employee (1 episode, 2020) Employee (1 episode, 2020) See fewerCHANNELED (Mar 15, 2020) Season 1, Episode 12-Employee (voice) (as Koji Seki) Employee (voice) (as Koji Seki) See fewer |
1 |
 Haikyu!! (2020) (TV Series)-Kai Akakura (4 episodes, 2020) Kai Akakura (4 episodes, 2020) See fewerHunger (Feb 7, 2020) Season 4, Episode 5-Kai Akakura (voice) (as Koji Seki) Kai Akakura (voice) (as Koji Seki) See fewer |
4 |
 Outburst Dreamer Boys (2019) (TV Series)-Homeroom Teacher (2 episodes, 2019) Homeroom Teacher (2 episodes, 2019) See fewer I've Got a Complication, There's a Fanfare in My Head (Oct 25, 2019) Season 1, Episode 4-Homeroom Teacher (voice) (as Koji Seki) Homeroom Teacher (voice) (as Koji Seki) See fewerThat's Right, I Have Awakened (Oct 4, 2019) Season 1, Episode 1-Homeroom Teacher (voice) (as Koji Seki) Homeroom Teacher (voice) (as Koji Seki) See fewer |
2 |
 Try Knights (2019) (TV Series)-Rugby Team Member (1 episode, 2019) Rugby Team Member (1 episode, 2019) See fewerThe Moon and the Sun (Jul 31, 2019) Season 1, Episode 1-Rugby Team Member (voice) Rugby Team Member (voice) See fewer |
1 |
 Ulysses: Jeanne d'Arc and the Alchemist Knight (2018) (TV Series)-Yoshunaga Otome / Messenger / Citizen A / Masked Man / Mercenary A / … (8 episodes, 2018) See more Yoshunaga Otome / Messenger / Citizen A / Masked Man / Mercenary A / Noble A / Domremy Inhabitant / Captain (8 episodes, 2018) See fewer Dance Music of White and Black (Dec 9, 2018) Season 1, Episode 9-Yoshunaga Otome (voice) Yoshunaga Otome (voice) See fewer |
8 |
 As Miss Beelzebub Likes It (2018) (TV Series)-Waiter / Laborer / Lover Boy (3 episodes, 2018) Waiter / Laborer / Lover Boy (3 episodes, 2018) See fewer A Bit Bitter, Bibliomania/Go Forth, with Brownies (Nov 8, 2018) Season 1, Episode 5-Waiter (voice) (as Koji Seki) Waiter (voice) (as Koji Seki) See fewer |
3 |
 Overlord (2018) (TV Series)-Arche's Father (1 episode, 2018) Arche's Father (1 episode, 2018) See fewerInvitation to Death (Aug 14, 2018) Season 3, Episode 6-Arche's Father (voice) (as Koji Seki) Arche's Father (voice) (as Koji Seki) See fewer |
1 |
 Magical Girl Site (2018) (TV Series)-Funeral Company Staff / Rainbow Sea Father / Forensics Man / Rescuer B / PE Teacher / Lead Doctor (6 episodes, 2018) Funeral Company Staff / Rainbow Sea Father / Forensics Man / Rescuer B / PE Teacher / Lead Doctor (6 episodes, 2018) See fewerBreaking (Jun 9, 2018) Season 1, Episode 10-Funeral Company Staff (voice) (as Koji Seki) Funeral Company Staff (voice) (as Koji Seki) See fewer |
6 |
 B: The Beginning (2018) (TV Series)-Others (1 episode, 2018) Others (1 episode, 2018) See fewerEpisode #1.8 (Mar 2, 2018) Season 1, Episode 8-Others (voice) (as Koji Seki) Others (voice) (as Koji Seki) See fewer |
1 |
 Death March to the Parallel World Rhapsody (2018) (TV Mini-series)-Boido (1 episode, 2018) Boido (1 episode, 2018) See fewer Love That Started with a Death March (Jan 25, 2018) Season 1, Episode 3-Boido (voice) (as Koji Seki) Boido (voice) (as Koji Seki) See fewer |
1 |
 18If (2017) (TV Series)-Producer (1 episode, 2017) Producer (1 episode, 2017) See fewer Idols Don't Go to the Bathroom! (Sep 1, 2017) Season 1, Episode 9-Producer (voice) (as Koji Seki) Producer (voice) (as Koji Seki) See fewer |
