The mysterious, vain, and magical new nanny at 17 Cherry Tree Lane. She maintains a stern, highly disciplined exterior but possesses incredible magical abilities, pulling large pieces of furniture out of an empty carpet bag. She insists on maintaining the standards of the upper classes while secretly bringing supernatural wonder to her charges.

The eldest of the four Banks children. She is generally gentle and observant, often stepping in to soothe situations when her younger siblings upset their new nanny. She possesses infinite curiosity about the strange occurrences happening around her.

Jane's younger brother. He is inquisitive, impulsive, and occasionally prone to deliberate bad behavior. Despite his talkative and sometimes challenging nature, he quickly grows deeply attached to his stern new caregiver.

The infant twins of the Banks family. During their first year of life, they possess a magical fluency that allows them to converse with sunlight, the wind, and birds. They playfully tolerate the human adults who speak to them in simplistic baby talk.

The mother of the Banks children. She is highly anxious about her social standing and easily manipulated by confident figures. She readily bends her own household rules when she fears appearing out of touch with the affluent upper crust of London.

The pragmatic father of the Banks children who commutes to the city for work. He is careful with his money and maintains a strict, practical outlook that sharply contrasts with the wondrous events occurring upstairs in his home.

A street artist and match-seller who maintains a close bond with the Banks family's new nanny. He is cheerful despite his poverty and knows how to access supernatural spaces, effortlessly transporting himself and his companion directly into his own landscape paintings.

An ancient, exceptionally small woman who runs a magical gingerbread shop. She freely breaks off her own regenerating fingers to feed the Banks infants, yet she verbally abuses her massive adult daughters.

The two enormously tall daughters of the gingerbread shop owner. They endure continuous verbal berating from their tiny mother while timidly assisting her with supernatural tasks.

A cheerful man who suffers from a condition where excessive laughter fills him with an uplifting gas. He eagerly hosts a tea party in mid-air for his visiting relatives.

A deeply rigid landlady who prioritizes her self-image above all else. She firmly rejects any exposure to the magical antics occurring in her rental property until she is accidentally swept up into them.

A wealthy, pretentious neighbor who treats her small dog with extreme, suffocating sentimentality. She relies heavily on her pet to show off her lavish, affluent lifestyle to the neighborhood.

A fluffy pedigree dog forced to wear leather boots and eat rich foods. He strongly resents his luxurious cage and actively rebels to spend time with a common street dog.

A large, unruly mixed-breed dog whose rough appearance appalls the wealthy residents of the lane. He benefits greatly from his smaller friend's firm loyalty.

A talkative bird who regularly visits the Banks household. He thoroughly enjoys conversing with the babies and expresses deep sorrow over the natural, tragic process of humans growing up and forgetting nature's language.

A wizened king cobra who serves as the undisputed lord of the zoo animals. He possesses immense philosophical wisdom, teaching visitors that predator and prey are fundamentally identical.

A celestial being from the Pleiades star cluster who descends to earth in human form. She visits London specifically to gather Christmas gifts for her sisters in the night sky.

A solitary figure who spends her days completely surrounded by doves and pigeons. She sells small bags of food to pedestrians, repeating a single marketing phrase to all who pass.

A highly proper animal whose rigid routine is shattered when a fallen star gets stuck on her horn, compelling her to dance uncontrollably for a week.

A monarch in a magical tale who attempts to solve supernatural problems by consulting his encyclopedia and aggressively ordering his courtiers about.

An animal who temporarily enjoys absolute freedom during the full moon. He happily guides human visitors through the upside-down world of the nighttime zoo.

The cook at 17 Cherry Tree Lane. She helps manage the children's daily needs and provides practical support to the busy household.