Frank is a character from the 1977 anime series Angie Girl, where he serves as the best friend of the protagonist, Angie Islington. His background establishes him as a boy of a similar age to Angie, and he is identified as the son of the household coachman, placing him in a different social standing from the noble Angie. Despite this difference in their family positions, he is a close and trusted companion who frequently accompanies her.

In terms of personality, Frank is portrayed as a loyal and supportive friend. He is a consistent presence by Angie's side as she pursues her interest in detective work, offering his assistance without reservation. His motivation stems from his friendship with Angie and a shared desire to help solve mysteries and thwart criminals, contributing to the goal of bringing peace back to their town alongside the official police force.

Frank's primary role in the story is as a key member of Angie's informal investigative team. While Angie is the brilliant young detective who receives recognition from the Queen, Frank provides steady support, helping her look for clues and navigate dangerous situations. The group he works with includes Inspector Jackson of Scotland Yard and Jackson's dashing assistant, Michael, forming a partnership that combines Angie's sharp intuition with official police resources. His most significant relationship is with Angie herself, as her loyal best friend. The information available does not provide extensive detail on a personal character arc or notable changes in Frank throughout the series. Similarly, while his loyalty and helpfulness are clear, there are no specific descriptions of unique or extraordinary abilities he possesses beyond being a dependable ally in Angie's investigations.