Rin Shibuya is a 15-year-old female cool-type idol from Tokyo. She stands between 160cm and 165cm tall, weighs 44kg, and possesses black hair, green eyes, and blood type B. Her birthday is August 10th places her under the Leo zodiac sign. She resides with her family in their flower shop and sometimes helps her parents there. Her hobby involves taking walks with her dog.

Rin initially presents an aloof and cool demeanor, appearing serious or unfriendly, a trait she is self-conscious about. This exterior often makes her the "straight man" in comedic situations. However, she reveals a genuine, gentle, and earnest side once trust is established. She is hard-working and level-headed, though her seriousness can become humorous. Rin forms the central trio "New Generations" with Uzuki Shimamura and Mio Honda, their contrasting personalities driving group dynamics. Rin's relationships within this trio showcase her teamwork skills and gradual openness.

Her interactions extend to other idols like gothic lolita Ranko Kanzaki, passion-type Riina Tada, and mature Kaede Takagaki. These encounters sometimes challenge her typically composed nature, highlighting her adaptability in diverse social settings. Outside idol activities, Rin maintains a connection to her family's flower shop, grounding her in relatable responsibilities. Her development portrays a trajectory from a reserved individual to an idol capable of forming meaningful bonds while retaining her core diligence and introspection. She is noted as the first tutorial idol to achieve a CD debut, signifying her prominence within the project.