Calvin is a Black high school junior whose family decides to pass as white for survival and opportunity in a heavily segregated suburb. He is a talented trumpet player who feels immense guilt and stress over hiding his true identity. Resourceful and observant, he learns to survive the strict social rules of his new all-white high school while secretly spending time at an integrated music school.

Calvin's father is a World War II veteran who works in real estate. He is strict and determined, believing that passing as white is a necessary survival tactic and a way to secure the American Dream for his family. He demands that Calvin suppress his interest in jazz music and Black culture to maintain their cover in the deeply segregated community.

Calvin's mother is a quiet woman who struggles under the immense psychological pressure of their new life. Confined largely to her home due to the expectations of 1950s suburban housewives, she feels intensely isolated away from her community in Chicago and quietly mourns the loss of her previous life.

Robert is Calvin's older brother who lives in a nearby township. Unlike the rest of his family, his skin tone makes it difficult for him to pass as white. Having been disowned by his father following his civil rights organizing in Chicago, he now dedicates his time to teaching music to marginalized youth at his school.

Lily is a proud, courageous Black teenager living in the integrated neighborhood of Concord Park. When she enrolls at the all-white Heritage High, she faces severe harassment but refuses to back down or hide her identity. She values honesty and challenges Calvin's perspective on passing.

Darren is a deeply racist and aggressive student at Heritage High. He actively bullies anyone who challenges the all-white status quo of Levittown, taking particular pleasure in harassing Lily when she enrolls at the school. He is quick to violence and commands a group of followers.

Mr. Vernon is a prominent and powerful real estate agent in Levittown. He uses his company, Vernon Realty, to strictly enforce redlining and keep the community entirely white. He hires Calvin as an office assistant, unaware of the teenager's true identity or his access to the company's unethical files.

Charlotte is Calvin's deceased sister and Robert's twin. She was killed when a white mob firebombed the family's home in Chicago in retaliation for civil rights organizing. Her death casts a long shadow over the Greene family, heavily influencing their decision to pass as white.

Eugene is an 18-year-old orphaned musician who lives and takes classes at Sojourner. He plays the piano and forms an informal jazz trio with Calvin and his younger brother. Passionate about civil rights, he actively organizes to integrate local institutions and looks for ways to fight systemic inequality.

Harry is Eugene's 14-year-old brother and the drummer in their informal jazz trio. Like his brother, he found refuge at Sojourner after their parents died. He is enthusiastic about music but vulnerable to the racial hostility present in the surrounding towns.

Alex is a student at Heritage High who stands out from his peers due to his olive skin and quiet demeanor. He prefers reading comic books over sports and distances himself from the aggressive racism of his classmates. He becomes Calvin's closest ally at the school.

Ben is Calvin's neighbor and classmate at Heritage High. Eager to fit in, he frequently aligns himself with the school's bullies and adopts the prevailing racist attitudes of Levittown. He is talkative and highly invested in the social dynamics of his peer group.

Mary is a persistent and observant teenager living next door to the Greenes. She represents the intense surveillance of suburban life, constantly watching from her window and asking intrusive questions. She pursues a romantic relationship with Calvin despite his clear disinterest.

Barbara is a Black woman employed by Vernon Realty. The company uses her to systematically deny Black families housing in Levittown and redirect them to outside areas. She is perceptive, aware of the company's unethical practices, and observant of Calvin's actions in the office.

Sharon is a white employee at Vernon Realty who frequently asks Calvin to cover her duties so she can fulfill her strict domestic obligations at home. She unquestioningly follows Mr. Vernon's segregationist housing policies.

James is Robert's romantic partner who helps him run the Sojourner Music School. He is supportive and level-headed, providing a stable presence for the displaced students who rely on the school for safety and education.

Miss Brower is a teacher at Heritage High who expresses sympathy for Lily's situation but stops short of taking meaningful action. She believes the town is not ready for integration, showing the limits of her willingness to advocate for racial justice.

Ray is Calvin's dark-skinned best friend from Chicago. He represents the life, community, and safety Calvin left behind, serving as an emotional anchor to his past before the family began passing as white.

Bobby is a local activist who helps Lily apply to Heritage High but prefers to prioritize housing integration over school integration. He is cautious about risking his larger goals for individual students.

Virgil is a young activist who leads a Congress of Racial Equality (CORE) meeting. He advocates for new, nonviolent strategies in the civil rights movement and supports the efforts of emerging leaders to draw national attention to systemic injustice.

Thurgood Marshall is a prominent civil rights lawyer working with the NAACP. He travels to gather evidence of illegal housing and educational practices, seeking documents that prove systemic inequality to build legal cases against segregationists.