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Kousuke Oonishi (大西 弘祐, Ōnishi Kōsuke, born May 7, 1991) is a Japanese voice actor (seiyū) from Saitama prefecture who is associated with Arts Vision. He graduated from the Nihon Narration Engi Kenkyūjo (Japan Narration Acting School). His hobbies and special skills are puns and singing.

Haigakura
as Dragon Warrior (voice)

Terminator Zero
as Paramedic (voice)

Vampire Dormitory
as Guest E (voice)

My Daemon
as Soldier 3 (voice)

Tearmoon Empire
as Man (voice)

My Happy Marriage
as (voice)

The Café Terrace and Its Goddesses
as Fishmonger's Companion (voice)

Campfire Cooking in Another World with My Absurd Skill
as Adventurer C (voice)

Reborn to Master the Blade: From Hero-King to Extraordinary Squire ♀
as Knight (voice)

Chainsaw Man
as Henchman C (voice)

Bibliophile Princess
as Man at the Market (voice)

The Heike Story
as Taira Soldier 1 (voice)

Jujutsu Kaisen 0
as Passerby (voice)

The Faraway Paladin
as Villager (voice)

The Saint's Magic Power Is Omnipotent
as Young officer (voice)

Those Snow White Notes
as Ushio's Male Friend (voice)

Noblesse
as M-21 (voice)

The God of High School
as Doctor (voice)

Arte
as Apprentice (voice)

Vinland Saga
as Member of Askeladd's Mercenaries (voice)

Domestic Girlfriend
as Youth A (voice)

We Rent Tsukumogami
as Customer (voice)

Cells at Work!
as Intestinal Epithelial Cell 1 (voice)

The Ancient Magus' Bride
as Martin Chandler (voice)

Is It Wrong to Try to Pick Up Girls in a Dungeon? On the Side: Sword Oratoria
as Member (voice)

JOKER GAME
as Corporal Nobuteru Miyata (voice)

Flowers of Evil
as Class 1, Year 2 (voice)

Sword Art Online
as Player (voice)