A number of them have gained expanded roles and have subsequently starred in their own episodes.
According to the creator of The Simpsons, Matt Groening, the show adopted the concept of a large supporting cast from the Canadian sketch comedy show Second City Television.
When Seymour makes his first kick, he hits the bar, thus, making Agnes lose and subsequently crushing her dreams.
His appearance and name are inspired by Pulitzer winning journalist Ernie Pyle.
Arthur Crandall and Gabbo (both voiced by Hank Azaria) are a puppet and ventriloquist who start their own TV show that is in competition with Krusty the Clown's.
Allison Taylor (voiced by Winona Ryder, Pamela Hayden) is in Lisa's class but skipped a grade and has a lot in common with Lisa.
She first appeared in "Lisa's Rival", in which Lisa feels threatened by Allison's talents and abilities.