El Pachuco is a mythic figure who serves as an omniscient narrator, a crooner, and the embodiment of pachuco pride. Wearing a fantastic zoot suit, he operates both inside and outside the story, controlling the action while serving as Henry's alter-ego and inner voice. He frequently punctures Henry's optimism with cynical truths about the justice system.

Henry is the twenty-one-year-old leader of the 38th Street Gang, described as tough, fiercely loyal, and older than his years. He dreams of a better future and plans to join the Navy, viewing the military as a rare opportunity for advancement. However, his life is derailed when he is unfairly arrested in the Sleepy Lagoon murder sweep.

George is a strong, middle-aged lawyer dedicated to defending marginalized communities. He steps in to represent the youths indicted in the Sleepy Lagoon murder. Though initially met with suspicion because he is white, he wins the gang's trust by demonstrating his commitment and speaking fluent Spanish.

Alice is a twenty-six-year-old reporter for the progressive press who joins the defense team for the Sleepy Lagoon suspects. Recognizing the injustice of the arrests, she pilots a newsletter for the inmates to keep them informed. She becomes deeply and emotionally invested in the case and in Henry.

The Press is a physical, theatrical manifestation of the sensationalized news media. Acting as a prosecutor during the trial, he aggressively distorts facts, uses racist framing to sell papers, and incites public panic against the pachuco youth.

Enrique is the patriarch of the Reyna family and works as a street sweeper. Having fought in the Mexican Revolution, he commands respect at home and urges his family to honor their heritage by speaking Spanish. Though he dislikes zoot suits, he is proud of his children and serves as a strict but loving father figure.

Dolores is the matriarch of the Reyna family. She is a no-nonsense woman who speaks her mind with humor and frankness. She disapproves of pachuco culture and barrio dances, and she harbors deep reservations about Henry's decision to join the military.

Lupe is Henry's younger sister and proudly identifies as a pachuca. She pushes back against her parents' conservative rules, questioning why she must dress modestly while her brothers wear flashy zoot suits. She socializes with the 38th Street Gang and loves her family deeply, though she enjoys teasing them.

Rudy is Henry's younger brother and a member of the 38th Street Gang. Living in his older brother's shadow, he often drinks too much and sparks conflicts that Henry must settle. He aspires to look sharp but cannot afford his own zoot suit, relying on Henry's promises for hand-me-downs.

Della is Henry's seventeen-year-old girlfriend. Kept on a tight leash by her strict father, she dresses modestly but runs with the 38th Street Gang. She is sweet but demonstrates quiet toughness, especially when pressured by authorities during the trial to testify against her boyfriend.

At twenty-three, Smiley is one of the older members of the 38th Street Gang, having co-founded it with Henry. Unlike the younger boys, he is married with a child, which gives him a more mature perspective and often leads to frustration with the gang's immature antics.

Joey is a seventeen-year-old co-defendant in the Sleepy Lagoon trial. Immature and playful, he often postures as tough but requires Henry's guidance to behave seriously during legal proceedings.

Tommy is a nineteen-year-old member of the 38th Street Gang and the only white member of the group. He fully immerses himself in pachuco culture, speaking the slang and expecting to be treated exactly like his Mexican-American peers by the justice system.

Elena is Smiley's wife and the mother of his child. She quietly attempts to support her husband and the gang by raising funds for their defense, despite her husband's proud objections to taking charity.

Bertha is Henry's cool and tough ex-girlfriend, bearing a tattoo and a bitter attitude toward Henry's new relationship. She actively participates in the social life of the 38th Street Gang and does not hesitate to challenge the men's machismo.

Rafas is the aggressive leader of the rival Downey Gang. Eager for violence, he actively provokes the 38th Street Gang whenever their paths cross, fueling the territorial disputes that define barrio street life.

Cholo is a member of the Downey Gang. Despite his gang affiliation, he demonstrates communal solidarity when he steps up to defend neighborhood girls from harassing military sailors.

Zooter is a member of the Downey Gang who prioritizes self-preservation, fleeing with his girlfriend rather than stepping in to protect local women during an altercation with servicemen.

Güera is a girl associated with the Downey Street Gang. She accompanies the gang leader and tries to manage his violent impulses when tensions rise with rivals.

Little Blue is a girl associated with the Downey Street Gang who retreats from conflict when military servicemen begin harassing people in the barrio.

Lieutenant Edwards is an arresting officer with the LAPD who plays good cop during interrogations. He recognizes Henry's leadership potential but cynically views the Chicano youths as inherently criminal, leveraging Henry's military dreams to extract a confession.

Sergeant Smith is the abrasive bad cop of the LAPD arresting duo. He is openly hostile and violent, demonstrating severe racial prejudice by referring to the suspects as animals and physically abusing them during interrogations.

The Cub Reporter acts as an agent of the media machine, eagerly capturing sensational photos and asking leading questions that inject false narratives about drugs and sex into the Sleepy Lagoon case.

The Newsboy works as a distributor for the media's biased narratives, yelling condensed, exaggerated, and racist headlines to stoke public fear and boost newspaper sales.

Judge F.W. Charles presides over the Sleepy Lagoon murder trial with blatant prejudice. Flippant and sarcastic, he systematically denies the defendants basic legal rights, ensuring they look disreputable to the jury.

The Bailiff is a court official who announces the details of the trial and physically manages the defendants, ultimately leading them away in handcuffs upon their conviction.

The Guard represents the oppressive prison system. He dehumanizes the inmates by calling them by their numbers or racist slurs, abuses his power to provoke them, and violates their privacy by reading their mail.

Swabbie is an American sailor who frequents pachuco dances. His military uniform grants him privilege; when police raid a party, he is allowed to leave freely while the Chicano youth are arrested.

Manchuka is a Japanese-American dancer and Swabbie's girlfriend. She enjoys the barrio nightlife but escapes legal scrutiny during the police raid thanks to her association with a uniformed sailor.

The Shore Patrolman is a Navy serviceman tasked with policing sailors. He displays heavy bias toward his fellow servicemen, protecting them even when they instigate trouble or engage in illicit activities in the barrio.

Ragman is a member of the rival Downey Gang who backs up the gang's leader during violent territorial disputes with the 38th Street Gang.

Hobo is a loyal member of the Downey Gang, ready to engage in physical altercations at his leader's command when rivalries flare up at social events.

Hoba is a member of the Downey Gang, functioning as muscle for Rafas when the group seeks to intimidate their rivals.

Blondie is a youth in the Downey Gang who supports the faction's aggressive posturing against the 38th Street Gang.

The Pimp is a local figure who manages girls selling their services to military men. His unbothered presence highlights the hypocrisy of authorities who ignore illicit activities involving white sailors while relentlessly targeting Chicano youths.