She is the daughter of Homer and Marge Simpson; Sister of Bart and Maggie.
The brightest kid in town (although this would be disputed by Martin Prince). Her hobbies include playing the saxophone. Lisa is one of the few vegetarians in Springfield. She is seen by some to whine at times or to have persistent sense of superiority that often grows into self-aggrandizement, and is often quite gullible despite her intelligence.
See: Characters from The Simpsons.