Ryo Yamada oversees student welfare and facilities as dormitory superintendent at Edel Rose Academy. He routinely cleans the baths and occasionally provides late-night instant meals for students, though he relies on others like Minato Takahashi for proper cooking due to his own inability. Late-night bathing is his established habit.

His past reveals a former Prism King title, earned by winning the Prism King Cup through exceptional talent. His career ended abruptly when Jin Norizuki fabricated a scandal involving underage misconduct and smoking, designed to remove him after he refused Jin's directives. Disgraced, he transitioned to supporting aspiring Prism Stars from behind the scenes at Edel Rose.

Born in Hakata Ward, Fukuoka City, he carries red-framed glasses in his breast pocket, a potential link to a recurring Pretty Rhythm character. His birthdate is September 24.