Graves is a deuteragonist, an anti-hero, and Kierse’s primary love interest. He’s also the Holly King, a primordial winter god locked in an eternal struggle with his counterpart, Lorcan Flynn, who is the Oak King. As the strongest warlock of New York City, his power is rooted in knowledge, which he wields through a network of secrets and blackmail to manipulate the world around him. Initially, Graves is portrayed as “the villain of the age” (56), a controlling and secretive figure whose motivations are veiled. Having hidden Kierse’s Fae identity from her, he begins the story in a position of broken trust. His character development is defined by his gradual and deliberate effort to dismantle his own defenses and earn Kierse’s trust through transparency and vulnerability rather than through the command and control he has relied on for centuries.

Graves’s dynamic arc is driven by his relationship with Kierse. As the Holly King’s “wren,” she holds a mythological role as the source of his power and his potential destruction. While his instinct is to possess and protect her, he learns that true connection with her requires respecting her autonomy. His primary goal in the novel is to earn her trust, as demonstrated by the revelation that he cares more about redeeming himself in her eyes than in claiming the cauldron’s power for himself: “I would do everything in my power to prove that it is the woman that I want and not just the little thief” (133). As a result of his changed priorities, he transitions from hiding information to actively including her in his operations, teaching her to defend her mind, and even revealing deeply personal information from his past, such as the loss of his Druidic magic and the tragic death of his first love, Emilie. This evolution showcases his capacity for change and emphasizes the narrative’s argument for Love as a Deliberate Choice; he wins Kierse not through power or fate but by actively choosing to become a person worthy of her trust. His willingness to risk eating goblin fruit and confront his eternal enemy for her sake demonstrates a self-sacrificial loyalty that transcends his calculated nature. Graves’s love for Kierse compels him to act against his solitary and manipulative nature, creating a complex portrait of a centuries-old being grappling with change.

Lorcan functions as an antagonist, a foil to Graves, and Kierse’s secondary love interest. As the Oak King and the leader of the Brooklyn Druids, he projects an aura of charismatic, benevolent leadership, presenting himself and his order as protectors of balance and justice. He’s initially positioned as a more heroic figure than Graves, as he’s ostensibly driven by a desire to restore the historic allegiance between Druids and wisps. However, this seemingly noble motivation masks a self-righteous and controlling nature rooted in personal traumas like the loss of his wisp wife, Saoirse, and their two sons. His actions reveal that his belief in destiny and the greater good often is a justification for violating the agency of others.

Lorcan’s primary conflict with Kierse stems from their magical soulmate bond, which he views as a sacred, unbreakable destiny that entitles him to her allegiance and love. He believes that he’s acting in her best interest by trying to “save” her from Graves, but his methods become increasingly coercive, culminating in the forced binding ceremony. This act is the ultimate violation of The Sacredness of Personal Autonomy, as he strips Kierse of her magic and her choice in a misguided attempt to protect her. Kierse’s dialogue with him during the ceremony exposes his chief character flaws, particularly his hunger for control and his all-consuming rivalry with Graves: “[Y]ou prove time and time again that power is all you want. As long as he doesn't win, right? As long as you can prove you're better than him, nothing else matters” (426). He’s so convinced of his own righteousness that he can’t see that he has become the very type of monster he claims to oppose.

As the Oak King, Lorcan is at the height of his power during the summer solstice, a period that amplifies his connection to nature and his own magical abilities. His power dynamic with Graves is central to the plot, representing the cosmic struggle between summer and winter and between light and shadow. While he accuses Graves of being a manipulative monster, Lorcan engages in his own form of manipulation, using emotional appeals and the weight of their shared magical heritage to win over Ethan and pressure Kierse. His inability to accept Kierse’s rejection stems not only from the soulmate bond but also from his grief; he sees the reincarnation of his wife’s magic in Kierse and chooses to sacrifice her present agency in an attempt to reclaim his past.

Jason, whose true identity is the rogue Druid Cillian Ryan and who later operates as the Curator, is the primary antagonist of the novel. He’s a static, round character whose core motivation, the accumulation of power, remains unchanged. Kierse’s past was deeply impacted by Jason’s abuse and control. The revelation that he’s the same Druid who cast the spell on her as a child makes him the central villain of her life’s story. His actions are the ultimate expression of the violation of The Sacredness of Personal Autonomy; he preys on vulnerable magical children, using a spell disguised as protection to siphon their power for himself. He tells Kierse, “Power begets power” (410), revealing a self-obsessed preoccupation with his own strength.

Jason’s villainy is rooted in his belief that others are merely tools for his advancement. He attempts to justify his actions by claiming that he “saved” children like Kierse, but his words to her betray his callousness and manipulation: “You were never going to amount to anything. You weren't going to do anything except die like the rest of your kind. Just like the rest of my little ring of thieves” (409). The memory spell that he placed on Kierse makes him the architect of her stolen past and the source of her fragmented identity. The author explores the destructive consequences of his actions through the theme of Learning to Confront Trauma. Unlike Graves or Lorcan, who are driven by complex emotions like love and grief, Jason’s motives are purely selfish, making him a figure of unambiguous evil in the narrative. His eventual escape ensures that he remains a looming threat, one that Kierse is now personally driven to eliminate.

Gen is a key supporting character who functions as Kierse’s primary emotional support and a member of her found-family triskel. Raised as the daughter of a brothel madame, she possesses a worldly pragmatism that is balanced by a deeply empathetic and healing nature. Over the course of the story, she grows into her power as a High Priestess and a formidable healer. Her arc demonstrates a move from a largely supportive role to that of an active and capable participant in the central conflict. When the cauldron “chose” her, it amplified her healing abilities, allowing her to save herself from a mortal wound and solidifying her role as the triskel’s magical anchor. Her burgeoning relationships with both Niamh and Ronan also signify her personal growth and her exploration of a world beyond simply being Kierse’s protector.

Niamh is a mentor figure and represents the complex allegiances within the Druidic Order. As Lorcan’s “robin,” she is mythologically tied to the Oak King, but her loyalty isn’t absolute. Haunted by the death of her best friend and fellow triskel member, Saoirse, she’s wary of Lorcan’s obsessive tendencies. She initially befriends Kierse and Gen under Lorcan’s orders but quickly forms a genuine bond with them, choosing to train them in secret. Niamh’s ultimate decision to challenge Lorcan for the Oak Throne during the binding ceremony is a key moment. It demonstrates her unwavering commitment to free will over fated bonds, reinforcing the theme of The Sacredness of Personal Autonomy. By becoming the titular robin on the Oak Throne, she not only saves Kierse but also enacts a major power shift within the Druid world, positioning herself as a key political player.