Fran Katzenjammer is a fictional character from the animated television series The Simpsons. She is known for her quirky personality and humorous interactions with other characters in the show. Fran often provides comic relief and adds to the show's satirical take on everyday life. In the series, Fran is depicted as a friend of Lisa Simpson, showcasing the challenges and adventures of childhood. Her character contributes to the themes of friendship and growing up, making her a memorable part of the show's ensemble cast.