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| Character | Actor/Muppeteer | Description |
|---|---|---|
| SAM the Robot | Jerry Nelson | A robot who is supposedly perfect, SAM is prone to silly mistakes. His name is an acronym for "Super Automated Machine". |
| Sherlock Hemlock | Jerry Nelson | Based on Basil Rathbone's movie portrayal of Sherlock Holmes, Sherlock is a detective who solves mysteries by "concentrating on the little clues and overlooking the big ones". |
| Sherry Netherland | Julianne Buescher (1993-1996), Alice Dinnean (1996-1998) | The "Leona Helmsley of the Furry Arms Hotel" where she is its owner. She rules with "an iron fist, a heart of gold, and a brain of oatmeal". Her name is a reference to the Sherry-Netherland Hotel in New York City. |
| Simon Soundman | Jerry Nelson | (1972) Fat Blue Anything Muppet that first appeared in season 2. He uses sounds in sentences. Example: "I would like to buy a "POUND! POUND! POUND!" (referring to a hammer). |
| Slimey the Worm | Jerry Nelson (1971–1978), Michael Earl Davis (1978–1980), Martin P. Robinson (1980–present), Dick Maitland (voice) | A worm who is the smallest and smartest character on Sesame Street. When he first appeared, he spoke in just squeaky sounds. He later became the only Muppet not voiced by a puppeteer. |
| Aloysius Snuffleupagus ("Snuffy") | Jerry Nelson (1971–1978), Michael Earl Davis (1978–1980), Martin P. Robinson (1980–), Bryant Young (rear end) | (1971–) Created to represent the psychological age of a four-year old, Snuffy at seven feet tall and twelve feet wide is the largest Muppet on Sesame Street. He was Big Bird's "imaginary friend" until 1985, when he was finally revealed to the adult cast. |
| Sonny Friendly | Richard Hunt (1986-1992), David Rudman (1992-2000) | The Pat Sajak of Sesame Street, whom he resembles, he is "America's Friendliest Game Show Host". His catch phrase is, "Are we having a nice day or what?" |
| Stuie Monster | Richard Hunt | (Episode 812) A maroon and yellow monster who appears in the song "Fur". |
| Sully | Richard Hunt (1973-1992), David Rudman (1992-) | One-half of the Muppet construction worker duo and Biff's silent counterpart. One of Richard Hunt's most "understated and complex" characters. |
| Stinky the Stinkweed | Joey Mazzarino | A talking stinkweed plant that lives in a smelly lot. Despite being a stinkweed plant he is actually very friendly and does not mind asking for a favor. |
| Super Grover | Frank Oz, Eric Jacobson | Grover's superhero alter ego who often more well-meaning than helpful. |
Read more about this topic: List Of Sesame Street Muppets