She is the leading soprano at the Paris Opera House who is criticised by the narrator and the Phantom for the lack of emotion in her performances.
Ashamed, she hides from the public view for a few weeks, before making a return to the opera house.
Carlotta is portrayed by Virginia Pearson in the original 1925 silent film with Lon Chaney.
In Andrew Lloyd Webber's 1986 musical production, Carlotta (last name Giudicelli) is from Italy and is one of the major singing parts.
Carlotta and tenor Ubaldo Piangi are lovers; she often turns to him for consolation when things go wrong, and she breaks down crying when his murdered body is discovered onstage.