Kierse is a master thief and the last surviving will-o'-the-wisp. Having recently discovered her Fae heritage, she operates independently to find a cure for her magically erased memories. She relies on her resourcefulness and carefully guarded emotions to survive in a dangerous supernatural society. Her primary drive is asserting her personal autonomy against powerful figures who wish to control her.

Graves is the Holly King and a formidable warlock operating out of New York City. He conceals his vulnerability behind a facade of control, utilizing a network of informants, wealth, and raw power to achieve his goals. He actively pursues the legendary Cauldron of Dagda while attempting to prove his loyalty to Kierse.

Lorcan is the Oak King and the charismatic leader of the Brooklyn Druids. He views himself as a righteous protector of magical balance, though this belief often masks his demanding and possessive nature. He claims a fated magical connection to Kierse, believing she possesses the reincarnated magic of his deceased wife.

Jason is Kierse's former mentor, a ruthless figure who ran an illicit thieving ring using vulnerable magical children. He views others entirely as tools for his own advancement and holds a self-obsessed preoccupation with accumulating power.

Gen is a budding High Priestess and the daughter of a New York brothel madame. She acts as Kierse's primary emotional support, balancing her friend's pragmatism with deep empathy and healing magic. She actively develops her powers in secret to better protect her chosen family.

Niamh is a powerful High Priestess and an agent for the Brooklyn Druids, mythologically designated as Lorcan's "robin." Despite her formal allegiances, she forms a genuine attachment to Kierse and Gen, secretly aiding them and questioning her leader's obsessive behavior.

Ethan is a young man seeking purpose and belonging, which leads him to undergo intense training with the Brooklyn Druids. The rigorous indoctrination process requires him to sever ties with his outside life, creating a painful rift between him and his closest friends.

Oisín is an ancient man cursed with agelessness following a stay in the fae realm. He runs a small bookstore that serves as an entrance to the dangerous Nying Market and acts as an informant, balancing multiple hidden agendas.

Known as the "Game Master," Estelle is the notoriously powerful warlock of Paris. She uses her vast wealth and opulent apartment building to orchestrate elaborate, high-stakes games, treating those around her as playing pieces in her strategies.

Aveline is the Queen of the Nymphs, holding court at the Palace of Versailles. She outwardly maintains the decorum of royalty while secretly engaging in intricate political games alongside her allies.

Nate is a werewolf pack leader and a stabilizing force in New York's fractured monster society. He offers Kierse unwavering friendship and seeks political power primarily to protect his pack and his future with his fiancée, Maura.

Maura is Nate's fiancée, characterized by her warmth and dedication to her partner. She bears an incubus curse that prevents her from having children, a painful reality that drives her allies to seek a magical cure on her behalf.

Lazarus, known as "Laz," is a tech expert and former intelligence operative working for Graves. He handles security systems, decrypts files, and monitors surveillance during the team's high-stakes heists.

George is Graves's loyal chauffeur and getaway driver. A former thrill-seeker, he manages logistics and transportation for the team, occasionally offering grounded advice to his employer.

Walter is a powerful warlock and Graves's former apprentice. He is recruited for his exceptional warding abilities and technological expertise to bypass advanced magical security systems.

Shannon is Kierse's mother, a will-o'-the-wisp who made desperate sacrifices to hide her daughter's magical signature. Her actions in the past form the core mystery of Kierse's repressed memories.

Adair is Kierse's human father. He willingly engaged with dangerous supernatural forces and traded his most prized possessions to keep his wife and daughter safe.

Vale is a charismatic, heavily armed mercenary who operates within the dangerous goblin markets. He exchanges his combat skills for rare magical armor and acts as crucial backup during dangerous extractions.

Rio is an information broker and bookkeeper in the goblin market. They deal in dangerous secrets and force clients to play high-stakes games or surrender vital personal information to secure answers.

Corey is Ethan's former boyfriend. He is deeply affected by Ethan's sudden disappearance into the Druid training program and relies on Gen and Kierse for updates.

Dr. Carrión is a psychiatrist specializing in monster-human mental health. She helps Kierse differentiate between magical memory blocks and psychological trauma walls.

Dr. Mafi is a medical professional at the monster hospital who feels indebted to Kierse. She focuses on the physical mechanics of magical trauma before referring patients to specialists.

Gregory is a wraith businessman and a former employer of Kierse. He operates within high-society events while secretly organizing an anti-human monster faction.

Lyra is a vampire and a prominent actress who uses her theatrical troupe to gain access to exclusive supernatural gatherings. She is quick-witted and insists on active participation in high-stakes operations.