Tris is a sixteen-year-old Divergent who originally transferred from Abnegation to Dauntless. She is small in stature but possesses a powerful personality, strong intuition, and a deep desire to help others. Finding herself trapped under a new authoritarian regime, she looks for a way to escape beyond the boundaries of Chicago to discover the truth about her world and her family's history.

Tobias, also known as Four, is a tough and capable former Dauntless instructor. He carries heavy emotional baggage from his abusive childhood and feels deeply conflicted about his warring parents. Though highly respected as a leader, he struggles with clinical anxiety, self-doubt, and the burden of understanding his own genetic identity.

Evelyn is Tobias's mother and the ruthless new leader of Chicago. She successfully orchestrated the downfall of the faction system and now forces the entire city to live as factionless under her strict rules. She relies on armed patrols and severe regulations to maintain law and order, prioritizing absolute power over the freedom of her citizens.

Marcus is Tobias's father and the disgraced former leader of Abnegation. Beneath his public persona of selflessness, he is a cowardly and abusive man who inflicted severe trauma on his family. He actively works against his estranged wife, Evelyn, by aligning himself with those who wish to restore the faction system.

Caleb is Tris's highly intelligent but morally compromised older brother. He initially chose Erudite and prioritized his intellect and survival over family loyalty. Consumed by guilt over his past actions, he struggles to earn Tris's forgiveness and prove he is capable of selflessness.

Christina is a former Candor transfer to Dauntless and Tris's closest friend. She demonstrates remarkable emotional maturity and resilience, having endured significant personal losses. She approaches the unknown world outside Chicago with a mix of trepidation and practical determination.

David is the leader of the Bureau of Genetic Welfare, operating from the former O'Hare Airport. He grew up in the fringe before rising to power within the Bureau. He views the citizens of Chicago as a successful scientific experiment and focuses his life's work on correcting genetic damage, often overlooking the humanity of his subjects.

Cara is a former Erudite citizen who uses her sharp intellect to help lead the Allegiant rebellion. She approaches the chaotic changes in Chicago with logic and pragmatism, organizing the expedition to cross the city fence and discover the source of their society.

Johana is the former representative of Amity who takes on a leadership role within the Allegiant. She remains in Chicago to negotiate and fight for the restoration of the faction system, proving herself to be a fair but determined leader willing to risk conflict to secure freedom for her people.

Peter is a notoriously cruel and self-serving young man who originally transferred to Dauntless with Tris. He joins the expedition outside the city primarily to escape the unrest in Chicago. He frequently instigates conflict within the group and struggles with his own inherent maliciousness.

Nita works in the laboratories at the Bureau of Genetic Welfare. She is officially classified as genetically damaged, a label that restricts her career and fuels her deep resentment toward the Bureau's leadership. She actively recruits sympathizers to help dismantle the organization's discriminatory practices.

Matthew is a researcher at the Bureau who assists in testing the genetic markers of the newly arrived Chicago citizens. While he appears to be a compliant employee, he harbors a quiet but intense hatred for the Bureau due to a past personal tragedy involving a genetically damaged loved one.

Natalie is Tris and Caleb's deceased mother. Though she died protecting Tris, her presence looms large as the group discovers she originally came from the Bureau of Genetic Welfare. She left behind a journal detailing her harsh childhood in the fringe and her eventual volunteer mission into the Chicago experiment.

Uriah is a Dauntless-born member of the group and a close friend to both Tris and Tobias. He leaves his family in Chicago to explore the outside world, bringing his characteristic energy and loyalty to the expedition.

Zeke is Uriah's older brother and a dependable member of the Dauntless community. He chooses not to join the expedition out of Chicago, preferring to stay behind in the city despite the ongoing factionless rule.

Hana is the mother of Uriah and Zeke. She represents the quiet resilience of the citizens trying to survive in the turbulent, post-faction environment of Chicago.

Tori is a former Dauntless tattoo artist who played a crucial role in bringing down Jeanine Matthews. Eager to escape the confines of Chicago, she guides the group through the dark toward their awaiting transport.

George is Tori's brother, a Divergent who was previously believed to have been murdered in Chicago. He actually survived and now lives outside the city limits, working alongside other rescued individuals at the Bureau.

Amar is a former Dauntless instructor who was presumed dead in Chicago for being Divergent. He faked his death with the help of the Bureau and now operates as a field worker, assisting in the transport and protection of the experimental subjects.

Zoe works for the Bureau of Genetic Welfare and serves as a welcoming figure to the group from Chicago. She helps orient the newcomers to the compound and provides Tris with crucial context about the sculptures and history of the facility.

Andrew is Tris and Caleb's deceased father. Initially an Erudite, he chose to transfer to Abnegation after growing disillusioned with his faction, a decision fueled by his budding romance with Natalie.

Reggie is a genetically damaged worker at the Bureau who assists Nita in her resistance efforts. He provides the Chicago group with historical evidence of the government's violent past to validate their rebellion.