Lisa Simpson

Lisa Marie Simpson (born May 9th) (voiced by Yeardley Smith) is the tetartagonist of The Simpsons. She was named after a train called Lil' Lisa on her parents's 1st anniversary. She is a charismatic 8-year-old girl, who exceeds the standard achievement of intelligence level of children her age. Not to everyone's surprise, she is also the moral center of her family. In her upbringing, Lisa lacks parental involvement of Homer and Marge, which leads to hobbies such as playing saxophone and guitar, riding and caring for horses, and interest in advanced studies. In school, Lisa's popularity is affected by those who view her as a geeky overachiever, which leaves her with only a few friends. She focuses on her goals and strives to reach her potential, and at the age of eight she is already a member of MENSA with an IQ of 159.