Morning Girl is an approximately ten-year-old Taíno girl who loves the early morning hours, swimming, and gathering flowers. She is thoughtful and highly observant of the natural world, often comparing her physical features to elements of her environment. She struggles with the typical frustrations of an older sibling, finding her younger brother loud and disruptive to her peaceful routines.

Star Boy is a young Taíno boy who prefers nighttime and darkness over the day. He is fascinated by stars, moonless nights, and bats, finding freedom and excitement when everyone else is asleep. Energetic and impulsive, he frequently acts out and gets into trouble, which puts him at odds with his quiet-loving older sister.

Mother is a nurturing and patient Taíno woman raising two very different children. She understands her son's mischievous nature and provides steady, unconditional affection to both him and her daughter. She expects a third child, an event that brings both excitement and tension to the household.

Father is a wise, quietly strong Taíno man who values family above material possessions. He uses humor to connect with his children, embracing their contrasting personalities. He holds a deep respect for his cultural values and the natural world, striving to pass these perspectives on to his family.

Sharp Tooth is the brother of Morning Girl and Star Boy's mother. He lives in the same community and occasionally interacts with his nephew. He sometimes offers teasing remarks that highlight the social expectations placed on growing boys in the village.

Red Feathers is a young Taíno boy who is Star Boy's best friend. He accompanies Star Boy on island explorations but is also influenced by the community's opinions, which sometimes creates friction in their friendship.

Never Cry is a boy in the Taíno community who attends local gatherings. He pays attention to the behavior of his peers and is quick to point out when others revert to habits from their early childhood.

Grandfather is a deceased Taíno elder and the grandfather of Morning Girl and Star Boy. Though he has passed away, his memory and spiritual presence remain a vital source of comfort and ancestral connection for his family.

Grandmother is an elder in the Taíno community and the mother of Morning Girl's mother. She represents the extended family network and provides a stable presence for the community.

The unborn third child of the family. Her anticipated arrival brings excitement to Morning Girl, who dreams of a peaceful life playing with her, but causes anxiety and frustration for Star Boy, who fears being replaced by another girl.