Notably, her increasing sense of moral righteousness regarding her vegetarianism leads her to proselytize, culminating in her spiteful disruption of a "meat-based" barbecue prepared by Homer (an act she comes to rue).
Not to everyone's surprise, she's also the moral center of her family.
In her upbringing, Lisa lacks parental involvement of Homer and Marge, which leads to hobbies like playing saxophone and guitar, riding and caring for horses, and interest in advanced studies.
She has a 'starfish' like hairstyle in the same style as her younger sister, Maggie.
Lisa's hairstyle's also a challenge for the animators to draw.
Lisa has a Jewish imaginary friend named Rachel Cohen who "just got into Brandeis University." Even with a high intellect, Lisa displays more personality traits of an eight-year old, including obsessing over getting a pony, being addicted to TV, and fighting with Bart.
Lisa once got addicted to second hand smoke to maintain an impressive level of ballet competence; Homer tries to prevent the addiction unsuccessfully, and in the end, Lisa overcomes the addiction herself through means of "Hello Kitty" nicotine patches.Although her rebellion against social norms is usually constructive, Lisa can be whiny, cruel and self-righteous at times.When she believes herself to be right, she won't admit others may be as well, and will force her beliefs on people.Lisa's quite eclectic in her knowledge and is notably more concerned with world affairs and problems than her cohorts.Lisa shares her intellect and overachieving personality traits with other female members of the Simpson family (revealed Simpson males inherit a gene on the Y chromosome preventing them from channeling their intellect), such traits aren't seen within the Bouvier family.In school, Lisa's popularity's affected by those who view her as a geeky overachiever, which leaves her with only a few friends.