Celia is a naturally gifted illusionist who possesses true magical abilities, including the power to manipulate physical objects and heal broken things. Forced into a brutal training regimen by her father, she prepares for a high-stakes magical competition against an unknown opponent. She wears a golden ring that permanently marks her skin and binds her to her rival.

Marco is a young magician taken from an orphanage and raised in complete isolation to prepare for a predetermined magical duel. His specific talent involves mental manipulation; he controls how others perceive reality and transports people into his imagination. Upon reaching adulthood, he moves to London and takes a job managing a theatrical producer's affairs.

Prospero is a famous stage illusionist who disguises his genuine magical abilities as mere sleight of hand. He believes true magic is an innate genetic gift rather than a learned skill. As a teacher, he is relentless and cruel, deliberately injuring his daughter to force her to heal herself and develop her powers for his proxy war.

Chandresh is a brilliant, wealthy, and eccentric theatrical producer in London. Driven by an obsessive desire to create a transcendent entertainment experience, he conceptualizes and funds the Night Circus. He hosts lavish midnight dinners to brainstorm ideas with fellow artists and requires constant assistance to manage his grand visions.

The Man in Grey is an ancient, mysterious practitioner of old magic who believes magical ability is a learned skill accessible to anyone willing to study. He dresses impeccably and shows no emotion toward his student, focusing entirely on preparing the boy for the competition against Prospero's daughter.

Isobel is a young tarot card reader living in London who possesses her own subtle magical abilities. She meets Marco shortly after his arrival in the city, leading to a quick romance rooted in their shared understanding of the supernatural. She uses her talents to observe the circus and monitor Marco's rival.

Bailey is a twelve-year-old farm boy living in Massachusetts who feels out of place in his everyday life. Dared by his friends to break into the Night Circus during the day, he encounters a performer and develops a lasting, lifelong fascination with the magical venue.

Poppet is a performer at the Night Circus, identifiable by her bright red hair. Born within the circus grounds, she possesses the unique magical ability to see into the future. She performs closely with her twin brother and feels a deep, protective connection to the circus environment.

Widget is Poppet's fraternal twin brother, also characterized by his bright red hair. Born within the boundaries of the Night Circus, he has the magical ability to read the past of people and objects. He performs alongside his sister in the circus tents and shares her intense loyalty to their home.

Herr Thiessen is a renowned German clockmaker known for his intricate, impossible designs. He is hired to build the central, dreamlike clock for the Night Circus. He later becomes an avid fan and chronicler of the circus, writing articles that attract audiences from around the world.

Tsukiko is a beautiful Japanese contortionist whose body is covered in a large snake tattoo. She is the first performer hired for the Night Circus after demonstrating an impossible physical routine. She possesses a mysterious past and quietly observes the developing magical competition around her.