Rikiya Koyama

In Demon Slayer: Kimetsu no Yaiba, the Ufotable-produced adaptation, Koyama provides the Japanese voice of Shinjuro Rengoku, the retired former Flame Hashira and father of Kyojuro Rengoku. The casting draws on the lower, weighty register that has defined much of Koyama's career, a quality that suits a hardened older swordsman carrying his own grief and disillusionment. The role places him within one of the most prominent franchises in modern anime, sitting alongside a career already filled with leading and supporting parts across long-running titles. For Koyama, who has spent decades moving between heroic mentors and imposing antagonists, Shinjuro offers a character that blends both, a once-great warrior whose bitterness masks a deeper sense of loss.

Born on December 18, 1963, Koyama works as an actor, voice actor and narrator and is affiliated with the Haiyuza Theatre Company. Across anime he has taken on a wide spread of memorable roles, among them parts in Hajime no Ippo, Utawarerumono, Kamen no Maid Guy and the Yakuza series. He is particularly recognized for voicing Yamato in Naruto: Shippuden, Ging Freecss in Hunter x Hunter, and the second incarnation of Kogoro Mouri in Case Closed, a role he has held since 2009. Koyama is also frequently cast as physically large or inhuman villains, including Coyote Starrk in Bleach, Fukuro in Fairy Tail and the Deep Sea King in One Punch Man, showcasing the commanding presence of his voice.

Beyond original anime roles, Koyama is a sought-after dubbing artist for Western film. He serves as the official Japanese dub-over voice for George Clooney, Kiefer Sutherland, Dwayne Johnson and Ma Dong-seok, and has additionally voiced numerous performances by Denzel Washington, Keanu Reeves and Guy Pearce. This steady demand from foreign-language dubbing, combined with his narration work, underscores his standing as one of Japan's busiest and most versatile voice performers, active in the industry since 1987.