Kōki Uchiyama is a Japanese actor and voice actor born on August 16, 1990, in Saitama Prefecture, Japan. He began his career in entertainment at a very young age, joining the Himawari Theatre Group when he was just three years old, an agency he remains affiliated with today. His educational background includes graduating from Waseda University in 2013.

Uchiyama's first major role as a voice actor came in 2003 with the animated film My Sister Koomo-chan. He gained significant industry attention in 2005 for his work in the video game Kingdom Hearts II. His performance in the 2011 anime film Hotarubi no Mori e, where he voiced the lead character Gin, was a critical point in his career, and that same year he was honored with the Best Male Rookie Award at the 5th Seiyu Awards. His skill was further recognized in 2015 when he received the Best Voice Actor Award at the Tokyo Anime Award Festival.

Throughout his career, Uchiyama has portrayed a wide variety of characters, showcasing his range across different genres. He is known for playing intellectually sharp or stoic characters, such as Kei Tsukishima in the long-running sports anime Haikyu!!. He also frequently takes on more complex and darker roles, a prime example being Tomura Shigaraki, the primary antagonist he voices in the global hit series My Hero Academia. Another notable villainous role is Rui from Demon Slayer: Kimigayo no Yaiba. His versatility extends to protagonists as well, including Izumi Miyamura in the romantic comedy Horimiya and the title character in Takt Op. Destiny. He also voiced the lead role of Yū Otosaka in the original anime series Charlotte.

Uchiyama has built a career marked by frequent appearances in major animated productions and collaborations with various studios. He has voiced Akira Fudo in Devilman Crybaby, Benedict Blue in Violet Evergarden, and Toge Inumaki in Jujutsu Kaisen. He also provided the Japanese voice for the character Razor in the popular video game Genshin Impact. In 2022, he took on the role of Philip in the anime adaptation Fuuto PI, reprising a live-action character from the Kamen Rider franchise.

His recent and upcoming projects are extensive. In 2024, he voiced Kenichi Kohiruimaki in the two-part animated film Dead Dead Demon's Dededede Destruction. He is also part of the cast for the 2024 film Haikyu!! The Dumpster Battle. Uchiyama joined the cast of the hit anime Kaiju No. 8, providing the voice for the powerful First Division Captain, Gen Narumi, a role he is set to reprise in the previously announced second season. Among the other roles specified by the user, specific information regarding his parts in Farmagia, Captivated, by You, Sakamoto Days, and Dead Account was not detailed in the search results used for this profile.