Agnes is an eighteen-year-old clergyman's daughter who volunteers to work as a governess when her family loses their modest savings. Sheltered but highly principled, she steps into the working world with idealistic notions about shaping young minds. She quickly discovers the harsh realities of her position, facing unruly children and dismissive employers. She draws heavily on her strong Christian morals to maintain her composure and values inner integrity over superficial appearances.

Edward Weston is the serious, sincere new curate at the village church near Horton Lodge. He lacks independent wealth but possesses a strong sense of duty and compassion. He actively visits the sick and elderly in his parish, treating cottagers with genuine respect. His thoughtful sermons and quiet acts of kindness catch Agnes's attention, as his values align closely with her own.

Rosalie is the sixteen-year-old eldest daughter at Horton Lodge. She is exceptionally beautiful, temperamental, and entirely focused on securing a wealthy marriage. Viewing courtship as a game, she uses her charm to attract multiple suitors simply for the entertainment of rejecting them or testing her power. She lacks interest in serious intellectual or moral instruction, preferring to focus on fashion and social conquests.

Mrs. Grey is Agnes's mother, a practical and industrious woman who gave up her wealthy family background to marry a clergyman for love. When the family loses their money in a poor investment, she takes charge of the household economy with resourcefulness and cheer. She provides Agnes with a strong model of domestic competence and maternal care.

Richard is Agnes's father, a clergyman with a living in the north of England. He makes a disastrous financial decision to invest all the family's money in a shipping venture, which leaves them impoverished when the ship sinks. The shock and guilt over this loss severely impact his nerves and physical health.

Mary is Agnes's older sister by about five or six years. She receives her education at home alongside Agnes. When financial ruin strikes the household, Mary contributes to the family income by selling her watercolor paintings.

Mrs. Bloomfield is the wife of a prosperous tradesman and Agnes's first employer at Wellwood. She is a frigid, formal woman who expects Agnes to produce perfectly behaved children without offering any parental support. She constantly scolds Agnes for the children's bad behavior while refusing to let the governess implement meaningful discipline.

Mr. Bloomfield is a wealthy tradesman who established the estate at Wellwood. He is ill-tempered and loud, frequently yelling at his wife and his children. He treats Agnes with hostility and disrespect, scolding her when the children act out without offering any solutions.

Tom is the seven-year-old eldest child of the Bloomfield family. He is aggressive, disobedient, and physical with his sisters and his governess. Encouraged by the men in his family, he finds entertainment in trapping animals and torturing baby birds.

Mary Ann is the six-year-old daughter at Wellwood. She is incredibly stubborn and refuses to cooperate during lessons, often lying on the floor. She uses screaming tantrums as a weapon to summon her mother and get Agnes in trouble.

Fanny is the four-year-old youngest child of the Bloomfields. She acts docile and sweet when her parents are in the room but proves just as mischievous and disobedient as her siblings when left alone in the nursery with Agnes.

Uncle Robson is Mrs. Bloomfield's brother, who frequently visits Wellwood. He scorns female authority and actively encourages Tom's cruelty, gifting the boy a nest of birds to torture and laughing at Agnes's attempts to stop the violence.

The elder Mrs. Bloomfield is Mr. Bloomfield's mother. While she initially appears sympathetic to Agnes during a visit to Wellwood, she soon begins making passive-aggressive comments, openly questioning if Agnes is a proper person to teach her grandchildren.

Betty is the children's nurse in the Bloomfield household. She pities Agnes's difficult situation before she is ultimately dismissed by Mrs. Bloomfield for attempting to physically discipline the disobedient children.

Mrs. Murray is the fashion-conscious wife of a country squire at Horton Lodge. She views education purely as a tool to make her daughters socially attractive for marriage. She instructs Agnes to keep lessons easy and demands that the governess remain completely mild-tempered at all times.

Mr. Murray is the bluff, boisterous country squire who owns Horton Lodge. He is rarely present in the daily lives of his children or the governess, leaving the educational and domestic decisions entirely to his wife.

Matilda is the fourteen-year-old second daughter at Horton Lodge. She is an energetic tomboy who despises formal education and ornamental accomplishments, preferring to spend her time outside with the estate's horses and dogs.

John is the eleven-year-old son at Horton Lodge. Agnes finds him unruly and difficult to teach during their brief time together before he is sent away to formal schooling.

Charles is the ten-year-old son of the Murray family. He is his mother's favorite child, but Agnes finds his personality to be sly and malicious during the short time she attempts to teach him.

Mr. Hatfield is the vicar of the parish near Horton Lodge. He delivers severe, rigid sermons and openly courts the favor of the wealthy local families. He is highly ambitious and aggressively pursues Rosalie's attention, hoping to secure a wealthy match.

Nancy is an elderly widow who lives in a cottage on the Murray estate. She struggles with her eyesight and experiences deep spiritual distress, finding comfort when Agnes visits to read to her and when Mr. Weston listens to her concerns with genuine empathy.

Sir Thomas Ashby is the wealthy owner of Ashby Park. Although Rosalie herself considers him unattractive and possessing a questionable character, his title and massive estate make him her primary target for marriage.