Bo, also known as Boo, is a character from the popular animated film series Monsters, Inc. and Monsters University. She is a young girl who becomes friends with the monster Sully and his partner Mike Wazowski. Bo is known for her playful and adventurous spirit, which leads her to explore the monster world. In the films, Bo is depicted as a brave child who is not afraid of monsters. Her character represents innocence and the importance of friendship. The bond she forms with Sully and Mike highlights themes of courage and understanding across different worlds.