Granddaddy, whose full name is Jeremiah Granville Norfleet, is Ebony-Grace’s grandfather and mentor, inspiring her love for outer space through the stories he shares. He is a former NASA engineer and provides guidance to help Ebony-Grace navigate her imagination and reality.

Daddy, or Julius Freeman, is Ebony-Grace’s father, portrayed as a hard-working man who owns a brownstone and an auto shop in Harlem. He’s supportive yet tries to help his daughter find a balance between her imagination and reality.

Momma, or Gloria Norfleet, is Ebony-Grace's mother who is strict and concerned about her daughter’s future, urging her to be more realistic and behave in a more conventional manner.

Bianca has been friends with Ebony-Grace since childhood and is part of the Nine Flavas Crew. She sometimes joins Ebony-Grace’s imaginative play, though their friendship faces challenges due to Bianca’s growing interest in other pursuits.

A group that includes Bianca and other girls like Monique, known for enjoying activities like double-Dutch and rap. They attempt to include Ebony-Grace in their group despite differing interests.

Diane is an older teen who babysits Ebony-Grace for a brief period, providing her insight into older youth culture in the area.

Calvin is a character who challenges the girls by asserting gender boundaries in activities like breaking and rap. Pablo Jones, on the other hand, shares an interest in space with Ebony-Grace and becomes her friend.

Uncle Rich is Daddy’s younger brother, living in the same brownstone, and is characterized by his numerous relationships. He tends to humor Ebony-Grace’s imaginative activities.

Lester is depicted as a person experiencing homelessness and substance use challenges, whom Ebony-Grace encounters in Harlem, reflecting the community's social issues.