Armpit is a sixteen-year-old Black teenager living in Austin, Texas. After serving time at a juvenile correctional facility, he focuses on achievable goals like passing summer school, saving money, and avoiding violence. His physical size often causes strangers to view him with suspicion, but he is fundamentally gentle, honest, and fiercely protective of those he loves.

X-Ray is a fast-talking, optimistic seventeen-year-old who served time with Armpit. He drives a car with personalized license plates and constantly searches for quick ways to make cash. While he is deeply loyal to his friends, his impulsive nature and failure to consider consequences frequently drag Armpit into complicated situations.

Ginny is a bright ten-year-old girl living in the duplex next to Armpit. She has cerebral palsy, which affects her speech and balance, but she faces peer cruelty with quiet grace and patience. Her unconditional trust and joyful presence give Armpit a powerful incentive to succeed.

Kaira is a seventeen-year-old, phenomenally successful pop singer currently on a massive concert tour. Despite her fame and wealth, she is deeply lonely and feels isolated by the controlling adults managing her career. She yearns for genuine connection and normal teenage experiences away from her demanding schedule.

Jerome, who insists on being called "El Genius," is Kaira's manager and stepfather. He maintains rigid control over every aspect of her career and personal life, deliberately isolating her from her band and peers. He takes full credit for Kaira's success and constantly dismisses her artistic input.

Aileen is the highly efficient travel coordinator for Kaira's tour. She manages hotel bookings, aliases, and logistics, presenting a friendly and professional demeanor to Kaira and her mother. Beneath her cheerful exterior, she is a calculating planner with an acute understanding of the tour's financial mechanics.

Fred is Kaira's thirty-year-old, muscular bodyguard. Hired after Kaira received threatening letters, he accompanies her everywhere. Despite Kaira regularly venting her frustrations on him and calling him "Doofus," he remains steady, observant, and dedicated to his job.

Cherry Lane is the progressive, elderly mayor of Austin. She is observant and fair-minded, taking a personal interest in Armpit's efforts to rehabilitate his life. She is unafraid to use her political authority to challenge injustice and protect marginalized individuals from aggressive policing.

Detective Newberg is a young investigator with the Austin Police Department. Her approachable, smiling demeanor masks her sharp investigative skills and attention to detail as she works to untangle the ticket-scalping incident.

Jack is the owner of Raincreek Irrigation and Landscaping. He is a fair, observant boss who recognizes and rewards Armpit's strong work ethic and integrity, trusting him enough to offer a position to his friend.

Tatiana is a student in Armpit's speech class. She initially shows interest in him and his presentation, but her opinions are easily swayed by the gossip and assumptions of her peer group.

Felix is a professional ticket scalper who operates with a team. He understands the economics of supply and demand and views X-Ray and Armpit as amateur competition in the local market.

Moses is an imposing member of Felix's ticket-scalping crew. He serves as the physical muscle for their operations, intimidating competitors when business negotiations fail.

Armpit's mother works at a local supermarket. She is anxious and highly suspicious of her son following his time in juvenile detention, struggling to trust his efforts to reform.

Armpit's father works two jobs as a meter reader and a taxicab dispatcher. Like his wife, he maintains a strict, defensive stance toward Armpit, heavily monitoring him for signs of bad behavior.

Ginny's mother is a supportive and protective parent. Despite initial reservations about Armpit's criminal record, she quickly recognizes his gentle nature and trusts him entirely with her daughter.

Kaira's mother travels on the tour but remains largely disconnected from her daughter's emotional needs. She defers entirely to Jerome regarding business matters and dismisses Kaira's concerns.