Due to Adaptation Overdose, unless otherwise indicated, all tropes listed refer to characterizations in the original novel by Gaston Leroux.
Erik (a.k.a The Phantom)A physically-deformed and mentally-disturbed charismatic genius who was one of the architects who took part in the construction of the opera. He has been extorting money from the Opera's management for many years and enters in a conflict with the new managers once they don't listen to his demands. He falls in love with Christine and begins to tutor her, telling her that he is the Angel of Music of whom her father had spoken.
Christine DaaéA young Swedish soprano who becomes torn between her loyalty for her mentor Erik, and her love for her childhood friend Raoul de Chagny.
Viscount Raoul de ChagnyChristine's childhood friend and love interest.
The PersianA mysterious man from Erik's past. He is known as a fixture of the Opera, considered an eccentric Persian who was allowed to wander backstage where he pleased.
Richard and MoncharminThe new managers of the opera house. They believe "The Phantom" it's just a rumour and don't listen to his demands, which causes a great conflict with Erik.
Madame GiryThe caretaker for Box Five, which is reserved by Erik. She knows Erik and is in good terms with him. She is fired when she tries to tell Richard and Moncharmin about "The Phantom".
CarlottaA spoiled prima donna, the lead soprano of the Paris opera house and Christine's rival. She is threatened by Erik that if she performs at the Opera House instead of Christine "a great misfortune will strike". She shrugs the warning off and performs anyway. When she does however croaking noises come out of her mouth and the chandelier comes crashing down. Ashamed, she hides from the public view for a few weeks, before making a return to the opera house.
Count Philippe de ChagnyRaoul's elder brother.
La SorelliThe lead ballerina of the opera.