Otie is a 12-year-old middle school student and an aspiring sprinter for the Defenders track team. He idolizes Olympian Carl Lewis and frequently uses his active imagination—specifically fantasies about time machines—to cope with social humiliations and family tension. After a botched attempt to cut his own hair leads to intense mockery at school, he seeks confidence through athletic validation and a coveted pair of expensive sneakers.

Charismatic and highly respected in Glass Manor, Otis Sr. is Otie's father and the co-coach of the Defenders track team. A former track star whose own Olympic dreams were derailed by a severe back injury from a car accident, he maintains a strong public image in the neighborhood. He frequently goes away on business trips, leaving him absent from Otie's daily life during critical moments of adolescence.

Sonya is Otie's hardworking and fiercely protective mother. She works a draining telemarketing job and strives to maintain a stable, orderly household for her family. Deeply concerned about the violence in their Glass Manor neighborhood, she strictly controls Otie's exposure to mature environments and keeps valuable possessions locked away securely in a safe cabinet.

Torrie is Otie's confident, deeply loyal best friend and a fellow sprinter on the Defenders. Raised by his grandmother, Torrie serves as a steadfast pillar of support for Otie at school and on the track. He demonstrates his unwavering friendship early on by drastically altering his own appearance in solidarity with Otie.

Coach Marvin is the co-founder and head coach of the Defenders youth track team. He provides a structured, disciplined sanctuary for the boys in Glass Manor, teaching them that effort and technique matter more than expensive gear. His steady mentorship anchors Otie during moments of self-doubt and family uncertainty.

Biscuit is a powerful, volatile figure in the Glass Manor neighborhood who leads the Clippers crew. Known previously as a local barber, he represents the dangerous allure and underlying threat of the local drug trade, funding his flashy lifestyle through illicit means. His presence in the neighborhood directly challenges the values promoted by the track team.

Quentin is a seventh-grade classmate of Otie's and a talented artist. Jealous after a teacher praises Otie's drawing over his own, Quentin uses his platform at the school's talent show to publicly mock Otie's uneven hairline, setting off Otie's desperate attempt to fix his appearance.

Goose, whose real name is Gordon, is Otie's neighbor and close friend who harbors a secret desire to join the track team. Caught between his childhood friendships and the pull of the street life—exacerbated by his older brother's involvement with the Clippers—Goose faces high-pressure surroundings that cause him visible anxiety.

Mr. Crampton is a local cabdriver who shares a warm, familiar connection with Otis Brody Sr. He drives a taxi with distinctive initials hanging from the rearview mirror and serves as a highly supportive figure for the Brody family during tense and uncertain moments.

Mr. Jefferson is Otie's math teacher. His impressive athletic display in the school gymnasium, performed while wearing a new pair of Air Jordan 3s, convinces Otie that the expensive shoes possess magical, gravity-defying properties.

Dudley Anderson is a well-connected track scout who previously helped Olympic sprinter Carl Lewis. His visit to evaluate the Defenders for the Junior Olympics drastically raises the stakes for Otie and his teammates, pushing them to their physical limits.

Poor Baby is Goose's older brother, who is heavily involved with the neighborhood's dominant crew, the Clippers. He serves as an errand boy for Biscuit, tying his younger brother closer to the dangers of the street.

Dennis is a fellow runner on the Defenders track team. He participates in team events, such as the car wash fundraiser, and shares the boys' collective aspiration for athletic recognition and new uniforms.