Princess Kirara, also localized as Princesse Kimara, emerges as a central figure within Rose Mansion. This young, wealthy, and notably spoiled princess administers seven trials to potential suitors, promising her hand in marriage to any who succeed. She holds Kakeru's father captive during these events, offering his freedom solely upon Kakeru's completion of her challenges.

After Kakeru triumphs, Kirara transitions from antagonist to companion, joining him and Blink on their journey. Her presence introduces ongoing complications through frequent demands that disrupt the group's progress. In Blue Town, her insistence on obtaining a specific mysterious fruit leads Nitchi and Satchi to retrieve it, inadvertently releasing a magical child whose relaxing influence temporarily weakens the group's resolve to find Kakeru's father. Her uncle is identified as the Duke of Yellow Stone, governor of Yellow Town.

Kirara remains a consistent group member across numerous adventures, documented in at least twenty episodes. She participates in events at locations like Cobalt Island, where her wish for a luxurious dress is fulfilled, and Emerald Forest, where she aids in searching for clues about Kakeru's father. Her characterization emphasizes stubbornness and entitlement, often requiring others to cater to her desires.