Olaf is a major character in the musical adaptation of Frozen, based on the character of the same name.
Background[]
In the stage adaptation of Frozen, Olaf is brought to life by a puppet designed by veteran Michael Curry. He is first created during Anna and Elsa's song "A Little Bit of You", and is imbued with life sometime after Elsa's self-exile (he is not created during "Let It Go", as the song takes place after Olaf's introduction in the stage version).
While singing a reprise of "A Little Bit of You", Olaf encounters Anna and Kristoff by chance. Unlike the film, the enchanted Olaf retains his memories as he immediately recognizes Anna and reminds her of how she and Elsa created him when they were younger.
After an unsuccessful attempt to bring Elsa back to Arendelle, Olaf falls apart and sings a reprise of "Do You Want to Build a Snowman?" as Anna and Kristoff piece him back together. In the Denver workshop tryouts for the show, this scene had Olaf sing a vaudevillian number with Anna and Kristoff called "When Everything Falls Apart", in which an optimistic Olaf teaches Anna how to remain strong in times of trouble. However, this song was cut when the show made its way to Broadway.