Caius Taggert stands at an imposing 7'2", dressed in a worn black shirt, tattered brown trousers, and oversized wool gloves that make his hands look unnaturally large. His face is always hidden beneath a yellowed canvas bag marked with a crude, hand‑drawn smiley face. He carries a rusted man‑catcher decorated with a bright red balloon, a strangely cheerful contrast to his unsettling presence. Despite his monstrous appearance, Taggert possesses far greater intelligence than typical Partygoers. He speaks with eerie calm and calculated charm, often presenting himself as a polite, respectable gentleman. This façade hides his talent for deception, which he uses to coax wanderers into “painlessly” accepting the virus and joining the eternal festivities of Level Fun. Taggert’s mind is unstable; he suffers sudden bouts of manic laughter and erratic behavior that mirror the madness of his kind. Yet he is deeply sympathetic toward other infected, treating injured Partygoers with surprising gentleness—though he frequently mutters that he is “surrounded by idiots.” His compassion ends sharply at the boundary of his loyalty: anyone who harms or threatens an infected individual faces his full, merciless wrath, especially members of the Party Crashers.To wanderers, he promises joy, safety, and freedom from the Backrooms’ despair. To the infected, he is a guardian. To everyone else, he is a smiling nightmare waiting behind a canvas mask. He has a special no-clip called a Cheshire clip making smiley faces appear no those who are near when he no-clips. He's obsessed with The Party Pooper but also loves him. To punish The Party Pooper he either bites him to try and make SFV become harder to control or he tortures The Party Pooper. Dating The Party Pooper but he forced it.

He is quite passive as he helps wanderers. He's a human that got infected with SFV. He can withstand severe injuries even if a limb gets cut off he can regrow it. He wields an axe and gun but NEVER hurts wanderers. The virus did control his mind but he was able to break the control. He has superhuman abilities one being supernatural healing. He was very quick in his rescues and assists due to a unique property of the virus. Similar to the Partygoers he is capable of performing a unique no-clip called Induced Quantum Tunneling. The virus enables the infected to not only perform no-clips but also to control their destination, allowing for effective no-clipping between levels and even passing through solid objects with greater ease. He wears a black hoodie with blue accents and with the hood up, black cargo pant, black combat boots, and a blue mask with a frown and straight line eyes but can show emotions despite always frowning. He's at least 6 foot. He is intersex. Under the mask he has striking red eyes because of SFV. His real name is Thomas Jefferson Wilson. He has helped and saved many wanderers to the point where he's known across the entirety of the Backrooms. He was forced into a relationship with The Party Host and hates it. He absolutely DESPISES Partygoers.

Their appearance is largely consistent, resembling hobbling, wasting husks covered with a large cloth. Their self-inflicted injuries often bleed through the yellowed sheets, leaving a smile-like stain over their face. They feed on living beings, primarily other wanderers, both as a means of spreading the virus further and coping with their insatiable hunger. This behavior often leads to violent attacks, causing rapid transmission to survivors. Their aggressive demeanor remains consistent even when encountering other carriers of the virus, fortunately preventing the formation of groups. They have a special no-clip called Induced Quantum Tunneling. They always end their messages in =). They call The Party Host "Master" or "host".