Franny K. Stein is a fictional character from a children's book series written by Jim Benton. She is a young girl who aspires to be a mad scientist, often conducting quirky experiments and creating unusual inventions. Franny is known for her unique appearance, which includes wild hair and a penchant for wearing a lab coat. The series features Franny's adventures as she navigates school, friendships, and her love for science. Each book combines humor and creativity, making it appealing to young readers. The stories encourage curiosity and problem-solving, showcasing Franny's imaginative approach to challenges.