Sebastian is one of Brie's love interests, initially known as a human apprentice but later revealed to be a faerie prince. His hidden identity and complex intentions create tension and uncertainty in his relationship with Brie.

Finn is the true heir to the Unseelie throne and serves as a potential ally and love interest for Brie. His secretive nature and dedication to reclaiming the throne add complexity to his interactions with Brie.

Pretha is an ally of Finn who forms a tentative friendship with Brie. She is protective of her family, including her daughter, Lark, and shares a familial bond with Finn through her late husband.

Jas is Brie's younger sister, whose safety is Brie's main concern throughout the story. Her optimistic and sweet demeanor contrasts with Brie's more pragmatic nature.

Mordeus is the primary antagonist and the current Unseelie king, known for his tyrannical and manipulative actions. His conflict with Brie, Finn, and Sebastian drives much of the novel's tension.