Rabbit, also known as the Moon Rabbit, is a celestial being residing on the moon in "The Princess and the Moon." Observing young Sophie's ill-tempered behavior, this entity travels down a moonbeam to Earth to confront her directly. The Moon Rabbit declares the moon's displeasure with Sophie's actions and spirits her away to the "Country of the Moon."

Within this lunar realm, the Moon Rabbit reveals to Sophie an alternate version of herself. This idealized Sophie, treated like a princess, embodies happiness, openness, and kindness, contrasting sharply with Sophie's real-world self. The Moon Rabbit clarifies that this princess represents Sophie as she would appear if consistently valued and respected. This revelation serves to teach Sophie the importance of treating others with compassion and recognizing their inherent worth.

Functioning as a moral guide, the Moon Rabbit emphasizes perspective's transformative power. It instructs Sophie to view others "as the Moon looks, with royal, bright and caring eyes," urging her to focus on people's positive qualities rather than their flaws. This lesson aims to instill empathy and appreciation for others.

Following this experience, Sophie returns to Earth with a renewed outlook. She commits to embodying kindness and patience, aligning her behavior with the princess-like qualities she witnessed. The Moon Rabbit's intervention catalyzes this change, positioning it as an agent of personal growth and ethical development. Its role is confined to the events described within the book.