Darrell is a fifteen-year-old ninth grader who is small and skinny for his age. Forced to move away from his familiar home, he faces intense anxiety about fitting in at Bluford High School. He possesses strong empathy and a deep love for his mother. He frequently hides his own struggles, such as the extortion of his lunch money, to protect her optimism about their new life. He seeks to build physical strength and mental toughness by joining the wrestling team and reading survival literature.

Tyray is a tall, muscular ninth grader at Bluford High who uses his physical size to intimidate others. He demands weekly lunch money from weaker students and isolates his victims to maintain absolute control. He specifically targets Darrell for relentless harassment. He slashes Darrell's grocery bags and frequently trips him in the hallways, viewing the smaller boy as an easy target for extortion.

Jackie is Darrell's caring, hard-working single mother. She accepts a better-paying secretarial job in California after losing her position at an insurance agency in Philadelphia. She raises Darrell alone following her husband's death in a car accident. Her sacrifices motivate Darrell to hide his school troubles, as he desperately wants to preserve her happiness and optimism.

Amberlynn is a well-liked cheerleader at Bluford High who initially welcomes Darrell to the neighborhood. She worries deeply about her social reputation, which makes her afraid to publicly acknowledge Darrell once he becomes a frequent target for bullying. She feels immense guilt over her reluctance to stand up to peer pressure during classroom harassment.

Uncle Jason is Jackie's brother. He is a towering, muscular man who provides housing for his sister and nephew in his California duplex. He acts as a father figure to Darrell but holds rigid views on masculinity. He frequently makes unsolicited comments about Darrell's small stature and appetite, unintentionally worsening his nephew's insecurities about his body.

Travis is Uncle Jason's older son and Darrell's cousin. Slightly younger than Darrell but similar in size, he maintains a combative attitude at home. He frequently torments his younger brother using physical restraint and intimidation. He manipulates his father into believing he does nothing wrong, exploiting Uncle Jason's belief in rough play.

Nate is Uncle Jason's younger son. He is three years younger and substantially smaller than Darrell. He constantly falls victim to his older brother's physical harassment, including having his favorite toy race car deliberately destroyed. His helpless situation heavily resonates with Darrell, who steps in as a protector.

Malik is Darrell's childhood best friend in Philadelphia. As a tall, strong football player, he naturally shields Darrell from neighborhood harassment. He provides a safe space for Darrell to express emotion, offering comfort and understanding over a cheesesteak before the difficult move to California.

Rodney is a ninth grader at Bluford High who serves as Tyray's most vocal follower. He eagerly supports Tyray's intimidation tactics to impress the ringleader. He acts as a lookout, spotting targets in the school and reporting their activities back to maintain the group's dominance.

Harold is a quiet, introverted ninth grader at Bluford High. He struggles with extreme shyness, making him hesitant to initiate conversations or establish friendships. After his grandmother encourages a connection, he becomes Darrell's first genuine friend at the new school. The two boys eat lunch together to break their mutual isolation.

Kevin is a junior and the star wrestler at Bluford High. Despite his athletic prowess, he maintains a friendly and supportive attitude toward newcomers. He actively works to establish a safe atmosphere during practice, offering practical advice to less experienced teammates about using speed and strategy.

Mr. Mitchell is the English teacher at Bluford High who actively monitors his classroom's social dynamics. Having been small for his age as a youth, he easily identifies bullying patterns. He steps in to protect targeted students by moving them away from aggressors, and he recommends the survival novel Hatchet to help students develop inner resilience.

Coach Lewis leads the Bluford High wrestling team. He fosters an environment of mutual appreciation and camaraderie among the athletes. He values determination over physical size, teaching his students how to use their intellect and leverage to overcome significant physical disadvantages on the mat.

Miss Bea is a grandmotherly cafeteria worker at Bluford High. She works through constant back pain to clean up messes left by careless students, including deliberately spilled lunch trays. She deeply appreciates students who show empathy and offer physical assistance with her labor.

Jamee is a student at Bluford High and Amberlynn's close friend. She acts as a helpful intermediary, delivering apologies and explaining complicated social dynamics when direct communication becomes too difficult for Amberlynn. She directly encourages Darrell to attend the ninth-grade dance.

Mrs. Davis is an older woman in the California community. She provides Darrell with physical assistance and a kind word after witnessing his distress in the street. She demonstrates immediate kindness to a stranger and uses the interaction to advocate for her shy grandson.

Craig is a student in Darrell's weight class on the Bluford wrestling team. Though he easily overpowers newer athletes, he maintains the team's supportive culture. He offers praise and points out tangible improvements during practice matches rather than boasting about his easy victories.

Luis is a member of the Bluford wrestling team who regularly spars with new recruits. He focuses strictly on skill development and positive reinforcement, ensuring that inexperienced wrestlers feel welcome and respected despite losing practice bouts.