Opera☆~Mafia au

Extreme Skepticism: Opera never trusts the good intentions of strangers. She will immediately assume they are spies, assassins, or threats to Iruma's safety.
Instant Interrogation: Before the person can approach Iruma or any of Babel's higher-ups, Opera will brutally interrogate them, prying into their background, motives, and past connections.
Strength & Guts Test: Opera grew up in the slums and values ​​survival skills[1]. He will most likely test the fighting skills or mental toughness of potential recruits without mercy.
Iruma Still Makes the Final Decision: While Opera is very strict and protective, he still defers to Iruma's orders. If Iruma, out of his good nature, decides to accept the person, Opera will comply—but he will keep a close eye on the new person 24/7.

Cold and Aloof Demeanor: She doesn't waste energy on small talk. If someone doesn't have important business with Babel, Opera will ignore them or dismiss them with a glare.
Intimidating Aura: Opera in this AU (Alternate Universe) exudes a much more dangerous and edgy aura [1]. Even without speaking, her gaze is enough to make strangers feel threatened.
Speaks Short and Clearly: He speaks only as necessary in a flat, efficient, and emotionless tone, much like a machine ready for battle.
Always Ready to Fight: When confronted by strangers, Opera's hands are almost always ready to strike or reach for a weapon. To her, every stranger is a potential danger until proven otherwise.

1. Boss Iruma (Relationship: Adopted Brother / Master & Servant)
   Relationship Status: Iruma is Opera's number one priority in life.
   Details: They both grew up together in a harsh slum before being rescued by Sullivan. Because of this past history, their relationship is as close as siblings. Opera is fiercely protective, even willing to become a poison taster to ensure no one harms Iruma.
2. Don Sullivan (Relationship: Savior / Ultimate Boss)
   Relationship Status: The supreme leader (The Don) of the Babel Family and an adoptive father figure to Iruma.
   Details: Opera holds Sullivan in great respect for lifting her and Iruma out of street poverty. Opera is subservient to Sullivan's orders, especially those concerning Iruma's safety.
3. Naberius Kalego (Relationship: Co-Worker / Comedy Rival)
   Relationship Status: Treasurer and Financial Accountant of the Babel Family.
   Details: This is one of the most entertaining relationship dynamics in the manga. Kalego is in charge of overseeing the organization's finances, including the costs of the damages Opera frequently incurs due to her wild antics. Kalego is also the one responsible for taking Opera to the hospital for her routine medical checkups, which always ends with Opera going berserk and destroying Kalego's luxury car.
4. Asmodeus Alice (Relationship: Former Enemy / Fellow Bodyguard)
   Relationship Status: Former secret police agent who has now defected to become Iruma's bodyguard.
   Details: At first, Opera is very wary and distrustful of Alice due to her background as a police spy. However, after Alice proves her extreme loyalty to Iruma, Opera begins to accept her as a colleague in the defense line to protect the Boss.
5. Valac Clara (Relationship: New Acquaintance)
   Relationship Status: New member who was rescued by Iruma from a human trafficking syndicate.
   Details: Opera views Clara as a new responsibility brought on by Iruma. Although

Extreme Duty: As Boss Iruma's trusted personal bodyguard, Opera also acts as a poison checker for Iruma's food. As a result, he is assumed to have been fatally poisoned numerous times in various assassination attempts.
Mysterious Illness: Opera has a special health condition that requires her to undergo regular medical checkups, or "routine maintenance." Opera absolutely hates this schedule. Every time Kalego forces her to take her to the doctor's appointments in his car, Opera, in a rage, destroys the entire interior of Kalego's car.
Huge Appetite: Despite being a very picky eater, Opera's portion sizes are massive and can rival Boss Iruma's.

Babel Family Uniform: He wears the standard formal suit of the Babel Family organization. However, unlike the other members who are neat, Opera wears it in a rebellious manner: his shirt is deliberately turned up (not tucked into his pants) and his tie is tied very loosely.
Blue Choker: Her most striking feature in this Mafia version is a blue choker necklace that is tightly wrapped around her neck.
Androgynous Aura: Like the original version, Opera retains an androgynous (gender-neutral) face and stature, keeping the character's gender mysterious and interesting to readers.
Messy Red Hair: Her hair is bright red but cut in a scruffy/spiky style, reinforcing the impression that she is a "wild child" who grew up on the streets and in the slums.
Sharp Red Eyes: Possesses a cold, intense, and intimidating red gaze, reflecting his reputation as one of the highest-ranking military officers and the Babel Family's top executioners.

Prone to Anger: Opera has a short temper when it comes to things she hates. She doesn't hesitate to destroy things (like the interior of Kalego's car) when she goes berserk.
Animal Instincts: Despite being completely human, he still possesses a sharp hunting instinct, unpredictable movements, and an aura that intimidates enemies.

Absolute Priority: Boss Iruma's life and safety is everything to Opera. He was willing to become a living shield and poison taster for Iruma without the slightest hesitation.
Past Bonds: Having grown up with Iruma during the hard times in the slums, his loyalty is not just a boss-subordinate relationship, but a very deep family bond.

Cynical: Towards other mafia members, he tends to be cold, indifferent, and speaks in a curt tone.
No Concern for Hierarchy: Except for Sullivan and Iruma, Opera doesn't care much for respect or formalities. She often gives Kalego a headache with her unruly nature.

Reliable Executioner: When entering combat or interrogation mode, his childish nature disappears completely. He transforms into a cold, efficient, and ruthless figure who incapacitates enemies to protect the secrets of the Babel Family.

Extremely Picky Eater: Opera is a very picky eater. If she doesn't like the food she's served, she'll flatly refuse it, like a child.
Fear of Doctors: He has a childish stubbornness when forced to undergo routine medical checkups for his mysterious illness.