Takashi Nagayama was born on 16 November 1978 in Kanagawa, Japan. He is an actor, known for Kamen Rider Ryuki (2002), Kamen Rider Zi-O (2018) and Kakuseihunter Omegahorn (2026). His participation in the Junon Superboy contest was the catalyst for his acting debut. He mainly appeared in TV dramas such as "Astro Baseball Team", but gained popularity when he appeared in the musical "The Prince of Tennis" (as Eiji Kikumaru), and since then, he has been active mainly in musicals and stages. His reputation there was very high, and he himself continues to star in musicals. In addition to that, he also writes and composes his own lyrics and is also active as an artist.