Kōki Uchiyama (内山 昂輝, Uchiyama Kōki, born August 16, 1990) is a Japanese actor and voice actor. He is affiliated with Himawari Theatre Group. He played Roxas and Ventus in the video game series, Kingdom Hearts. Uchiyama played leading roles for each series, including Soul Eater Evans in Soul Eater, Banagher Links in Mobile Suit Gundam Unicorn, Zakuro Oshigiri in The Ones Within, Yoshino Takigawa in Blast of Tempest, Natsuno Yuuki in Shiki, Ichika Orimura in Infinite Stratos, Raku Ichijo in Nisekoi and Yū Otosaka in Charlotte.