An old woman and sister to the boy, she tells the story of the Borrowers to Kate and maintains a sense of wonder about their existence.

Mrs. May's brother, a sickly child sent to England from India, who may have met the Borrowers while recovering from rheumatic fever.

A bedridden old woman and the most sympathetic human to the Borrowers, known for dismissing them as hallucinations.

The housekeeper who is portrayed as one of the story’s antagonists, desiring to harm the Borrowers and treating the boy poorly.

The gardener often seen with Mrs. Driver, sharing in her negative views towards the boy and the Borrowers.

A skilled Borrower and family man known for his abilities as a shoemaker and climber, who adapts to the world to protect his family.

The adventurous 13-year-old Borrower who yearns for freedom and inadvertently endangers her family by interacting with humans.

The house-proud matriarch of the Clock family who remains cautious of the outside world and is worried about material possessions.

Pod's brother who moved his family after being discovered, leading to concern for their safety by the remaining Clock family members.

Borrowers who moved away after an encounter, who communicate with Arrietty through letters confirming their ongoing story relevance.

Various Borrower families once lived in the house, each with their own story, but have since disappeared or moved away.