Lonnie is a seventeen-year-old Black man and a highly talented basketball player living in Harlem. He splits his time between his mother's house and a room at the motel where he works, seeking independence. Harboring deep hurt over his father's abandonment, Lonnie struggles with trusting others and expressing his emotions, often using basketball as his primary outlet for recognition and success.

Cal is a washed-up former basketball player who takes on the role of coaching Lonnie's ragtag team for a new tournament. Initially appearing unkempt and unreliable, Cal is a complicated figure struggling with a troubled past that cost him his own sports career. He tries to impart life lessons to Lonnie while battling his own addictions and regrets over a devastating family tragedy.

Mary-Ann is a dynamic, independent sixteen-year-old who works inventory at a local club. As Paul's sister and Lonnie's girlfriend, she manages a difficult home life by establishing her own boundaries. She is fiercely loyal to Lonnie and continually challenges him to be vulnerable, operating as a strong voice of conscience and emotional support.

Tyrone runs the local after-hours club and serves as a dangerous, controlling force in the neighborhood. He is heavily involved in shady financial dealings, including stolen checks and gambling operations. He uses violence and intimidation to keep his employees and associates in line.

Aggie is Cal's partner, described affectionately as his "old lady." A highly talented former singer who never quite achieved professional success, she serves as a surrogate mother figure for Lonnie. Aggie models empathy and emotional openness, offering Lonnie guidance on surviving the difficult realities of the adult world.

Mr. O'Donnel is a wealthy white sponsor coordinating the upcoming basketball tournament. He uses his financial influence to exert control over the Black players and coaches in the league. He treats the community with condescension, prioritizing his own profit and status over the integrity of the sport.

Paul is Lonnie's longtime best friend and Mary-Ann's brother. He plays basketball with Lonnie's crew but begins spending time with a new set of friends and flashing uncharacteristic amounts of cash. His desire to impress others occasionally leads him into questionable associations and dangerous situations.

Lonnie's mother lives in Harlem and frequently clashes with her son. She often delivers sermons about the "trouble of this world," a heavy environment that prompts Lonnie to seek physical and emotional distance from her.

Lonnie's absent father, whose departure left a deep emotional wound on his son. His past comments about time passing and days "piling up" heavily influence Lonnie's worldview and fears about failing to achieve his own dreams.

Ox is one of the young men playing on the basketball team alongside Lonnie and Paul. He is a large, physically imposing teenager who surprises Lonnie by showing deep emotional sensitivity when his pet parakeet is killed.

Harrison is Lonnie's boss at the Grant motel. He allows Lonnie to stay in a room on the premises but keeps a strict eye on the property, acting as an authority figure who polices Lonnie's behavior while at work.

Ugly is a local store owner in the neighborhood where Lonnie cashes checks. He serves as an information source about local illicit dealings and is involved in buying stolen items from neighborhood youths.

Juno Rashid is a man from Cal's past who contacts Mr. O'Donnel to disrupt Cal's coaching position. He is connected to Tyrone and the illicit gambling operations that run parallel to the basketball tournament.