Harmony is a 12-year-old aspiring journalist who relies on her reporting skills to process the unpredictable events around her, particularly following her parents' recent divorce. When she is forced into a relocation camp, she uses a makeshift press badge to maintain her focus and document the experience. She idolizes historical muckraking reporters and firmly believes that gathering facts brings order to chaotic situations.

Teddy is an 11-year-old aspiring filmmaker who interprets his life through a cinematic lens, formatting his diary entries as screenplays. Having lost his parents in a car crash as an infant, he feels immense internal pressure to create a meaningful feature film before reaching the age they died. He uses his camera equipment as a buffer to distance himself from the trauma of the sudden state evacuation.

Grandin is a 14-year-old rancher's son whose identity is deeply rooted in the land and agricultural labor. The mandatory evacuation strips him of his purpose and separates him from his father, leaving him desperate to find a way back home. He is stoic, highly observant of his environment, and far more comfortable tending to animals than engaging in conversation.

Ashanti is a 12-year-old competitive swimmer and aspiring doctor who uses Greek mythology to comprehend the world's unpredictability. During the chaotic evacuation, she finds herself sidelined by the stomach flu but quickly recovers to assist her physician mother in the camp infirmary. She approaches problems with a scientific, clinical mindset, seeking logical explanations for the physical distress she observes among evacuees.

Pax is Harmony's highly imaginative younger sister who refuses to process the evacuation in literal terms. She continually frames their displacement as a fantastical journey akin to *The Wizard of Oz*, assigning thematic roles to the older children and maintaining an unshakable belief that their circumstances are temporary. She acts as an emotional anchor for the group, representing the childhood innocence they wish to protect.

Evelyn, known affectionately as Gram, is Teddy's devoted grandmother and sole guardian. Drawing on her background in community theater, she attempts to counter the despair of Camp Rogers by organizing performances and establishing daily routines. Her resilience provides a contrast to the panic of other adults, though her adherence to official rules occasionally puts her at odds with Teddy's rebellious instincts.

General Giles is the commander of the Colorado National Guard, responsible for enforcing the massive, statewide quarantine at Camp Rogers. She delivers polished but vague official statements about invisible toxins, strictly managing the flow of information to the panicked evacuees while maintaining tight military control over the perimeter.

Ramón is an elderly former state capitol facilities manager who now works as a driver for the Incident Command leadership. With access to the inner workings of the military authorities, he acts as a quiet observer of the camp's operations. He offers genuine empathy to the displaced children, serving as one of the few adults willing to listen to their concerns without dismissing them.

Dr. Johnson is Ashanti's mother, a dedicated physician who immediately steps up to establish a medical clinic at Camp Rogers. She operates with clinical precision and empathy, quickly noting that many of the physical ailments presenting in the camp stem from profound psychological stress rather than actual exposure to toxins.

Pastor Addams is the mother of Harmony and Pax, a minister managing the emotional fallout of her recent divorce alongside her pastoral duties. Inside the camp, she joins forces with other faith leaders to coordinate relief efforts and advocate for the displaced residents, though she struggles to effectively communicate her own fears to her daughters.

Grandin's father is a fiercely self-reliant rancher who holds a deep distrust of government intervention. When deputies arrive to enforce the mandatory evacuation, his refusal to abandon his land and livestock results in him being separated from his wife and son, casting a long shadow over Grandin's experience in the camp.

Grandin's mother endures the harrowing evacuation process while masking her profound anxiety over her missing husband. In the camp, she attempts to remain optimistic for Grandin's sake, quietly enduring the slow-moving lines and bureaucratic uncertainty of their quarantine.

Ashanti's father helps navigate the chaotic early hours of the emergency relocation. Alongside his wife, he ensures that the family remains hydrated and calm on the frightening bus ride toward the unknown camp facility.

Governor Clark is the head of the Colorado state government, acting as the political face of the mass relocation effort. He works in tandem with the military to deliver highly managed press briefings about the supposedly uninhabitable zones, enforcing indefinite lockdowns while praising the evacuees for their patience.

Aunt Beckie is Harmony's aunt and an international journalist. Though she does not appear physically in the camp, she serves as an essential anchor for Harmony, who frames her entire experience by writing detailed, investigative letters addressed to her as a form of journalistic practice.

Popcorn is a small Labrador puppy rescued and nursed back to health by the camp's children. Named for the distinct smell of his paws, the dog becomes a vital source of comfort and purpose for the group, particularly Grandin, who misses the daily chores of his family's ranch.

Maddie is one of Ashanti's closest friends from Millerville. Their planned secret sleepover is derailed by the sudden statewide evacuation, leaving Ashanti to wonder where Maddie ended up when their community was suddenly scattered.