Koki Uchiyama (内山 昂輝, Uchiyama Kōki) is a Japanese actor who specializes in voice acting. He is affiliated with Himawari Theatre Group. He won Best Male Rookie at 5th Seiyu Awards. He also received one of Best Voice Actors at Tokyo Anime Award Festival in 2015. Uchiyama's voice roles include Roxas and Ventus in the Kingdom Hearts series, Neku Sakuraba in The World Ends with You, Yuu Otosaka in Charlotte, Kei Tsukishima in Haikyu! !, Tomura Shigaraki in My Hero Academia, Rei Suwa in Buddy Daddies, and Meruem in Hunter × Hunter.