Danielle "Dani" Clayton is an American teacher is an American teacher who moves to London and is the current Governess of Bly Manor; by extension, she is the pseudo-parent and teacher to the Wingrave children, Miles and Flora. As she settles into her new role, Dani begins to experience strange and terrifying occurrences at the manor. Dani develops a close relationship with Jamie, the gardener, and must confront her own past traumas while trying to protect the children from the malevolent forces at Bly Manor.
Played by Oliver Jackson-Cohen
Peter is the manipulative business associate of Henry Wingrave. He eventually becomes involved with Rebecca Jessel, the Governess of Bly Manor, causing complications for the Wingrave family when the two become romantically involved.
Played by Amelia Eve
Jamie is the gardener at Bly Manor and becomes very close to Dani, the new governess of the manor. She is a kind and caring person, who is fiercely protective of those she cares about.
Played by T'Nia Miller
Hannah is the housekeeper at Bly Manor and is responsible for managing the day-to-day affairs of the estate. She is kind, caring, and maternal towards the children in her care. Hannah has a secret she doesn't know herself.
Played by Rahul Kohli
Owen is the chef at Bly Manor and is responsible for preparing meals for the household. He is friendly, humorous, and caring towards the other staff members and the children in his care. Owen acts as a confidant and friend to the other characters, providing a source of comfort and support in the midst of the supernatural events that take place at the manor. He also has a romantic interest in Hannah Grose, the housekeeper at Bly Manor.
Played by Henry Thomas
Henry is the uncle and legal guardian of the children, Miles and Flora, and the owner of Bly Manor. He is a cold and distant man who has little interest in the well-being of the children. Hnery is largely distant from life at Bly Manor due to past events.
Played by Amelie Smith
Flora is the younger of the two orphaned children who live at Bly Manor, along with her older brother Miles. Sweet, innocent, and imaginative, she often speaks to her dolls and plays games with her brother. Flora is aware of the supernatural occurrences at Bly Manor and has her own secrets that she keeps hidden. She is also protective of her brother and tries to shield him from the malevolent forces at the manor.
Played by Benjamin Evan Ainsworth
Miles is one of the two orphaned children who live at Bly Manor, along with his younger sister Flora. He is intelligent, charming, and manipulative, often using his wit and charm to get what he wants. Miles becomes increasingly violent and unpredictable as the series progresses, causing concern for his caregivers and those around him.
Played by Tahirah Sharif
Rebecca is the former au pair at Bly Manor, who was involved in a romantic relationship with Peter Quint, the former valet. Her character is often seen in flashbacks, as she forms a bond with the children in her care and tries to navigate the complexities of her relationship with Peter. She is also linked to the series' central mystery and the supernatural occurrences that take place at Bly Manor.