Petra's six-year-old sister who assumes responsibilities beyond her years, including caring for their baby brother, while maintaining a kind and caring spirit.

The traditional grandmother of Petra, Amelia, and Luisito, who initially struggles with Petra's dreams but deeply cares for the family's wellbeing.

Petra, Amelia, and Luisito's father, taken by the Federales during the Mexican Revolution, who inspires Petra with his hope for a better life and emphasis on learning.

The deceased mother of Petra, Amelia, and Luisito, remembered for her kindness and the joy she brought to her family before her passing.

A white girl living in Mexico who becomes Petra's friend, teaching her how to spell and offering a chance to escape to America with her family.

A rebel captain who challenges societal norms and becomes a role model for Petra, encouraging her to join the revolutionary forces despite Petra's decision to stay with her family.

The baby brother of Petra and Amelia, representing hope and the family's aspiration for a safer life in America.