Disco Stu, real name Stuart Discotheque (voiced by Hank Azaria) is a man who is mentally stuck in the disco era. He is normally featured wearing a rhinestone-encrusted leisure suit. Stu was introduced as the punchline to a joke in "Two Bad Neighbors". In a garage sale, Homer attempts to sell a jacket on which he had once tried to write "Disco Stud" in rhinestones, but having made the letters too big he did not have room for the final "d". After Marge remarks that nobody would ever want to buy a jacket that read "Disco Stu", another customer recommends it to Stu, but Stu replies, "Disco Stu doesn't advertise." Stu's speech pattern is similar to that of Duffman, also voiced by Hank Azaria; he speaks in the third person, often referring to himself as "Disco Stu" (emphasizing "Stu" and then pausing before saying anything else; whatever follows usually rhymes with "Stu"). According to "How I Spent My Strummer Vacation", Stu actually is aware disco is dead, does not like disco music at all, and worries that his personality may make him a "one-note guy". He is a Roman Catholic, having gotten an annulment from Pope John Paul II after a brief marriage to Selma Bouvier. In the March 11th, 2012 episode "How I Wet Your Mother", Professor Frink created a device that allowed people to enter the dreams of others. He stated he had already used the device "To cure another Springfielder of his particular obsession" at which point Stu walked into the frame in khakis and a collared shirt saying "Normal Stu likes normal things." It is yet to be seen whether this transformation is permanent.
Show runner Bill Oakley described the original Disco Stu as "a black, wrinkly John Travolta". Stu was originally to be voiced by repeat guest star Phil Hartman. However, when the animators remodeled the character, Hartman was not available to dub the voice and so Hank Azaria took over the role. Out of 25, IGN named Stu the 24th top peripheral character in The Simpsons.
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