Played by Nina Conti
Bea is Tom's older sister and is almost never seen without her hand puppet, "Monkey," whom she's been attached to — literally — for most of her life as a result of an early childhood trauma while visiting a zoo. She encountered a puffin "that was touching himself in an inappropriate way while looking directly at her" which she took as a personal affront. Originally recommended by a psychiatrist for therapeutic reasons, the hand puppet remains her constant companion and "inner voice" thirty-something years later. Although Bea doesn't initially share Tom's interest in their family's genealogy, she gets much more drawn into it as his journey progresses.