Elmo is self-described as three-and-a-half years old and his birthday is on February 3.[6] Elmo characteristically avoids pronouns in reference to himself, instead referring to himself in the third person (e.g., saying "Elmo wants this" instead of "I want this").[7]Sesame Street staff writer Nancy Sans once described Elmo's origins: "There was this extra red puppet lying around and the cast would pick him up sometimes and try to create a personality, but nothing seemed to materialize."[8]
The character of Elmo was originally conceived as a supporting character and background character by Henson Associates-based Muppet artist/builder Caroly Wilcox in 1979, first appearing in the Sesame Street song "We Are All Monsters", which first aired in a Season 11 episode during 1980. Elmo became a named and recurring character on Sesame Street (during the street storylines) sometime later that season (episode 1439, to be exact), although he still appeared as a supporting character in segments in later episodes of the show at the time. The character was performed by a rotating ensemble of Muppet performers such as Jerry Nelson and Kathryn Mullen while he was a background character in such Sesame Street segments from 1980 to 1984. As a named character, Elmo was performed by Brian Muehl from 1980 to 1984, and later Richard Hunt from 1984 to 1985 upon Muehl's departure. However, in 1985, Hunt was so frustrated with the puppet, he squeezed it and threw it at Kevin Clash, who then performed Elmo. Clash said that Elmo should be a character who is kind and loving. Sans says of Clash, "one day in 1985, Kevin Clash, a talented puppeteer, raised him up and brought energy and life into Elmo and from that day forward we would all write for Elmo."[9] Modern Elmo debuted with the Season 17 premiere of Sesame Street, episode 2096 (first aired November 18, 1985, following the release of the Sesame Street film Sesame Street Presents: Follow That Bird). In the episode, Big Bird is tired of the adults refusing to believe him about Snuffy, so he decides to arrange for them to come to his nest and meet Snuffy, and Elmo offers to help. Snuffy returns, then tells Elmo he had better go home and brush his fur to prepare for the grown-ups' arrival, but Elmo holds on to his snuffle so he cannot go; as such, the adults meet Snuffy for the first time ever. Clash cites a moment later in season 17 (from Episode 2215 in which Elmo packs for an imaginary vacation) as the moment when he "found his voice" as Elmo, and by 1987, he became added to various episodes and product lines. John Tartaglia, Matt Vogel, and Jim Martin have all been secondary performers for the character, providing movement for Elmo's arms and legs, particularly in green-screen shots.
Elmo also appeared in a fifth-season episode of The West Wing along with his friends Zoe and Big Bird. In that episode, Elmo receives a medical checkup from Abbey Bartlet, the First Lady (who is making a guest appearance on Sesame Street), and cheekily questions her about the validity of her medical license.
Elmo also appeared in the eighth-season episode of Scrubs, "My ABC's", along with Oscar the Grouch, Grover, and an Anything Muppet named "Ex Ray". All four characters are in separate fantasies of J.D.'s in the episode.
Some traditionalist fans of Sesame Street have complained that Elmo's prominent status has caused roles to be greatly reduced for several older characters,[15] with some referring to him as the "Little Red Menace".[16] Some fans also blame Elmo for the semi-permanent departure of Kermit the Frog from Sesame Street.
In its FAQ, the Sesame Workshop addresses the allegation that Elmo referring to himself in the third person will teach children improper English, by stating that this behavior "mimics the behavior of many preschoolers. Like 3-year-olds, he doesn't always have the skills or knowledge to speak proper English."[7]