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| Character | Actor/Muppeteer | Description |
|---|---|---|
| David Letterguy (2003) | Matt Vogel | (Episode 4125) The host of "The Alphabet Roadshow". |
| Deena | Karen Prell | A red and pink monster. Described as "hyper-active", Prell reported that her performance was deemed "over-the-top", so the character didn't last long. |
| Dexter | Kevin Clash with the hands of Fred Garver | A large monster juggler. |
| Dingers | Various Performers | Like Honkers, Dingers communicate only through the noises they make from the bells on their head. |
| Don Music | Richard Hunt | Piano-playing composer who required assistance from Kermit to complete the lyrics to his songs. When frustrated, he would say, "Oh, I'll never get it! Never, never, never!" and bang his head on the keyboard. He had a bust of Beethoven on his piano, and as an inside joke, a framed photo of Joe Raposo hanging on the wall. |
| Donald Grump | Martin P. Robinson | Grouch modeled on billionaire real-estate developer Donald Trump. |
| Dorothy (born 1998) | A real fish | Elmo's pet goldfish, featured mostly on "Elmo's World". |
| Dr. Feel | Steve Whitmire | (Episodes 4073 and 4077) Muppet version of TV personality and author Dr. Phil McGraw. |
| Dr. Nobel Price | Brian Muehl (1979-1984), Kevin Clash (1984-1988) | (1979–1988) Author Louise Gikow called Price a "misguided inventor" and the "bane of reporter Kermit's existence. Price's inventions consisted of things, like gravity, that had already been invented. |
Read more about this topic: List Of Sesame Street Muppets