Kris Christopher is a lunar athlete who travels to the University Satellite to compete for the title of Cosmo Beauty. Originally from the moon, she belongs to a colony called the Biginners, a community that lives in deep harmony with nature and rejects advanced technology. She comes from a family of priests and is training to become a priestess herself, which grants her the ability to sense and communicate with spirits. This spiritual connection plays a significant role in her interactions with other competitors later in the series. On the satellite, she shares living quarters with Akari Kanzaki and Anna Respighi, alongside Gyubei, a cow she brought from her home, whose milk she considers essential to her survival.

Kris is among the most talented athletes in her class, with remarkable physical strength and endurance that place her at a competitive level near the reigning champion Lahrri. Her prowess draws the unwanted attention of Mylandah, another top contender, and sets up a rivalry that impacts the whole team. Initially, Kris presents a cool and detached demeanor, appearing to be solely focused on victory. Over time, however, her vulnerabilities emerge, particularly the pressure to uphold her family's reputation and her own unfamiliar emotions. Her competitive edge softens as she forges a deep bond with Akari; in the television series, this develops into a romantic attraction that is ultimately returned, and they share an empathic connection conjured through Kris's spiritual rituals in the final episodes. Through that relationship, Kris evolves from a solitary rival into a trusted ally, integrating her spiritual duties with her athletic ambitions.