Lionel is a Black teenager attending Bluford High School in Southern California. He possesses exceptional athletic ability on the basketball court, which serves as his primary emotional outlet and source of confidence. In the classroom, he struggles with severe reading and writing difficulties that he carefully hides from his peers and family. He views a potential NBA career as his best opportunity to provide financial stability for his household.

Leroy works demanding hours as a truck driver to financially support his household while his wife is deployed overseas. He frequently stresses the necessity of formal education as the most reliable path out of their disadvantaged neighborhood. Though he can appear stern and distant, he cares deeply about keeping his family intact during his wife's absence.

Jamar works alongside Lionel at the local car wash. After quitting high school, he moved into an apartment with his older cousins. He actively encourages Lionel to drop out of school, projecting an image of independence and freedom from adult supervision, though his actual living conditions are chaotic.

Ms. Walker is an older neighbor and former teacher who maintains a long-standing friendship with Lionel's mother. She lives with the traumatic memory of her grandson Russell, who died in a neighborhood shooting years prior. She frequently speaks out against local violence and strongly advocates for the neighborhood's youth to remain in school.

Dontrell attends Bluford High School as Lionel's best friend and classmate. Unlike Lionel, Dontrell reads at grade level and lives with both of his parents. He maintains a realistic view of their school environment and often tries to steer Lionel away from unnecessary conflicts.

Aunt Mimi moves into the Shepard household to assist with daily management after Lionel's mother deploys overseas. She takes on domestic chores and monitors the children, though she lacks the strict authority of Lionel's parents.

Kendra is Lionel's younger sister. She lives at home with Lionel, their father, and Aunt Mimi. She possesses stronger reading skills than her older brother and assists him with his homework when he struggles to decode texts.

Lionel's mother serves in the military and is deployed overseas to generate necessary income for the family. Her physical absence leaves a massive emotional void in the household, heavily impacting her husband and children on a daily basis.

Mrs. Henley teaches English at Bluford High School. She assigns demanding poetry and essays to her students. Unaware of the true severity of Lionel's reading deficit, she interprets his avoidance tactics as mere behavioral issues and lack of effort.

Malika attends Bluford High School and shares an English class with Lionel. She interacts with him easily, openly discussing his athletic ambitions while maintaining a friendly, flirtatious dynamic.

Steve is a varsity basketball and football player at Bluford High School. He enjoys local fame among the student body but exhibits an aggressive, showboating demeanor during casual games, using his size to physically intimidate younger players.

Desmond is a student at Bluford High School and part of Lionel's friend group. He watches practice games with his friends and advocates for Lionel's abilities when older players dismiss him.

Cooper is Desmond's older brother and a basketball player at Bluford High School. He becomes highly frustrated by Steve Morris's disrespectful playing style and defends Lionel when physical altercations break out during games.

Coach Barber runs the basketball program at Bluford High School. He quickly recognizes Lionel's natural athletic talent on the court and encourages his participation, though he remains strictly bound by the school's academic eligibility requirements.

Denise is a colleague of Leroy Shepard. She visits the family home in the afternoon to bring food and express gratitude for their shared hard work. Her friendly demeanor and close working relationship with Leroy cause Lionel intense anxiety about the stability of his parents' marriage.

Felix is an older employee at the local car wash. Having previously dropped out of school, he now faces severe financial difficulties with a pregnant girlfriend and openly warns Lionel against leaving education behind.

Andre is Jamar's older cousin. He shares a messy, chaotic apartment with Jamar, where he spends his days watching television and listening to loud music rather than pursuing steady work.

Russell is Ms. Walker's grandson, whose tragic death in a neighborhood shooting occurred when Lionel was in seventh grade. Though no longer alive, his memory deeply haunts the community and serves as a constant reminder of the area's physical dangers.