Dupuis is a celebrity in French-speaking areas of Canada and is also well known in anglophone areas due to his English-language and bilingual projects. He has performed in many theater productions, movies, and television series. Among the stage roles that he has performed so far are: Luc in Michel Marc Bouchard's "Les Muses orphelines" ("The Orphan Muses"), directed by André Brassard in 1985; Roméo in a Québécois adaptation of William Shakespeare's "Romeo and Juliet" ("Roméo et Juliette"), directed by Guillermo de Andrea in 1989; and Jay in Jean-Marc Dalpé's "Le Chien" ("The Dog"), Adrien in Jeanne-Mance Delisle's "Un Oiseau vivant dans la gueule" ("A Live Bird in Its Jaws"), and Lee in a Québécois version of Sam Shepard's "True West," all three productions directed by Brigitte Haentjens, in 1987-89, 1990, and 1994, respectively.