Keldarion, the High Prince of Winter and master of Castletree, is initially introduced as an antagonistic figure—Rosalina’s captor. He’s a brooding, formidable figure whose icy demeanor and immense power establish him as the central authority in Rosalina’s new reality. His initial declaration to her father, “I am the master of this castle, and you are a trespasser and a thief” (27), demonstrates his rigid adherence to his own law and his immediate hostility toward intruders. As the Sworn Protector of the Realms, he carries an immense burden of responsibility, which is amplified by the curse that transforms him and his companions into monstrous wolves each night. His beast form is a physical manifestation of Keldarion’s repressed rage, isolation, and the immense power he struggles to control. Keldarion is a round and dynamic character whose harsh exterior conceals deep-seated pain and a protective instinct that slowly emerges through his interactions with Rosalina.

Keldarion’s character is defined by an internal conflict between his duty and his emotions. He is fiercely protective of Castletree and its inhabitants, yet he maintains a cold distance, convinced that he doesn’t deserve connection or redemption because of his past mistakes. This self-imposed isolation stems from a traumatic past, heavily implied to be connected to Caspian, the Prince of Thorns. Keldarion’s refusal to attend the solstice ball and his declaration that he would “rather die than have this curse broken” reveal a deep-seated self-loathing and a belief that his fate is sealed (325). He is a tragic figure, trapped not only by the Enchantress’s curse but also by a bargain with Caspian, symbolized by the frosted briar bracelet on his wrist. His harsh treatment of Rosalina reflects his misguided attempts to protect her from himself and the dangers of his world, including his own burgeoning feelings for her.

Keldarion’s relationship with Rosalina forces him to confront the very emotions he has suppressed for 25 years. While he begins as her jailer, he quickly becomes her protector, saving her from Farron’s beast and the goblins. These protective acts create a complex dynamic of dependency and attraction. His growing affection is revealed in small, often begrudging, acts of kindness: having the staff prepare her favorite foods, giving her his mother’s necklace, and reading with her when she is scared. His ultimate decision to free her by destroying the rosebush portal is a climactic act of self-sacrifice, driven by the belief that he is protecting her from a future with him and the machinations of Caspian. This decision underscores his tragic nature, as he pushes away the one person who has managed to penetrate his icy facade.

Dayton, the High Prince of Summer, serves as a charismatic and hedonistic foil to the other, more somber princes. He presents himself as a carefree playboy, more interested in drinking, fighting, and sexual conquests than in the responsibilities of his title or the gravity of the curse. His introduction in the hot springs, where he flirts openly with a naked Rosalina and refers to her as “Kel’s new pet” (80), immediately establishes his provocative and confident personality. His actions are driven by a desire to escape the grim reality of Castletree, whether through alcohol or fleeting romantic encounters. His beast form, a golden wolf tangled with seaweed and coral, reflects his connection to the sea and the wild, untamed nature of his realm and his personality.

Beneath his cavalier exterior, Dayton demonstrates a fierce loyalty and a protective instinct, particularly toward Farron and Rosalina. His intimate relationship with Farron is complex, blending deep affection with a seemingly casual approach to their physical connection. While he often teases Farron, his actions suggest a deeper bond and a desire to shield Farron from pain. His explosive anger when a fae man assaults Rosalina in the Summer Realm reveals a volatile and dangerous side, suggesting that his nonchalance is a carefully constructed mask. This act of brutal violence highlights that his laid-back demeanor can quickly give way to the ferocity of his beast form. Dayton is a round character, whose layers of joviality, loyalty, and underlying pain make him more complex than he initially appears.

Helen describes Farron, the High Prince of Autumn, as the most gentle, intellectual, and approachable of the four princes. His domain is the library, where he dedicates himself to researching the curse in hopes of finding a solution. He is the first prince to show Rosalina genuine kindness and empathy, quickly forming a bond with her over their shared love of books. However, Farron harbors a deep insecurity and fear regarding his beast form, a monstrous red-brown wolf covered in branches and rot. Unlike the other princes, he has little to no control over his beast, making him physically dangerous to others at night. This lack of control forces Keldarion to keep him imprisoned in the dungeon, a source of shame and sadness for the otherwise mild-mannered prince.

Farron’s primary conflict is the duality of his nature: the kind, scholarly fae versus the uncontrollable monster. He is deeply apologetic for his beast’s actions, and his relationship with Rosalina develops partly from his gratitude for her understanding and forgiveness. He serves as a key ally and confidant to her, sharing his knowledge of the curse and the politics of the fae world. His intimate, long-standing relationship with Dayton also reveals a passionate and vulnerable side, contrasting with his often shy and awkward demeanor. His journey involves learning to accept the monstrous part of himself while striving to overcome it.

Ezryn, the High Prince of Spring, an enigmatic and stoic figure, embodies the archetype of the dutiful protector. He’s rarely seen without his full suit of armor and helmet, a symbol of his commitment to his people and a physical manifestation of the emotional barriers he maintains. This concealment creates an aura of mystery and makes his motivations difficult for Rosalina to discern. In his initial interaction with Rosalina, he accuses her of being a spy and chokes her, demonstrating a ruthless, violent, and suspicious nature forged from years of fighting the encroaching darkness. His beast form, a black wolf adorned with bones and fungi, represents his connection to the cycle of life and death in the Spring realm and the ferocity he unleashes upon his enemies.

Across the novel, Ezryn reveals a strong moral compass and a capacity for care. He’s the one who moves Rosalina from the dungeon to a comfortable room and later uses his inherited magic of rejuvenation to heal her wounds when she’s attacked by goblins. He spends his nights patrolling the Briar and hunting the goblins that threaten the Vale. This relentless duty is his way of channeling his immense rage and sorrow connected to the loss of his mother. Ezryn is a round character who struggles with the tension between his violent impulses as a warrior and his inherent duty to protect and heal, making him a complex and formidable guardian of Castletree.

Lucas Poussin is a significant minor antagonist from Rosalina’s human life, representing the psychological imprisonment she endures before entering the Enchanted Vale. As her ex-boyfriend, he embodies a toxic and controlling form of masculinity. His past actions, particularly carving his name into her arm with a hunting knife, establish him as abusive and possessive. His reappearance in Orca Cove and his public marriage proposal are not acts of love but attempts to reassert ownership over Rosalina, whom he views as an object of “unique sort of beauty” (14). He is a static and flat character who serves as a catalyst for Rosalina’s journey. Her decision to abandon him mid-proposal to search for her father is her first significant act of choosing her own path over his control, setting the stage for her larger quest for agency and freedom in the fae realm.

Caspian, the Prince of Thorns, is the primary antagonist, a malevolent and manipulative fae lord from the Realm Below. His power is symbolized by The Briars and Thorns that are slowly strangling Castletree and sapping its magic. He is characterized by his seductive beauty, sharp wit, and profound cruelty. Caspian’s motivations are rooted in a deep, personal history with Keldarion, whom he torments with a unique and intimate viciousness. He uses psychological warfare, sending Keldarion’s former lovers to the castle and targeting the princes’ deepest insecurities. His actions are not just about conquering the Vale but about breaking Keldarion specifically. As a trickster and villain, Caspian’s appearance at the solstice ball is a calculated move to sow chaos and further his mysterious agenda, making him a formidable and unpredictable threat.