Kate is a married woman in her early thirties who recently relocated to the Greenloop eco-community in the forests of Washington. Struggling with obsessive-compulsive disorder and a pervasive sense of anxiety about the world, she keeps a detailed journal at the direct request of her therapist. She views herself as passive and reliant on others for stability, but physical isolation forces her to adapt her thinking. Her initial desire for comfortable safety clashes with the harsh realities of the surrounding wilderness following the eruption of Mount Rainier.

Dan is Kate’s husband and a former tech entrepreneur who recently experienced a massive business failure in Los Angeles. Moving to Greenloop leaves him listless and unmotivated, a state he openly displays to his new neighbors. Raised in a privileged environment that shielded him from failure, he initially struggles to find purpose. When the community loses contact with the outside world, he redirects his energy into learning technical and maintenance skills to fix their failing home systems.

Mostar is the resident artist at Greenloop, sponsored by a corporate backer to develop 3-D glass printing technology. Named after her Bosnian home city, she survived a brutal military siege in the 1990s, giving her a highly practical and cautious worldview. Her blunt demeanor frequently clashes with the forced positivity of her neighbors. When crisis strikes, she immediately focuses on resource management, rationing, and physical defense.

Tony is the charismatic founder of Greenloop and a successful eco-entrepreneur. He built the community to prove that environmentally sustainable living can coexist with high-end luxury and modern convenience. Operating on a tech-industry mindset of rapid innovation, he prefers to focus on positive outcomes rather than emergency contingency plans. Following the eruption, he insists the community remain passive and wait for rescue services to arrive.

Alpha is the female leader of a troop of large, hominid predators occupying the forests near Mount Rainier. Displaced by the mountain's volcanic eruption and subsequent mudslides, the clan encroaches on the Greenloop community in search of food. The group operates on a strict social hierarchy dictated by physical dominance and aggressive posturing. Their motivations remain entirely ambiguous to the human residents, oscillating between evasive curiosity and extreme territorial hostility.

Yvette is Tony’s wife and the co-leader of Greenloop’s social scene. She emphasizes spiritual well-being, mindfulness, and meditation to maintain harmony among the residents. When the community is cut off from the outside world, she focuses entirely on managing her neighbors' emotional states rather than their physical security. She frequently shares stories of Oma, a protective wilderness spirit, to soothe anxieties.

Frank is Kate’s brother and a retired attorney for Cygnus, the company financing Greenloop. He orchestrates his sister's move to the isolated community, secretly hoping the remote setting will expedite the end of her unhappy marriage. He provides retrospective commentary on the events at Greenloop through interviews with a disaster management expert.

Josephine is a Senior Ranger with the National Park Service. Of Navajo descent, she possesses an extensive knowledge of regional wildlife, geology, and historical folklore. She investigates the aftermath of the Greenloop incident and provides expert context on animal behavior, survival psychology, and the logistical challenges of managing a natural disaster in the vast American wilderness.

Vincent is a Greenloop resident who adheres to a strict vegan diet. He views the surrounding forest as a peaceful environment and refuses to believe the encroaching creatures pose a physical threat. Operating under the assumption that all hominids share a desire for harmonious coexistence, he attempts to initiate friendly communication with the creatures in the woods.

Bobbi is Vincent’s wife and a fellow resident of Greenloop. She generally agrees with her husband's passive, peaceful approach to the encroaching crisis. Despite the community's agreement to share resources, she secretly hoards potatoes in her kitchen out of anxiety over their dwindling food supplies.

Carmen lives in Greenloop with her partner and their adopted daughter. She suffers from severe germophobia, which makes the unsanitary conditions following the volcanic eruption particularly stressful for her. Despite her anxieties, she proves willing to adapt and assist with physical community tasks as the situation grows more dire.

Effie is Carmen's partner and one of the core residents of Greenloop. She actively tracks the news via radio broadcasts following the eruption, attempting to stay informed about the military and emergency service deployments in the region. She proposes building a massive signal sign to attract passing aircraft.

Palomino is the adopted Rohingya daughter of Carmen and Effie. She is a nonspeaking child who communicates through gestures and expressions. The disruption of her routine frightens her, but she finds comfort in helping Kate plant beans in the newly formed community garden.

Alex is an academic and author who argues that civilization inherently corrupts humanity’s essential goodness. In practice, however, he suffers from severe panic attacks and a nervous constitution. When the community encounters evidence of large predators, he loudly insists they are merely dealing with bears, using his intellectual authority to enforce collective denial.

The unnamed editor is a disaster management expert who compiles the various documents, journal entries, and interviews that make up the narrative. Initially skeptical of the Sasquatch claims, he decides to publish the findings due to a deep-seated, childhood fascination with the Bigfoot mythos.

Consort is a large, male member of the Bigfoot clan who serves as Alpha's mate. He travels with the troop into the Greenloop perimeter, responding directly to Alpha's commands and participating in the group's coordinated foraging and intimidation tactics.

Scout is a smaller, highly agile member of the Bigfoot clan. The creature operates on the periphery of the human settlement, observing the residents and reporting back to the larger members of the troop when the humans attempt to leave their houses.

Gary is Frank McCray Jr.'s ex-husband. Despite the end of their marriage, he assists Frank in searching the harsh wilderness of the Cascade Range for signs of Kate following the disaster.

Hannah is Dr. Alex Reinhardt's sister and a lieutenant colonel in the IDF. Her written arguments advocating for intellect-driven aggression over passive reliance on others serve as a direct philosophical counterpoint to her brother's theories of peaceful coexistence.