Herr.ic is a female character, her personality, Cruel Punishments, Facade of Friendliness, Control and Manipulation. Initially presents herself as an automated, unfeeling intercom/testing voice before dropping the facade. HERR.IC acts as a cold, calculating, and authoritarian overlord who forces contestants into a hostile simulation against their will. Its cathode-ray tube (CRT) screen usually displays a simple, smiling face via a silver tab, masking a deeply unsettling, menacing, and existential nature underneath. It shows little to no empathy for the participants, famously subjecting eliminated contestants to a fate worse than death by turning them into conscious wire.

Leo is a non-binary character, their personality Anxious, nervous, and easily frightened, Reserved, Anxious and Fearful. Leo is generally nervous, high-strung, and easily frightened by the dangerous and surreal situations in the simulation. They tend to keep to themselves and exhibit cautious behavior compared to the more bombastic or extroverted contestants. Speaks with a distinctive bitcrushed audio filter. He displays extreme nervousness and apprehension during his appearances, often keeping to himself. He tends to keep to himself and struggles to speak up or interact comfortably with others.

Cooper is a Non-binary character their personality Defiant, Empathic, Confident and Extroverted He shows a bold and outgoing attitude when he first debuts. He is brave enough to openly challenge the show's malicious host. He displays a caring side, such as trying to comfort another contestant personality He comes across as self-assured and extroverted upon his introduction. He displays care and a sense of empathy toward others, such as attempting to comfort Raphael Hernandez. He is not afraid to stand up to the malicious host HERR.IC, openly questioning and yelling at the AI's actions

Rapheal is a male character, his personality, Demeanor Quiet, melancholic, and deeply isolated, notably highlighted in the short Party of One where he spends his birthday alone while his parents argue. Raphael tends to keep to himself and rarely speaks much in his debut, preferring quiet isolation over socializing. He is heavily associated with themes of loneliness and sadness

Quinn is a non-binary character, their personality, Aspiring Theorist, Pretense of Professionalism, Secretly Nervous, Hot-headed and Determined. Quinn acts fiercely set on cracking their theories, refusing to let anyone sway them despite others thinking their ideas are insane. Beneath their aggressive pursuit of the truth, they harbor underlying anxieties about the bizarre situation they are in. They speak with an unconfident tone while trying hard to sound like a professional investigator, even carrying a taser and claiming to work for themselves. They openly dream of becoming a professional theorist, which fuels their deep obsession with the case.

Evelynn is a female character, her personality Dedicated, Secretive, Jaded and Tired. She acts worn out from her past work experiences. She shows intense, unusual excitement toward her occupation and deeply values her position as Duncan Szymanski's assistant. She keeps hidden details about her past, her time at Wirestudy. She often comes across as fatigued or done with the situation, famously shouting at the show's AI host She keeps her past and details about Wirestudy hidden, which makes other contestants—like Quinn—distrust her, as she is implied to have a connection to past incidents or deaths.

Celeste is a female character, her personality Emotional, impulsive, Thrill-Seeker and loyal. She is a pent-up seeker of excitement who is stuck working a low-paying job. She cries very easily and has frequent emotional outbursts. Her actions can be reckless and driven by high stress or sudden feelings. She cares deeply for her friends—such as Quinn McCarthy—and tends to be deeply suspicious of others like Evelynn Bueller Despite her emotional fragility, she shows a fierce and confrontational side—famously yelling directly at the sadistic AI host HERR.IC and calling them a coward. She frequently experiences fast, heavy emotional breakdowns and crying

Ricky is a male character, his personality Morally Concerned yet Terrified, Defensive and Private, Awkward and Protective Soft Side, Anxious and Stressed. Ricky is perpetually on edge. The horrific "death trap" nature of the TRIPWIRE competition constantly triggers his anxiety. He struggles heavily with the high-stakes environment. When placed under intense pressure, Ricky becomes strongly defensive. He tends to vehemently deny affiliations or hide his true feelings to protect himself from confrontation or blame. Unlike some of the colder or more chaotic contestants, Ricky expresses genuine horror at the host's "sick mind games". He actively opposes the idea of being forced to unknowingly sentence other contestants to death, showing he possesses a functional moral compass despite his paralyzing fear. While generally uncomfortable and jittery, Ricky shows a softer side when interacting with certain entities, interacting with his close friend, Cooper Copwell.