Yūki Aoyama

Genki's twin sister, a former pop idol who quit after being pressured to exploit her sister's disability for sympathy. She has low self-esteem, sometimes descending into a "world of paranoia" (as Genki calls it) in which she believes people hate her even if they're actually being friendly and kind. After being convinced to join the Cheer Fruits, she leads the performance of the theme song and plays Sein Blue, who hails from Hinano's sister city of Cuernavaca, Mexico.