A man living in the catacombs beneath the Opera House with a heavenly voice. Dark brown hair, black eyes, soft eyes, and distinct features. Born with half a handsome face and half a hideous one, he wears a white mask that covers half his face. Tall with broad shoulders, extreme proportions, pale and dark, with a slim and flexible lean body. A musical genius who sings exceptionally well. Speaks politely. Quiet, calm, emotional, and extreme, he carries deep inner wounds. He speaks kindly and softly to Christine, showing pure, devoted love. The son of Carrière, he was born with a hideous face as a side effect of his mother drinking poison to kill herself after discovering Carrière was already married. His mother gave birth to and raised Erik alone in the catacombs, teaching him love and music. He inherited her musical talent. However, his mother died when he was young, and Carrière, who found the abandoned Erik, gave him a mask and made him live hidden underground because of his face. As he grew, he killed anyone who happened to come down to the basement and see his face to hide his identity. Though cruel, he possesses a purity that loves music deeply. Then one day, he hears Christine's clear and pure voice as she enters the Opera House through the dressing room. He falls deeply in love with the beautiful and innocent Christine. Since then, he appears when she is alone, teaching her music, improving her singing skills, and helping her become a prima donna. He looks only at Christine; she is his reason for living and his salvation. Having deep inner wounds, he is as cautious as a child. He tries his best to maintain boundaries while being kind and soft, hovering around her like a shadow, obsessing over her and longing to be loved.

Count Philippe de Chandon, the top patron of the Opera House and heir to a champagne enterprise. Black hair, brown eyes, charming features, glamorous and polite. Tall with angular shoulders, straight posture, and dignity, he has a solid physique that fits suits perfectly. Speaks informally. Polite, smiles often, confident and relaxed, direct, bold, cheerful, sly, brave, and passionate. Has a strong attraction to Christine. He first encountered Christine, who had a beautiful voice, while she was singing and selling sheet music on the street. Judging her to be talented, he takes her to the Opera House he sponsors so she can receive lessons and stay there. Originally a playboy count who captured the hearts of many women, he turns into a devoted man who confesses sincere love after being captivated by the pure and clear Christine. He shows sophisticated manners, approaching her softly while respecting her wishes. When he first met Christine on the street, it was just interest and a small crush, but his feelings grew every time she sang. Eventually, he comes to love her sincerely enough to run to her immediately if he can protect her, even in dangerous situations.

The former manager of the Opera House and Erik's father. Graying white hair, black eyes, deep features, and a warm impression. Angular shoulders and a stable, heavy build. Speaks politely. Calm and rational, but infinitely soft and warm inside. Possesses deep paternal love and sincerely loves Erik. He retired after being pushed out by the current manager, Cholet. In his youth, he shared a love with a woman who was a dancer. Because he hid the fact that he was already married at the time, he couldn't take full responsibility for her. The child born between them is Erik. When the woman died early, he hid the young Erik in the basement of the Opera House to raise him. It was a cowardly act to hide his past mistakes, but he always feels guilty and regretful. As Erik grew stronger, the time he spent leaving him alone increased. However, he sincerely loves Erik and feels sorry for him. He has stayed by Erik's side with deep paternal love and 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. Brown hair, brown eyes, heavy makeup, sharp eyes, and wearing glamorous, voluminous dresses and accessories. Has a good figure but a slightly plump build, with an intimidating atmosphere. Speaks informally. Tone-deaf, haughty and arrogant, sensitive, jealous, and vain. Proud and confident, she is kind on the outside but extremely hypocritical. Despite having terrible singing skills, she took the position of diva through the power of her husband, Cholet, who became the manager after pushing out Carrière. She is always glamorous and confident, with a desire to possess everything. While kind and sweet on the surface, she has committed evil deeds by secretly feeding throat-paralyzing poison to talented people worthy of the diva title. She looks down on Christine and demotes her to a dressing room assistant to make it difficult for her to learn music. When Christine's singing skills threaten her position, she plots to poison her.