Molly Mouse is a supporting character in the Hello Kitty universe, known for her kind and gentle nature. She is a small, friendly mouse who often appears as one of Hello Kitty's close friends. Molly is characterized by her sweet personality and supportive attitude, making her a dependable companion in various adventures. In the Hello Kitty series, she often helps the main characters solve problems and encourages teamwork, highlighting the importance of friendship and cooperation.