Cat's optimistic and curious younger sister who has cystic fibrosis and a keen interest in understanding her heritage and the concept of death. Her adventurous spirit influences the events and interplay among the characters.

A local boy in Bahía de la Luna who introduces the sisters to the town's supernatural elements and helps them explore their cultural heritage. His actions are central to Cat's growing acceptance of her new surroundings.

Cat and Maya's caring parents who focus on supporting Maya's health, playing instrumental roles in the family's discovery of their cultural roots. They indirectly aid in the sisters' journey through the narrative.

A spirited ghost with a friendly demeanor who serves as a guide and helper to Cat and Maya as they confront their fears and internal conflicts related to the concepts of life and death.