IGN's list of the Top 25 Peripheral characters

In 2006, the internet site IGN.com published their list of the Top 25 Peripheral Simpsons characters.

Definition
According to the article, "There are many, many small "peripheral" roles on The Simpsons, but how did IGN TV determine the best peripheral characters? Well, first we eliminated characters that are shown often enough to be considered "regulars" (like Moe, Milhouse, Mr. Burns, and Smithers) or big supporting characters that have often gotten their own storylines (like Krusty, Apu and Principal Skinner). After all the bigger characters were removed, we narrowed down our list to the 25 characters we like the best. Limiting the number to 25 meant that some of the characters we wanted to make the list didn't, such as Kang & Kodos, Gil, and Dr. Hibbert -- so maybe there's another character list in our future."

The list

 * 1) Troy McClure
 * 2) Sideshow Bob
 * 3) Ralph Wiggum
 * 4) Groundskeeper Willie
 * 5) Barney Gumble
 * 6) Lenny Leonard & Carl Carlson
 * 7) Cletus Spuckler
 * 8) Comic Book Guy
 * 9) Otto Mann
 * 10) Itchy & Scratchy
 * 11) Patty and Selma Bouvier
 * 12) Captain Horatio McCallister
 * 13) Joe Quimby
 * 14) Professor Frink
 * 15) Lionel Hutz
 * 16) Edna Krabappel
 * 17) Frank Grimes
 * 18) Fat Tony
 * 19) Snake Jailbird
 * 20) Hans Moleman
 * 21) Duffman
 * 22) Mr. Teeny
 * 23) Dr. Nick Riviera
 * 24) Disco Stu
 * 25) Bumblebee Man