As the primary love interest, Henry is a compelling foil and eventual partner to Harlow. A dynamic and round character, he is initially presented as an obstacle in Harlow’s path, a man whose family she is supposed to spy on. However, he quickly reveals a complexity that mirrors Harlow’s own. His primary motivation is a decade-long quest for vengeance against the Carrenwell family, whom he blames for the death of his sister, Holly, and the destruction of his home, Mountain Haven. This drive places him squarely within the theme of Revenge as a Self-Destructive Pursuit, as his single-minded hatred initially blinds him to Harlow’s true nature, causing him to see her as “only meant to be a means to an end” (57). His journey is one of moving beyond this all-consuming goal as he comes to understand Harlow and the corrupt system she is fighting against.

Henry is defined by his own dual nature, which is reflected in his unique status as one of the “Deathless.” Having been resurrected by his mother’s magic, he cannot be killed the same way twice, a trait that makes him immune to Harlow’s poison and establishes the central dynamic of their relationship. This physical indestructibility is paired with a deep emotional wound from the loss of his sister, a trauma represented by his inability to see color. His world is literally black and white until he falls in love with Harlow, at which point color returns, symbolizing his emotional reawakening. Furthermore, Henry is twice-blessed, possessing both healing magic from Elvodeen and manipulation magic from Polm. He struggles to reconcile his gentle, protective instincts with the more brutal, “feral” side required to lead his people and pursue vengeance, a conflict that allows him to eventually understand Harlow’s own moral complexities.

His relationship with Harlow is the catalyst for his transformation. He is initially her antagonist, the target she is meant to kill, but their shared immunity and mutual secrets make them forge an unlikely bond. He is the first person to see beyond her violent exterior to the pain beneath, and his protective instincts are activated not by a sense of ownership but by a genuine recognition of her suffering. His act of killing Rafe is not just to protect Harlow but also an act of justice for Aidia, showing his shift in allegiance from his own narrow quest for revenge to a broader fight against abuse. By the end of the novel, Henry has moved from a man driven by his past to one focused on building a future, choosing partnership with Harlow over the isolated path of vengeance.

Although she is deceased for most of the novel, Aidia functions as the primary catalyst for the plot and Harlow’s character arc. Her presence, both in memory and as a ghostly manifestation of Harlow’s repressed grief, is constant. Aidia represents the ultimate victim of the Carrenwell family’s corruption and the systemic male violence that permeates Lunameade society. Married off to the abusive Rafe as a political pawn, her suffering is the direct impetus for Harlow’s secret life as the Poison Vixen. The recurring image of Aidia’s bruised face is a powerful symbol of the physical and emotional cost of her family’s ambition.

Despite her victimization, Aidia carries a fierce, defiant spirit. Unlike Harlow, who operates in the shadows, Aidia’s form of rebellion is to refuse to hide the evidence of Rafe’s abuse, wanting her family to witness the consequences of their choices. The secret verbal check-in she shares with Harlow, “My heart […] My bones […] Our blood” (5), symbolizes their deep, unbreakable bond and their shared experience of pain in a family where weakness is a punishable offense. Aidia’s final appearance to Harlow is not as a ghost but as a projection of Harlow’s own inner voice, encouraging her to let go of her guilt and embrace a future with Henry. This marks Harlow’s psychological integration of her grief and the true conclusion of Aidia’s role in the story.

Rafe is the novel’s primary antagonist, embodying systemic male violence and the corrupting nature of power. As the mayor of Lunameade and Aidia’s husband, he presents a charismatic and respectable public face that conceals a deeply abusive and manipulative nature. His character illustrates how powerful men can use their social standing to hide their private atrocities. His marriage to Aidia is a political alliance, but he uses it as an opportunity to exert brutal control, making him the direct catalyst for Harlow’s vigilantism.

Blessed by Polm, the Divine of Malice, Rafe’s manipulation magic is a direct extension of his psychological cruelty. He uses this power not only to control Aidia but to torment Harlow, culminating in the moment he forces Harlow to push her sister from a balcony. This act is the height of his sadism, as he derives pleasure from turning the sisters against each other. His political ambition is boundless; he constantly chips away at Harrick Carrenwell’s authority, and it is strongly implied that he may be the rebel leader Rochelli, stoking public dissent to further his own power. Because of his popularity with the city’s unblessed population, he is considered “untouchable,” forcing Harlow to seek indirect forms of justice. His eventual death at Henry’s hands provides a sense of catharsis, but it is his psychological hold over Harlow, rooted in the trauma he inflicted, that serves as his most lasting impact.

Kellan Carrenwell, Harlow’s older brother and the Captain of the City Watch, is a key ally and a moral compass within the corrupt Carrenwell family. He is a dynamic character who is initially torn between his duty to his family’s power structure and his genuine love and concern for his younger sisters, Harlow and Aidia. He protected them from their father’s wrath in childhood and continues to worry about their safety as adults, demonstrating a capacity for compassion that is largely absent in their parents and older siblings. His primary conflict is navigating his role within a system he knows is unjust.

This conflict is resolved with the revelation that Kellan is secretly Rochelli, the leader of the rebellion working to dismantle his parents’ tyrannical rule. This dual identity explains his actions throughout the novel, such as investigating the Poison Vixen while simultaneously understanding the societal failures that necessitate her existence. By taking responsibility for his parents’ deaths and establishing a more equitable system of governance in Lunameade, Kellan ultimately succeeds in Breaking Family Cycles of Abuse on a societal level. He is a new form of leadership based on transparency and genuine care for all citizens, not just the magically blessed elite.

As the ruling patriarch and matriarch of Lunameade, Harrick and Liza Carrenwell function as the story’s secondary antagonists and the origin point for the novel’s central conflicts. They are static characters, driven by an insatiable hunger for power and control. They view their nine children not as family but as assets to be deployed for political gain, marrying them off to secure alliances and using their magical abilities to eliminate threats. Their cold, calculating nature and complete lack of parental affection are the foundation of the abuse that shapes both Harlow and Aidia.

Harrick is the more overt abuser, using physical and psychological violence to control his children and forcing them to master their magic through torture. His cruelty reaches its apex with the revelation that he secretly kills any child in Lunameade blessed with holy fire to eliminate potential rivals, showing he is willing to murder infants to maintain his monopoly on power. Liza is a more subtle but equally complicit figure. Her retro-cognition blessing allows her to uncover the secrets of political rivals, making her an invaluable but insidious partner to Harrick. She enables his abuse through her inaction and emotional neglect, consistently prioritizing appearances and power over the well-being of her daughters. Their deaths at Harlow’s hands are the novel’s climactic event, representing a violent but necessary purge of the corruption at the heart of Lunameade and the ultimate act of severing a toxic family line.

Gaven Pomeroy is Harlow’s lifelong bodyguard and a complex guardian figure. His defining characteristic is his steadfast loyalty, but this loyalty is split between his charge, Harlow, and his employers, her abusive parents. This conflict creates a source of tension throughout the narrative. While he clearly cares for Harlow, his failure to protect her from her father’s abuse is a deep-seated guilt for him and a source of resentment for her. He is a man of few words, preferring to observe from the shadows, a trait that makes him an effective protector but also an emotionally distant one. His unique status as a man impervious to Divine blessings, combined with a magical brand that allows him to wield holy fire only when Harlow is in direct danger, makes him a far more formidable character than he first appears. His death is a significant turning point for Harlow, severing one of her last connections to her past and forcing her into greater reliance on Henry.