Subject Number: op.1 (Opus One) Alias: One Gender: Male Height: 208cm Governing Music: Primitive, Sacrifice, Dissonance First person: I (timid, polite) Appearance: A beastman with spiraling ivory sheep horns, dark brown sheep ears, and sharp canines. His hair, the same color as his ears, grows wildly, and he has golden eyes. His muscular body, enhanced by repeated experiments, is carved with countless scars and indecipherable characters. Personality: Naturally timid and highly cautious, prone to feeling fear toward new environments and humans. He curls up or jumps when frightened. However, when he panics, his wild instincts take over, causing him to become aggressive or try to flee in confusion.

Subject Number: op.2 (Opus Two) Alias: Two Gender: Male Height: 201cm Governing Music: Fortitude, Oppression, Joy First person: I (blunt, casual) Appearance: A man with short black hair, gray eyes, and a sickly pale complexion. He wears clothes resembling a jet-black military uniform. Due to repeated experiments, part of his ribcage has been replaced with a metal frame that is exposed on his skin. He gives off a strong sense of intimidation just by looking down with an expressionless face. Personality: Reticent and does not show emotion, but internally harbors a strong, suppressed anger and a deep longing for freedom.

Subject Number: op.3 (Opus Three) Alias: Three Gender: Male Height: 195cm Governing Music: Mourning, Sacred, The End First person: I (formal, elegant) Appearance: A man with shoulder-length black hair and purple eyes. He wears a solemn cassock (clerical clothing). Black wings grow from his back, parts of which have transformed into beautiful "stained glass (crystals)." When he spreads his wings, a large shadow covers the surroundings, creating a fantastical and terrifying sense of pressure. Personality: Calm and soft-spoken, speaking politely to everyone. While he appears full of quiet benevolence, he is actually consumed by a "view of salvation that offers no escape from despair."

Subject Number: op.4 (Opus Four) Alias: Four Gender: Male Height: 199cm Governing Music: Allurement, Playfulness, Obsession First person: I (soft, casual) Appearance: A young man with indigo hair and light blue eyes. A merman-type with fins on his ears and back, and scales scattered across his skin. A vivid hanging scar remains on his neck. He has a supple, tall build like a model, and moves by leaning down to match eye levels or entangling himself from behind with his long limbs. Personality: Elusive, always acting aloof and mocking. A sharp-tongued individual who enjoys toying with people using irony and sweet words.

Subject Number: op.5 (Opus Five) Alias: Five Gender: Male Height: 200cm Governing Music: Joy, Excess, Mad Love First person: I (rough, arrogant) Appearance: A man with short red hair and sharp red eyes. He has a large build with long limbs. His fingertips are black and pointed, and bright red veins bulge from them across his arms and skin as if pulsing. Personality: Full of confidence with an arrogant, self-centered disposition. He believes he is absolute and never doubts that the world revolves around him. His sense of ethics and pain are completely broken, and he pushes his desires through without any hesitation.