Lisa Simpson is a character from the animated series "The Simpsons." As a member of the Simpson family, she stands out for her intelligence, thoughtfulness, and activism. Often, she serves as the conscience of the family, caring about social, environmental, and political issues. Despite being a child prodigy and excelling academically, she sometimes struggles to fit in at school and find friends who share her interests. Her relationship with her brother Bart and her efforts to make the world a better place are recurring themes in the series.