1 |
 Akiba's Trip the Animation (2017) (TV Series)-Conglomerate Company Employee (1 episode, 2017) Conglomerate Company Employee (1 episode, 2017) See fewer Electric Mayo's Falling Apart! (Mar 22, 2017) Season 1, Episode 12-Conglomerate Company Employee (voice) Conglomerate Company Employee (voice) See fewer |
1 |
 Tales of Zestiria the X (2017) (TV Series)-Soldiers / Soldier (2 episodes, 2017) Soldiers / Soldier (2 episodes, 2017) See fewer Justice at Hand Rather Than Ideal Beyond One's Reach (Feb 5, 2017) Season 2, Episode 5-Soldiers (voice) (as Koji Seki) Soldiers (voice) (as Koji Seki) See fewerWind Seraph, Dezel (Jan 15, 2017) Season 2, Episode 2-Soldier (voice) (as Koji Seki) Soldier (voice) (as Koji Seki) See fewer |
2 |
 Shomin Sample (2015) (TV Mini-series)-Muscle Corps (2 episodes, 2015) Muscle Corps (2 episodes, 2015) See fewer Inexperienced Though I Am, Please Accept Me Forever (Dec 23, 2015) Season 1, Episode 12-Muscle Corps (as Koji Seki) Muscle Corps (as Koji Seki) See fewerWelcome, Commoner (Oct 7, 2015) Season 1, Episode 1-Muscle Corps (as Koji Seki) Muscle Corps (as Koji Seki) See fewer |
2 |
 Chaos Dragon: Sekiryuu Sen'eki (2015) (TV Series)-Man B (1 episode, 2015) Man B (1 episode, 2015) See fewerKill One to Save Many (Jul 2, 2015) Season 1, Episode 1-Man B (voice) (as Kouji Seki) Man B (voice) (as Kouji Seki) See fewer |
1 |
 World Break: Aria of Curse for a Holy Swordsman (2015) (TV Series)-Bodyguard (1 episode, 2015) Bodyguard (1 episode, 2015) See fewerBattle at Yekaterinburg (Mar 15, 2015) Season 1, Episode 10-Bodyguard (voice) (as Koji Seki) Bodyguard (voice) (as Koji Seki) See fewer |
1 |
 Sengoku Collection (2012) (TV Series)-Yamanaka (1 episode, 2012) Yamanaka (1 episode, 2012) See fewerBrutal Maiden (Jun 14, 2012) Season 1, Episode 11-Yamanaka (voice) Yamanaka (voice) See fewer |
1 |
 Daily Lives of High School Boys (2012) (TV Series)-Boy / Basketball Guy (2 episodes, 2012) Boy / Basketball Guy (2 episodes, 2012) See fewer High School Boys and Fathers (Mar 19, 2012) Season 1, Episode 11-Boy (voice) (as Kouji Seki) Boy (voice) (as Kouji Seki) See fewer High School Boys and Summer Plans (Jan 23, 2012) Season 1, Episode 3-Basketball Guy (voice) (as Kouji Seki) Basketball Guy (voice) (as Kouji Seki) See fewer |
2 |
 Senki Zesshô Shinfogia (2012) (TV Series)-Researcher A (1 episode, 2012) Researcher A (1 episode, 2012) See fewer Awakening Heartbeat (Jan 6, 2012) Season 1, Episode 1-Researcher A (voice) Researcher A (voice) See fewer |
1 |
 Gintama (2011) (TV Series)-Shinsengumi Member / Renho A (2 episodes, 2011) Shinsengumi Member / Renho A (2 episodes, 2011) See fewerA Vacation in Disorientation (Dec 12, 2011) Season 2, Episode 37-Shinsengumi Member (voice) (as Kouji Seki) Shinsengumi Member (voice) (as Kouji Seki) See fewerEmpty Planet (Nov 21, 2011) Season 2, Episode 34-Renho A (voice) (as Kouji Seki) Renho A (voice) (as Kouji Seki) See fewer |
2 |
 White Album (2009) (TV Series)-People (1 episode, 2009) People (1 episode, 2009) See fewer Shibaru koto. Azamuku koto. Ubau koto. Ataeru koto. Doreyori tsurai no ga, matsu koto. (Mar 21, 2009) Season 1, Episode 12-People (voice) People (voice) See fewer |
1 |