Reid Graveheart serves as the deuteragonist and primary love interest, a round and dynamic character whose internal conflict mirrors Viv’s. As a former Brood demon, Reid is defined by the tension between his demonic heritage and his chosen path of redemption. The Brood Brand on his neck is a permanent symbol of a past he cannot escape, yet his actions demonstrate a complete rejection of that identity. He chooses not to take human souls, a decision that shortens his lifespan and lessens his demonic power, and aligns himself with hunters at Harker Academy. This deliberate self-limitation showcases his deep-seated loathing for his own nature and his commitment to a strict moral code. His role as a combat instructor is ironic; he teaches hunters how to destroy his own kind, positioning himself as a man caught between two worlds, belonging fully to neither.

Reid’s defining trait is his controlled and reserved demeanor. He presents a stoic, often severe exterior, which serves as both a defense mechanism against the prejudice he faces and a method of controlling his demonic instincts. This control is tested by Viv, whose presence elicits a primal hunger he constantly fights to suppress. When he reveals his horns or his eyes glow red, it is often in moments of extreme emotional duress or arousal, indicating that his control is tied to his emotional state. His past is one of trauma, having been raised by a monstrous father and having lost the woman he loved at the hands of his brother, Deacon. This history informs his protective nature, particularly toward Viv, as he sees in her a similar struggle against a predetermined fate and a shared loneliness.

Reid’s development is driven by his relationship with Viv. She is the first person who challenges his isolation and begins to see him not as a monster but as an individual grappling with his identity. His confession that “I don’t deserve you” reveals a deep vulnerability and self-loathing that lies beneath his tough exterior (407). By falling in love with Viv, he finds a reason to fight not just for redemption but for connection. His willingness to confront his brother, Deacon, and risk his life to protect Viv demonstrates his ultimate allegiance to his chosen family and his new purpose. Through his struggle, Reid embodies the theme of Accepting a Monstrous Self, suggesting that self-worth is found not in one’s origins but in the choices one makes and the loyalties one keeps.

Sophia Valentine is a key supporting character who serves as both a foil and a confidante to Viv. She is a static, round character whose defining traits are her unapologetic confidence and fierce loyalty. From the moment they meet, Sophia is open, hedonistic, and seemingly fearless, a stark contrast to Viv’s guarded and self-conscious nature. While Viv hides what she is, Sophia lives her life with a reckless abandon that disregards the judgment of others. Her immediate and unconditional acceptance of Viv’s aeon identity is an important turning point for the protagonist. Sophia provides a model for a different way of being a hunter: one that does not require self-loathing or isolation. Her friendship is a primary pillar in Viv’s discovery of a Found Family Over Blood Ties. Despite her party-girl persona and sometimes questionable decision-making, Sophia proves to be an incredibly loyal and reliable friend. She demonstrates her bravery and commitment during the wraith and zombie attacks, showing a depth and competence that belies her carefree attitude.

Peter Roydon is a supporting character who functions as the intellectual and emotional anchor of the new friend group. Characterized by his earnestness, intelligence, and gentle nature, Peter often is a source of exposition for the history and lore of Harker and the wider deviant world. Having lost his hunter mother before he could learn about his heritage, he shares a sense of orphanhood with Viv and finds a deep sense of belonging at the academy. His kindness is instrumental in making Viv feel welcome during her first days. Despite his considerable knowledge, Peter is physically timid and often anxious, a trait that contrasts with the aggressive confidence of many of his peers. His crush on Sophia highlights his more innocent and vulnerable side. His journey is one of finding his courage, moving from a character who relies on books and rules to one who is willing to stand and fight alongside his friends.

Elliot Thompson is a supporting character who embodies the archetype of the loyal and good-natured jock. Immensely strong and physically gifted, Elliot represents the more straightforward aspects of being a hunter. He enjoys the physical challenges of sparring and fighting, approaching his duty with a confidence that lacks Viv’s internal torment or Peter’s anxiety. Coming from a large family of hunters, he is comfortable in his identity and easily navigates the social world of Harker. He forms an immediate and platonic bond with Sophia, and their easy camaraderie helps integrate both Viv and Peter into a cohesive group. Elliot is a stabilizing presence, consistently supportive of his friends and always ready to stand with them in a fight. His loyalty and uncomplicated bravery make him a cornerstone of the group’s found family.

Penny Pine is Viv’s best friend and represents her primary connection to the mortal world. As a static and flat character, Penny’s main role is to embody the goodness, loyalty, and innocence that Viv feels compelled to protect. She is Viv’s chosen family before Harker, offering unconditional love and support that Viv does not receive from her mother or sister. The secrecy required by Viv’s double life creates a strain on their friendship, showing the personal cost of Viv’s duty. Penny’s eventual discovery of Viv’s lies, and the hurt it causes, is a major emotional conflict for Viv, forcing her to confront the consequences of her isolation. Penny’s presence in the narrative grounds Viv’s struggle, constantly reminding her of the human world she is fighting for.

Dean Edgar Driscoll is the primary antagonist of the novel. Initially presented as a gruff but respected leader, he is revealed to be a turned warlock secretly working for the High Thane. His character is a study in duplicity and resentment. Driscoll’s motivation stems from a deep-seated jealousy of Viv’s father, David Cadell, his former friend and teammate. He felt his abilities as a warlock were never valued as highly as a hunter’s, leading him to betray his own kind and join the Brood. As dean, he manipulates events at Harker, orchestrating the wraith and zombie attacks to cover his theft of the syrabraxa ingredients and kidnapping of students. He is ruthless and remorseless, sacrificing Kitty and Lyra in his quest to find a viable aeon host for the spell. His murder of Viv’s father and his subsequent hunt for Viv drive the central conflict of the story.

Operating under two identities, Fiona (in the mortal world) and Professor Gemeline Lisette (at Harker) is a dichotomous shifter and a secret mentor to Viv. As Viv’s sister-in-law Fiona, she appears as a stressed, high-strung museum curator who offers Viv a job out of familial obligation. As Professor Lisette, she is a severe, intimidating, and ancient-seeming academic. This dual role allows her to secretly guide Viv, first by bringing her to the Windsor, where the Harker gateway is located, and then by pushing her academically at the school. Entrusted by the Elders to watch over the Windsor, she lives a double life that parallels Viv’s own, though Fiona’s is one of duty rather than shame. Her ultimate reveal as a powerful hunter who has been protecting Viv all along reshapes Viv’s understanding of her own family and support system.

James Pine, Penny’s older brother and Viv’s boyfriend at the start of the novel, is a foil to Reid. He shows a safe, socially acceptable, and passionless life that Viv is trying to fit into. Blandly handsome and well-meaning, James is part of the wealthy, North of the Chasm world that Viv’s mother wants for her. However, he fundamentally misunderstands Viv, seeing her as someone who needs to be protected in a conventional, mortal sense. His desire to “fix” her and his discomfort with her life South of the Chasm highlight their incompatibility. His ultimate breakup with Viv is an important step in her journey of self-acceptance, as she sheds the life she was trying to perform in favor of one that is authentically her own.