Rika Jōgasaki is a 12-year-old from Saitama, born on July 30. She sports blonde twintails secured with bows, chartreuse eyes, and stands 149 cm tall. Her yellow theme color aligns with her Passion-type idol classification, radiating energetic and enthusiastic traits. Every sentence she speaks ends with a distinctive white star symbol (☆).

Spontaneous and fiercely energetic, Rika openly idolizes her older sister Mika Jōgasaki. Embracing the gyaru subculture through Mika's influence, she initially became an idol to emulate her sister. Stubborn about her viewpoints, she occasionally threatens to bite the Producer if ignored. Her growth includes declarations of increased maturity, such as vowing never to flee from difficulties again.

Her hobbies encompass collecting stickers and insects. Notably, she holds a record for a 2-day, 13-hour temper tantrum.

Rika shares a close yet sometimes competitive bond with Mika, collaborating in the unit Familia Twin and the group Tropical☆Stars. She also participates in Decoration, Bom Dia, and LittlePOPS. Among her strongest friendships are Kirari Moroboshi, Miria Akagi, Mio Honda, Yuzu Kitami, Natalia, Ayame Hamaguchi, Shizuku Oikawa, Mirei Hayasaka, Koume Shirasaka, Anzu Futaba, and Asuka Ninomiya, with Mirei Hayasaka as her closest confidante. Rika shares her birthday with Tsubasa Ibuki.