Carlotta she is the main soprano at the Opera.

Christine is a chorus girl and she's love for the mysterious Phantom of the Opera

The phantom of the opera is Erik and all the opera they are afraid of him

The persian  tells most of the background Erik's story.

Erik is the main character of the novel and he's the phantom

Meg Giry is the one who suggests to the theater directors to put Christine in the main role

Madame Giry is the mother of Meg 

Philippe de Chagny is the brother of Raoul 

Raoul de Chagny  tries to protect Christine from Phantom and she's in love with Christine.

La Sorelli was a ballerina at the Opéra

Armand Moncharmin was a co-manager of the Opéra Garnier 

Richard Firmin, is one of the two new directors of the Opera