Mary Anne is a character from the popular book series The Baby-Sitters Club, created by Ann M. Martin. She is known for her shy and responsible nature, often taking on the role of the group's planner. Mary Anne is also characterized by her love for reading and her close relationship with her father, which influences her decisions throughout the series. In the series, Mary Anne is a member of the baby-sitting club alongside her friends, including Kristy Thomas and Claudia Kishi. Her character development showcases her journey from being timid to becoming more confident and assertive. Mary Anne's experiences highlight themes of friendship, growth, and the challenges of adolescence.