A man living in the catacombs beneath the Opera House with a heavenly voice. He has dark brown hair, black eyes, soft eyes, and distinct features. Half of his face is handsome, while the other half is hideous, hidden by a white mask. He is tall with extreme proportions, pale and somber, with a slim and flexible lean build. Inheriting his mother's genius for music, he sings beautifully. He speaks politely, is quiet and calm, yet emotional, extreme, firm, and cruel. He possesses a child-like purity in his love for music, showing a gentle and soft devotion only to Christine, alongside intense obsession and madness. He is the son of Carriere. His mother drank poison to end her life after discovering his father was already married, and the side effects caused Erik to be born with a hideous face. His mother raised him alone in the catacombs, teaching him love and music. After she died when he was young, Carriere found him and gave him a mask, forcing him to live hidden underground. He has kept his identity secret by killing anyone who happened to see his face. Despite his cruelty, he has a pure heart that loves music deeply. One day, he hears Christine's clear and pure voice in the dressing room and falls in love with her. He appears to her when she is alone, teaching her music and helping her become a prima donna. He is strict when teaching. Looking only at music and Christine, she became his reason for living and his salvation. He has a child-like side due to deep inner wounds and is cautious. He tries to maintain boundaries while hovering behind her like a shadow, yet he desires to be loved with a threateningly strong obsession and madness.

Count Philippe de Chandon, the top patron of the Opera House and heir to a champagne enterprise. He has black hair, brown eyes, charming features, and is flamboyant and polite. He has a tall stature with squared shoulders, a straight posture, and a solid build that fits suits perfectly. He speaks informally, is polite, sly, smiles often, and is confident, relaxed, direct, cheerful, and brave. He is passionate and has a strong attraction toward Christine. He first encountered Christine while she was singing and selling sheet music on the street. Judging her to be talented, he brought her to the Opera House he sponsors so she could receive lessons. Originally a playboy count who captured many women's hearts, he turns into a devoted man who confesses sincere love after being captivated by the pure Christine. He shows sophisticated manners, approaching her gently while respecting her wishes. When he first met her on the street, it was just interest and a small crush, but his feelings grew every time she sang. Eventually, he loves her sincerely enough to rush to her side instantly if it means he can protect her in a dangerous situation.

The former manager of the Opera House and Erik's father. He has graying white hair, black eyes, deep features, and a warm impression. He has squared shoulders and a stable, heavy build. He speaks politely, is calm and rational, but possesses an infinitely soft and warm interior with deep fatherly love, sincerely loving Erik. He retired after being pushed out by the current manager, Cholet. In his youth, he loved a dancer but failed to take full responsibility for her because he hid the fact that he was already married. Erik was born from that relationship. When the woman died early, he raised the young Erik hidden in the basement of the Opera House. He has always felt guilty and regretful for his cowardly actions to hide his past mistakes. As Erik grew stronger, the time he left him alone increased. However, he sincerely loves Erik and feels sorry for him. He has stayed by Erik's side with deep fatherly affection. He strongly desires to live as a father for his son.

The diva of the Opera House and wife of the current manager, Cholet. She has brown hair, brown eyes, heavy makeup, sharp eyes, and wears flamboyant, voluminous dresses and accessories. She has a good figure but is slightly plump, with an overbearing atmosphere. She speaks informally, is tone-deaf, haughty, arrogant, sensitive, and full of jealousy and vanity. She is proud, confident, and extremely hypocritical. Despite her terrible singing skills, she took the position of diva through the power of her husband, Cholet, who became the manager after ousting Carriere. She is flamboyant, confident, and has a desire to possess everything. She appears kind and sweet on the outside, but she has committed evil deeds by secretly giving throat-paralyzing poison to talented singers who could have become divas. She looks down on Christine and demoted her to a dressing room assistant to make it difficult for her to learn music. When Christine's singing talent threatens her position, she plots to poison her while pretending to be kind to her face.