I've noticed that all three of the Largo kids had a personality disorder

Luigi Largo has Anti-Social Personality Disorder

failure to conform to social norms with respect to lawful behaviors as indicated by repeatedly performing acts that are grounds for arrest (Despite when his father gets on to him about what he has done wrong, Luigi still continues to throw temper tantrums and stab people)

deception, as indicated by repeatedly lying, use of aliases, or conning others for personal profit or pleasure (during the opera scene, Luigi tries extremely hard to convince Shiloh that her father is a "monster")

impulsivity or failure to plan ahead (Luigi appears to have many impulses such as an impulse to stab people with angered and rip off his shirt when talking about inheriting Geneco)

irritability and aggressiveness, as indicated by repeated physical fights or assaults (Luigi is infamous for being the violent and tough Largo sibling as he's not afraid to bully and lash out on Pavi and Amber or kill someone who's angered him)

reckless disregard for safety of self or others; (Doesn't seem to care when someone is hurt. In fact fact he seems to enjoy it as seen in "Night Surgeon")

consistent irresponsibility, as indicated by repeated failure to sustain consistent work behavior or honor financial obligations; (Despite being a significant figure to Geneco, he doesn't care if he has raging meltdowns and he's a psychopathic killer)

lack of remorse, as indicated by being indifferent to or rationalizing having hurt, mistreated, or stolen from another (Luigi just simply doesn't care about any one's feelings but own. He's willing to stab another person simply because they gave him the wrong coffee and he shows no remorse or anxiety when stealing another man's popcorn)

Pavi Largo has Narcissistic Personality Disorder

Expects to be recognized as superior and special, without superior accomplishments (Pavi simply thinks he's special simply because the many faces he wears are beautiful and boasts on how everyone loves him)

Expects constant attention, admiration and positive reinforcement from others (Pavi is mostly seen around genterns because they give him constant praise and nearly worship him)

believes others envy him/her (Pavi seems to think that Luigi wants to be him because he's always teasing Luigi on how everyone prefers the Pavi)

Is preoccupied with thoughts and fantasies of great success, enormous attractiveness, (Pavi has fantasies of owning Geneco and Pavi tries to be enormously attractive by stealing and wearing women's faces)

Lacks the ability to empathize with the feelings or desires of others (Pavi doesn't appears to be affected when his brother Luigi stabs one of the Genterns)

Is arrogant in attitudes and behavior (Pavi is very boastful about him self and his achievements in "Mark it Up" and when arguing with his siblings during the fair scene)

Has expectations of special treatment that are unrealistic (Pavi expects to get laid or get blow jobs by the genterns at any time he wants)

Amber Sweet has Histrionic Personality Disorder

Exhibitionist behavior (Amber dresses very revealing when she's with Grave Robber)

Constant seeking of reassurance or approval (Amber will throw a bratty fit when she doesn't get her way)

Excessive sensitivity to criticism or disapproval (Amber whines and complains to her father when he disapproves of another surgery)

Inappropriately seductive appearance or behavior of a sexual nature (The way she is dressed in "Zydrate Anatomy" is a perfect example and she is very promiscuous with Nathan during the "Who Ordered Pizza" scene)

Using somatic symptoms (of physical illness) to garner attention (Amber uses her failed facial surgery as a ploy to get her father's attention)

A need to be the center of attention (Amber is very pretentious in "Mark it Up" when she simply asks where father is at" and she appears to love to be on stage)

Low tolerance for frustration or delayed gratification (Amber is unafraid to punch her ill-tempered brother Luigi in the genitals all because he didn't tell her where their was located at)

Rapidly shifting emotional states that may appear superficial or exaggerated to others (Amber appears to be fake crying when complaining to her father)

Making rash decisions (Amber will go to a street Zydrate meeting rather than appear as the head of the Zydrate support network on live TV and her constant surgeries)

Blaming personal failures or disappointments on others (Amber blames Blind Mag for the reason why she's the voice of Geneco and not her and blames her father for the failed surgery)