Cassidy is an idealistic and deeply loyal bookseller who works at Kellner Books. Raised by her grandfather, who sacrificed his personal dreams of travel for her upbringing, she carries a lingering sense of guilt and a strong desire to see the world. When she receives a magical volume that allows her to open any door to anywhere, her initial excitement blinds her to the potential dangers of her newfound power. She views the artifact primarily as a way to fulfill her grandfather's unlived adventures.

Isabelle is Cassidy's roommate and closest friend. She left her job at Kellner Books to sell fine jewelry, appreciating luxury and craving financial stability. When presented with a reality-bending artifact, her immediate reaction is practical caution. She raises valid ethical concerns about how such power could be abused and acts as a grounded counterweight to Cassidy's unrestrained enthusiasm.

Known within magical circles as "the Librarian," Drummond is an independently wealthy man who guards a vast collection of arcane texts. Haunted by the murder of his close friends a decade earlier, his default response to danger is evasion and hiding. He eventually steps out of the shadows to warn Cassidy and Isabelle that they are being hunted, forcing him to finally confront his tragic history.

Hugo is a physically imposing and heavily armed book hunter who aggressively tracks down magical volumes. He operates as a force of chaotic violence and uses physical torture to get what he wants. He targets the newly discovered artifact in New York and directly threatens anyone standing in his way.

Hjaelmer is a large, quiet man from a small Canadian town who initially works as a bodyguard. Often underestimated due to his silence and straightforward nature, he possesses a sharp awareness of his surroundings. Driven by simple wanderlust, he finds purpose in protecting those he cares about when the magical community descends into conflict.

The Woman is an unassuming but lethal figure who hunts down owners of magical texts. She operates with total silence during her attacks and isolates herself in a remote forest cabin when not actively hunting. She is methodical and utterly destructive, treating murder as a casual necessity to build her collection of dangerous artifacts.

Azaki is a magical practitioner who uses his abilities to win at cards and run minor scams. He hires protection after a bar fight goes wrong, preferring a life of comfortable avoidance over direct confrontation. Despite his questionable morals, he occasionally displays flashes of kindness toward others.

Based in New Orleans, the Bookseller acts as an independent intermediary in the dangerous world of magical artifacts. She organizes private, high-stakes auctions for wealthy collectors in hidden locations. She values her own survival and independence above all else and maintains a calculated distance from the violence that surrounds the items she brokers.

Mr. Webber is an elderly, wealthy former composer of television theme songs who frequents the New York bookshop where Cassidy works. He enjoys discussing travel and strongly encourages her to experience the world. Following his sudden death in the store, he leaves behind a mysterious volume that changes Cassidy's life forever.

Joe is Cassidy's late grandfather who raised her on his own, dedicating his life to work and bills rather than his personal dream of traveling the world. His death from cancer left a lasting emotional impact on Cassidy, heavily influencing how she approaches her newfound abilities.

Mrs. Kellner is the owner and manager of Kellner Books, the independent shop where Cassidy is employed. She provides standard oversight of the shop and possesses passing knowledge of the regular customers' daily habits.

Edmund Fox is Drummond's ancestor from the early twentieth century. Originally intending to become an explorer to escape a tedious life, he instead devoted his vast resources to hunting down and protecting magical texts, establishing a legendary hidden library.

Wagner was a scientifically minded friend of Drummond Fox who attempted to quantify and test the nature of magical texts. He approached arcane power with strict academic rigor, trying to understand forces he believed were simply undiscovered natural laws.

Lily was one of Drummond Fox's closest friends and an original member of his modern library circle. She spent her time categorizing magical texts and participating in lively intellectual discourse before falling victim to a catastrophic ambush.

Yasmin was a brave member of Drummond Fox's intellectual group. When their library was attacked, she stood her ground and fought back against overwhelming power using the artifacts they possessed.

Okoro is a highly dangerous and confrontational book hunter who attends private black-market auctions. He is aggressive, easily provoked, and ready to use extreme violence against rival buyers to claim powerful artifacts for himself.

Morgenstern is an elite collector of rare and magical volumes. He exhibits a dismissive and arrogant attitude toward those he views as less important, prioritizing the prestige of his rare acquisitions.

Marion is a London woman who inadvertently becomes entangled in the lethal hunt for magical artifacts. Even when faced with imminent death, she displays remarkable defiance against her attacker.