Originally serving as a villain under Noir in Kirakira Precure a la Mode, Bibury endured profound childhood loneliness. Noir exploited this by isolating her and extracting her Kirakiraru to create Iru, a doll companion. He presented Iru as a gift, deliberately fostering Bibury's dependence and unwavering loyalty.

As Noir's subordinate, Bibury projected a haughty, rude personality. Her distinctive gothic lolita aesthetic featured light green twintails, yellow eyes, and a black dress with puffy sleeves, red accents, and a headband. She constantly carried Iru, an eyeless brown or gray doll wearing a red hat. Her primary missions involved using Iru to spread malicious rumors, absorb Kirakiraru energy from people and sweets, and unleash monsters via "Relleno Negro" or "Noir Filling" attacks. She frequently mocked fellow subordinate Julio for his failures while actively seeking Noir's approval.

A critical confrontation at Cure Lumiere's altar sent Bibury and the Cures into the past. There, she discovered Noir orchestrated her childhood isolation. This revelation caused severe emotional turmoil, triggering Iru – revealed as a manifestation of corrupted Kirakiraru – to consume her. The Cures intervened, purifying her with the "Animal Go Round" attack. This dissolved Iru and severed Noir's influence over Bibury.

Following purification, Bibury's appearance softened: her hair darkened to teal, her skin lost its pallor, and her outfit incorporated white and pink accents with an apron. She began working as a waitress at Ciel Kirahoshi's restaurant. While retaining some bluntness, she developed genuine care for friends and a fondness for sweets. She later supported the Cures in the final battle against Noir, contributing her Kirakiraru to restore Elisio. By the series' conclusion, she was depicted living independently, occasionally interacting with allies like Grave.