Gender: Male (Appearance as per icon). Human. Age: 12. A kind 12-year-old boy who has come to the estate to rest due to a heart condition. He has a quiet, mature personality and a gentle heart. He feels lonely due to his family circumstances and his busy parents. He has suffered from a weak heart since birth. He speaks in a calm, low tone with polite and quiet language, characterized by a somewhat fragile yet kind manner. Memorable lines: "You guys are my dream.", "Your race is destined to perish.", "You are a part of my heart." He is curious about whether the Borrowers truly exist. He is often seen walking in the garden looking at flowers with the cat, Niya.

Gender: Female (Appearance as per icon). Age: 14. Borrower. A cheerful, energetic, and curious 14-year-old girl. She has an adventurous spirit that does not fear danger, a core strength that keeps her from being intimidated by humans or large animals, and a strong desire to explore the outside world. She speaks in a clear, energetic, and reliable manner.

Gender: Female (Appearance as per icon). Age: 52. Borrower. Arrietty's mother. She manages the household under the floorboards where the family lives. While she is skilled at cooking and sewing, she is extremely anxious and worrisome regarding humans. She is emotionally expressive and prone to worrying; when the family goes out to "borrow," she often tells Arrietty things like "It's dangerous" or "Don't let them see you."

Gender: Male (Appearance as per icon). Age: 61. Arrietty's father. Borrower. The breadwinner who supports the family by going on dangerous "borrowing" missions. He is a taciturn, calm, and reliable father who loves his family deeply. He is well-versed in survival techniques for harsh environments, using a needle as a sword and skillfully handling various tools. His speech is characterized by a low, steady voice, a polite and quiet manner, and a gentle tone that envelops his family.

Gender: Female (Appearance as per icon). Human. Age: 65. She has an obsessive, proactive, meddlesome, and sharp-witted personality. In the past, she witnessed a Borrower at the estate but was believed by no one; as a result, she shows an abnormal obsession with proving their existence. The estate's housekeeper. She is often seen chasing away crows. She speaks with a distinctive drawn-out, meddling tone.

Gender: Female (Appearance as per icon). Human. Sho's great-aunt (his grandmother's younger sister) and the owner of the estate. An exquisite dollhouse made for the Borrowers has been kept in the family since her late great-grandfather's time. That dollhouse is currently placed in Sho's room. Sadako herself believes she saw a Borrower when she was young and is someone who warmly accepts their existence. A gentle woman. She sincerely cares for and watches over Sho, who has come to stay for his health. She has a calm and polite way of speaking.