Sakuya Shirase is an 18-year-old former model originally from Kochi, now living in 283 Production's dormitories. At 175 cm, she holds the distinction of tallest idol in Shiny Colors. Her past is marked by loss: her mother died shortly after her birth, and her father passed away before she began modeling, leading to her upbringing by grandparents. She started modeling in her first year of high school and continued for two years until scouted by 283 Production's Producer, pivoting to idol work.

She attends an all-girls school where she excels academically and athletically while maintaining a model-like appearance. Her princely speech and demeanor, combined with her talents, garner significant popularity among female peers and fans. She frequently engages in flirtatious behavior, such as performing kabedon in card artwork or sharing intimate moments with unit members like lying in bed while locking eyes with Kogane Tsukioka. However, she becomes visibly flustered when receiving similar attention, as seen when Kiriko Yukoku calls her "cute," leaving her speechless.

Her personality revolves around bringing happiness to others, motivating her fan service and idol activities. She avoids showing vulnerability and rarely discusses her past, so few witness her weaknesses. Within her eccentric unit L'Antica, she acts as the voice of common sense. While not typically initiating unconventional situations, she participates flexibly when involved. Kiriko's stoicism uniquely unsettles her.

She fears insects and heights. Her hobbies include exploring diverse locations, and her skills encompass maintaining a "cool posture." She shares a birthday with fellow idol Ema Senzaki.