Princess Mildred is a 21-year-old half-human, half-fae royal living in the human kingdom of Nephrym. Her mixed heritage makes her an outsider in her own home. She possesses a sharp wit and strong survival instincts. She relies on these traits as she faces a dreaded political betrothal to a notorious fae prince.

Prince Atakan is the reputedly heartless heir to the Seelie fae court of Ethermore. He flaunts his power and sexual experience to intimidate those around him. He treats his long-standing arranged marriage as a political annoyance, frequently clashing with his betrothed through hostile banter and intimidation.

King Vane is the ruler of the Unseelie fae court. His kingdom sits isolated behind impenetrable magical wards. He presents himself as solicitous and generous, offering luxurious comforts and attention to further his political goals against the rival court.

Princess Bernadette is the fully human princess of Nephrym and Mildred's older sister. She provides a grounding, affectionate presence in a court fraught with political tension. She worries constantly about her sister's safety in the faerie world.

King Garran is the mercurial ruler of the Seelie court of Ethermore. He resents his son's arranged marriage to a half-human and actively delays the wedding. He treats his family members as political tools rather than individuals.

King Juris is the human ruler of Nephrym. He genuinely cares for his daughters but prioritizes his kingdom's safety by forcing Mildred into a highly advantageous, yet dangerous, political marriage. He avoids emotional confrontations regarding the sacrifices he demands of his family.

Queen Agatha is the human stepmother to Mildred. She openly dislikes her stepdaughter, viewing the half-fae girl as a constant reminder of her husband's past infidelity. Her harshness provides a clear, unmistakable hostility in the royal court.

Phineus is a member of the Seelie court and a close companion to Prince Atakan. He frequently engages in affectionate bickering with the prince and uses flirtation to provoke reactions from those around him.

Pholly is a noble in the Seelie court and Phineus's twin sister. She harbors deep resentment toward King Garran for past injustices against her family and approaches court politics with a cynical perspective.

Elion serves as the castle steward at Ethermore. He assists Mildred with adjusting to her new environment and provides practical insights into the unending war between the fae courts.

Cordenya is King Garran's long-term consort. She survives the volatile Seelie court with relative stability and occasionally acts as a maternal figure within the royal household.

Ruelle is a fae woman and Atakan's current paramour at Cloud Castle. She views Mildred as a rival and uses pointed flirtation to assert her status in the prince's life.

Cerwin is King Vane's closest friend and confidant in the Unseelie court. He actively supports the king's political strategies while maintaining a cheerful, welcoming demeanor.

Daylia is the steward of the Unseelie castle who frequently takes the shape of a black cat. She provides Mildred with reading material and attempts to build a rapport with her on King Vane's behalf.

Meadow is a baby felynx, a magical feline-canine hybrid native to the Unseelie lands. The creature bonds quickly with Mildred, providing her with a rare source of unconditional affection.

Lord Stone is a Seelie lord who operates within the dangerous espionage networks between the two warring kingdoms. He praises Mildred's calculated boldness and watches the unfolding political drama closely.

Morona is a female fae who has maintained a long-term physical relationship with King Vane. She openly expresses her infatuation with the king and deliberately attempts to provoke jealousy in Mildred.

Royce is a human noble who marries Princess Bernadette. He deeply adores his wife and proves willing to leverage his political standing to support her family.

King Vorx is the late ruler of the Unseelie court whose cruelty toward his wife sparked the enduring conflict with the Seelie kingdom. His brutal legacy continues to shape the political motivations of his successors.

Queen Kalista is the former Unseelie queen whose flight from an abusive marriage initiated the long-standing war. Her defection to the Seelie kingdom remains a pivotal historical event for both faerie courts.