June is a fifteen-year-old former Republic prodigy who earned a perfect score of 1500 on her mandatory Trials. Raised in extreme wealth and privilege, she renounces her elite status to join the Patriot rebellion after uncovering the government's role in her family's deaths. She is highly observant and logical, though she struggles to adapt to the poverty of her new life and questions her shifting loyalties to both the Republic and the rebellion.

Day is a fifteen-year-old notorious criminal from the impoverished slums of Los Angeles. Wrongly convicted of murder, he survives his scheduled execution with June's help and seeks to rescue his younger brother from government captivity. He holds deep resentment toward the Republic's wealthy elite but fiercely protects the people he loves, driving his involvement in the rebellion.

Tess is a thirteen-year-old orphan who grew up surviving on the streets alongside Day. Abandoned by her parents at age nine due to poverty, she finds new purpose training as a Medic for the Patriots. She possesses a naturally caring disposition but harbors intense protective instincts over Day and his safety.

Anden is the young, newly appointed Elector Primo of the Republic. Unlike his predecessor, he desires to end the corrupt practices of the government, including the military Trials and plague experimentations. He faces heavy opposition from his own Congress and Senators as he attempts to reform the nation from the inside.

Kaede is a skilled pilot working for the Patriots. She operates heavily on financial motivation, often requiring payment before rendering assistance to anyone. Despite her cynical exterior and focus on money, she looks after younger members of the rebellion and provides crucial transportation through the air and underground tunnels.

Razor is a high-ranking leader within the Patriot rebellion who demands allegiance in exchange for medical care. He orchestrates a complex plot to assassinate the new Elector Primo. His access to excessive wealth and luxury raises immediate suspicions for June regarding his true identity and funding sources.

Thomas is a Republic soldier and former friend of the Iparis family. He prioritizes following orders above all else, leading him to commit violent acts against those he once cared about. He views June as a traitor to the nation and works tirelessly to suppress the rebellion.

Eden is Day's younger brother who suffers from a new strain of the plague. The Republic holds him captive to use his illness as a biological weapon against the Colonies, making his rescue Day's highest priority.

Metias is June's late older brother who served as her guardian. His murder at the hands of the Republic serves as the catalyst for June's rebellion, and his memory provides her with moral guidance during difficult decisions.

Commander Jameson is a ruthless, high-ranking military officer in the Republic. She previously commanded June and ordered the deaths of Day's family members, embodying the cold brutality of the Republic's leadership.

John is Day's late older brother who sacrificed himself to the Republic to allow Day to escape. The trauma of his televised execution heavily influences Day's hatred for the government and his desire for revenge.

Pascao is the leader of the Patriot runners. He idolizes Day's rebellious reputation and enthusiastically embraces the brutal tactics necessary to overthrow the Republic.

Baxter is a member of the Patriots who forms a connection with Tess. His aggressive behavior toward Tess leads to a physical altercation with Day, creating tension within the rebel ranks.

Sam is a young boy infected with the plague whom the Republic uses for biological testing. His tragic situation mirrors Eden's captivity, intensifying Day's anger toward the Elector.

Senator Kamion is a political leader within the Republic's Congress. He represents the established corruption of the government, pushing for severe military crackdowns on rebellious citizens rather than reform.