Ryuki Takahashi (高橋 龍輝 Takahashi Ryūki, born 28 March 1993) is a Japanese actor. Takahashi is a member of D-BOYS. He is well known for his role as Ryoma Echizen in 5th cast of "Tennis no Oujisama ~ Musicals" and Kengo Utahoshi in Kamen Rider Fourze. He returns in Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle as the warlord of the Fourze Army. On June 8, 2016, he announced his retirement from the acting industry, citing health issues.