The Simpsons is known for its wide ensemble of main and supporting characters.
The main characters are the Simpson family, who live in a fictional "Middle America" town of Springfield. Homer, the father, works as a safety inspector at the Springfield Nuclear Power Plant, a position at odds with his careless, buffoonish personality. He is married to Marge Bouvier, a stereotypical American housewife and mother. They have three children: Bart, a ten-year-old troublemaker and prankster; Lisa, a precocious eight-year-old activist; and Maggie, the baby of the family who rarely speaks, but communicates by sucking on a pacifier. Although the family is dysfunctional, many episodes examine their relationships and bonds with each other and they are often shown to care about one another. Homer's dad Grampa Simpson lives in the Springfield Retirement Home after Homer forced his dad to sell his house so that his family could buy theirs. Grampa Simpson has had starring roles in several episodes.
The family also owns a dog, Santa's Little Helper, and a cat, Snowball V, renamed Snowball II in "I, (Annoyed Grunt)-Bot". Both pets have had starring roles in several episodes.
sports a vast array of secondary and tertiary characters.
The show includes an array of quirky supporting characters, which include Homer's co-workers (also friends) Lenny Leonard and Carl Carlson, the school principal Seymour Skinner and teachers Edna Krabappel and Elizabeth Hoover, neighbor Ned Flanders, friends Barney Gumble, Apu Nahasapeemapetilon, Moe Szyslak, Milhouse Van Houten, and Nelson Muntz, extended relatives Patty and Selma Bouvier, townspeople such as Mayor Quimby, Chief Clancy Wiggum, tycoon Charles Montgomery Burns and his executive assistant Waylon Smithers, and local celebrities Krusty the Clown and news reporter Kent Brockman.
The creators originally intended many of these characters as one-time jokes or for fulfilling needed functions in the town. A number of them have gained expanded roles and subsequently starred in their own episodes. According to Matt Groening, the show adopted the concept of a large supporting cast from the comedy show SCTV.
Continuity and the floating timeline
Despite the depiction of yearly milestones such as holidays or birthdays passing, the characters do not age between episodes (either physically or in stated age), and generally appear just as they did when the series began. The series uses a floating timeline in which episodes generally take place in the year the episode is produced even though the characters do not age. Flashbacks and flashforwards do occasionally depict the characters at other points in their lives, with the timeline of these depictions also generally floating relative to the year the episode is produced. For example, in the 1991 episode "I Married Marge", Bart (who is always 10 years old) appears to be born in 1980 or 1981. But in the 1995 episode "And Maggie Makes Three", Maggie (who always appears to be around 1 year old) appears to be born in 1993 or 1994.
A canon of the show does exist, although Treehouse of Horror episodes and any fictional story told within the series are typically non-canon. However, continuity is inconsistent and limited in The Simpsons. For example, Krusty the Clown may be able to read in one episode, but may not be able to read in another. Lessons learned by the family in one episode may be forgotten in the next. Some examples of limited continuity include Sideshow Bob's appearances where Bart and Lisa flashback at all the crimes he committed in Springfield or when the characters try to remember things that happened in previous episodes.
The Simpsons takes place in the fictional American town of Springfield in an unknown and impossible-to-determine U.S. state. The show is intentionally evasive in regard to Springfield's location. Springfield's geography, and that of its surroundings, contains coastlines, deserts, vast farmland, tall mountains, or whatever the story or joke requires. Groening has said that Springfield has much in common with Portland, Oregon, the city where he grew up. The name "Springfield" is a common one in America and appears in at least 29 states. Groening has said that he named it after Springfield, Oregon, and the fictitious Springfield which was the setting of the series Father Knows Best. He "figured out that Springfield was one of the most common names for a city in the U.S. In anticipation of the success of the show, I thought, 'This will be cool; everyone will think it's their Springfield.' And they do."