Kōsuke Toriumi is a Japanese voice actor born on May 16, 1973. He is affiliated with the talent agency Arts Vision and has been active in the voice acting industry since his debut in 1996. His early career involved minor roles in anime and video games, a common starting point for newcomers, before he progressed to more substantial and leading parts in the 2000s and 2010s.

Toriumi has built an extensive and diverse filmography across anime, video games, and original video animations. He is known for his versatile vocal range, capable of portraying a wide variety of character types, from cool-headed protagonists and rivals to humorous figures and memorable villains. Some directors have noted him as a go-to actor for roles requiring intense, impassioned screaming.

In anime television, some of his most prominent roles include Kiba Inuzuka in the long-running series Naruto, Guido Mista in JoJo's Bizarre Adventure: Golden Wind, Cecil Aijima in Uta no Prince-sama, Shunsuke Imaizumi in Yowamushi Pedal, Acnologia in Fairy Tail, Flashy Flash in One Punch Man, Szayel Aporro Grantz in Bleach, and Hajime Saitō in the Hakuouki series. He also voiced Gyokko in Demon Slayer: Kimetsu no Yaiba. Among his many roles are the two specified by the user: he plays Mikazuki Munechika in the Touken Ranbu franchise, including its anime adaptations such as Touken Ranbu: Hanamaru and Touken Ranbu Kai: Kyoden Moyuru Honnōji. He also voices Lǐn Xuě Yā (Rin Setsua in Japanese) in the puppet fantasy series Thunderbolt Fantasy.

His work in video games is equally prolific. He is well-known for voicing Yuri Lowell in Tales of Vesperia, Kaeya in Genshin Impact, Junpei Iori in the Persona 3 series, Zenos yae Galvus in Final Fantasy XIV, Nozel Silva in Black Clover, and Shadow Milk Cookie in Cookie Run: Kingdom. He has also voiced characters in fighting games such as Charlie Nash in Street Fighter V and Little Mac in the Super Smash Bros. series.

Throughout his career, Toriumi has been part of recurring collaborations and units. He is a member of the voice actor unit Nazo no Shin Unit Starmen and the musical unit PHERO☆MEN. He has also used pseudonyms, such as Spoon Sakiware, for voice work in R-rated works.

Notable achievements in his career include the release of a commemorative book titled Tekitō in May 2016 to mark the 20th anniversary of his debut. In March 2020, he launched his own YouTube channel called Torisan Gakkyū.