Lady Barbara is the grandmother and primary guardian of the protagonist, Angie, in the anime Angie Girl. She is depicted as a mature woman with gray hair who is frequently seen wearing a purple dress. Living in a noble household in Victorian-era London, she is the one who cares for Angie while the young girl's parents are often away on business for the Crown in the Indies.

In terms of personality, Lady Barbara is portrayed as a caring and loving guardian who is concerned for her granddaughter's well-being. She often finds herself in a position of worry and protest over Angie's passion for detective work and solving mysteries with Scotland Yard, preferring that the young girl focus on the typical, more refined pursuits expected of a young lady of her social standing.

Her primary role in the story is to serve as Angie's guardian and the lady of the household. She provides the domestic setting from which Angie embarks on her adventures. While she is not an active participant in crime-solving, she is a recurring character who accompanies Angie on various social outings and journeys, such as hunting trips and hot air balloon excursions, which often become intertwined with the mysteries Angie finds herself solving.

Her key relationships are primarily with her granddaughter, Angie, and their bond is central to her character. She also interacts with other members of the household and circle, including Frankie and the police inspector. Lady Barbara does not possess notable investigative abilities like Angie. Instead, her role is defined by her position as a nurturing, though sometimes apprehensive, family figure who supports her granddaughter despite her misgivings about the dangers of detective work.