Question: Which character in the American animated sitcom set in the fictional town of Springfield, is named after the creator's younger sister?

Context paragraphs:
The Simpsons: The Simpsons is an American animated sitcom, aimed at adolescents and adults, created by Matt Groening for the Fox Broadcasting Company.  The series is a satirical depiction of working-class life, epitomized by the Simpson family, which consists of Homer, Marge, Bart, Lisa, and Maggie.  The show is set in the fictional town of Springfield and parodies American culture and society, television, and the human condition.

Rocko's Modern Life: Rocko's Modern Life is an American animated sitcom created by Joe Murray for Nickelodeon.  The series centers on the surreal life of an anthropomorphic Australian-immigrant wallaby named Rocko as well as his friends: the gluttonous steer Heffer, the neurotic turtle Filburt, and Rocko's faithful dog Spunky.  It is set in the fictional town of O-Town.  Throughout its run, the show was controversial for its adult humor, including double entendre, innuendo, and satirical social commentary, similar to "The Ren & Stimpy Show".

Springfield (Universal Studios Florida): Springfield is a themed area at the Universal Studios Florida theme park in Orlando, Florida.  The area is themed around the fictional town of the same name from the American animated sitcom, "The Simpsons".

Springfield (The Simpsons): Springfield is the fictional town in which the American animated sitcom "The Simpsons" is set.  A mid-sized town in an undetermined state of the United States, Springfield acts as a complete universe in which characters can explore the issues faced by modern society.  The geography of the town and its surroundings is flexible, changing to address whatever an episode's plot calls for.

List of The Simpsons video games: "The Simpsons" is an American animated television sitcom created by Matt Groening for the Fox Broadcasting Company.  The series is a satirical parody of a middle class American lifestyle epitomized by its eponymous family, which consists of Homer, Marge, Bart, Lisa and Maggie.  It is set in the fictional town of Springfield, and lampoons American culture, society and television, and many aspects of the human condition.  The family was conceived by Groening shortly before a pitch for a series of animated shorts with producer James L. Brooks.  Groening created a dysfunctional family and named the characters after members of his own family, substituting Bart for his own name.  The shorts became a part of "The Tracey Ullman Show" on April 19, 1987 and after a three-season run, the sketch was developed into a half-hour prime time show and became a hit series for Fox.  The growing popularity of the series motivated video game developers to create video games based on the series.  Two pinball machines have also been produced; one self-titled, that was only made available for a limited time after the first season finale (1990) and "The Simpsons Pinball Party" (2003).  Additionally, several handheld device games have been released, such as "Bartman: Avenger of Evil" (1990) and "Bart Simpson's Cupcake Crisis" (1991).

Springfield (Universal Studios Hollywood): Springfield is a themed area at the Universal Studios Hollywood theme park near Los Angeles, California.  The area is themed around the fictional town of the same name American animated sitcom, "The Simpsons".  It opened on May 13, 2015 adjacent to The Simpsons Ride.

List of The Simpsons home video releases: "The Simpsons" is an American animated sitcom created by Matt Groening for the Fox Broadcasting Company (Fox).  The series is a satirical parody of a middle class American lifestyle epitomized by its eponymous family, which consists of Homer, Marge, Bart, Lisa and Maggie.  The show is set in the fictional town of Springfield, and lampoons American culture, society and television, and many aspects of the human condition.  The family was conceived by Groening shortly before a pitch for a series of animated shorts with producer James L. Brooks.  Groening created a dysfunctional family and named the characters after members of his own family, substituting Bart for his own name.  The shorts became a part of "The Tracey Ullman Show" on April 19, 1987.  After a three-season run, the sketch was developed into a half-hour prime time show and became a hit series for Fox.

Lisa Simpson: Lisa Marie Simpson is a fictional character in the animated television series "The Simpsons".  She is the middle child and most intelligent of the Simpson family.  Voiced by Yeardley Smith, Lisa first appeared on television in "The Tracey Ullman Show" short "Good Night" on April 19, 1987.  Cartoonist Matt Groening created and designed her while waiting to meet James L. Brooks.  Groening had been invited to pitch a series of shorts based on his comic "Life in Hell", but instead decided to create a new set of characters.  He named the elder Simpson daughter after his younger sister Lisa Groening.  After appearing on "The Tracey Ullman Show" for three years, the Simpson family were moved to their own series on Fox, which debuted on December 17, 1989.

List of The Simpsons episodes: "The Simpsons" is an American animated television sitcom created by Matt Groening for the Fox Broadcasting Company.  It is a satirical depiction of a middle class American lifestyle epitomized by its eponymous family, which consists of Homer, Marge, Bart, Lisa, and Maggie.  The show is set in the fictional town of Springfield, and lampoons American culture, society, and television, as well as many aspects of the human condition.  The family was conceived by Groening shortly before a pitch for a series of animated shorts with producer James L. Brooks.  Groening created a dysfunctional family and named the characters after members of his own family, substituting Bart for his own name.  The shorts became a part of the Fox series "The Tracey Ullman Show" on April 19, 1987.  After a three-season run, the sketch was developed into a half-hour prime-time show that was an early hit for Fox.

The Simpsons: Virtual Springfield: The Simpsons: Virtual Springfield is a Windows and Macintosh computer game released in 1997 and published by Fox Interactive.  It allows players to explore the fictional town Springfield featured in the animated television series "The Simpsons", and the goal is to collect an entire set of character cards throughout the town.  The game was developed by Digital Evolution and features dialog by the cast members of the series.  Critics have given "Virtual Springfield" mixed reviews.  The plot and gameplay have been the target of criticism, while the game has been praised for its humor.

Supporting paragraphs: The Simpsons Lisa Simpson
Answer: Lisa