Clara, occasionally known as Glitter Klee in specific localizations, traces her origin to Alice Yotsuba. This 14-year-old possesses light brown hair and brown eyes. As the daughter of the Yotsuba conglomerate chairman, she hails from an affluent background. Despite her family's wealth and status, she nurtures genuine, enduring friendships with Mana and Rikka, bonds forged in elementary school when they defended her from classmates. Their monthly tea parties embody equality, where social standing never influences their connection.

Her demeanor consistently radiates friendliness, politeness, and openness, finding delight in simple pleasures like admiring flowers. Yet, she reveals sharp resourcefulness and unwavering resolve when protecting others, especially her friends, readily leveraging her family's vast resources if needed, a trait drawing comparisons to philanthropic figures. Childhood martial arts training under her grandfather Ichirou and the family butler Sebastian instilled a core principle: power must never be used frivolously or selfishly.

Transforming into her alter ego Cure Rosetta, she announces herself with "The warm, sunny Spot! Cure Rosetta!" This form specializes in defensive combat, focusing on protection. Her signature technique, Rosetta Wall, conjures a shimmering clover-shaped energy barrier adept at deflecting assaults. An advanced variation, Rosetta Reflection, significantly amplifies the shield's size and durability, transforming it into a solid obstacle capable of more than just defense. Both techniques demand intense concentration and considerable stamina for sustained use.

Her combat philosophy prioritizes safeguarding others, a direct reflection of her upbringing's emphasis on responsible power usage. This defensive focus strategically complements the abilities of her teammates during confrontations.