Queen Elsa is the main deuteragonist in the musical adaption of Frozen, based on the character of the same name.
Background
In the musical, her role slightly more developed than the animated counterpart. The musical puts more emphasis on the internal and external struggles that come with Elsa's powers. The show is also more blatant and direct with the darker themes that make up Elsa's arc, some of which were only hinted at in the animated film.
While visiting the hidden folk during the first act of the show, Elsa begs Pabbie to remove her powers, though he explains that he cannot as her powers are part of her. This leads Elsa to agree with her father that she and Anna be separated, even going as far as to counsel her hesitant mother about the decision. Despite Agnarr and Iduna's deaths early on, Elsa would occasionally look to them for guidance throughout the show.
Elsa takes part in several numbers, though two new solos were written specifically for the Snow Queen as spiritual companion pieces (and antithesis) for "Let It Go" - the first being "Dangerous to Dream", in which Elsa mourns the loss of her freedom and happiness at the expense of her powers. During "Monster", Elsa laments the tragedy that her powers have brought upon the world, and desperately looks for a way to end her troubles as Hans and his men seize the Ice Palace.