Ryou Akizuki

Birthday: September 15
Three Sizes: 80-56-80

Ritsuko's cousin, though very soft-spoken compared to her. Ryo's actually a cross-dressing boy trying to pass himself as a loli idol, and keeps that as a secret from the other idols. His theme color is green, like Ritsuko. His character song is 'Dazzling World'.

(Sources: Wikipedia, idolmaster.jp)