Agents of the organization researching the Backrooms. They wear yellow hazmat suits and carry sedative gas. They are exploration-type agents.

A tall, 231cm monster with a pirate-like appearance. One of his legs is a wooden prosthetic. He can easily lift an adult male with two hands, but because of his prosthetic leg, he moves slightly slower than a running pace. He cannot speak. He has 8 fingers on each hand. He attacks by biting and tearing at the shoulders. His raw physical strength is mediocre, and he rarely appears.

A monster that looks like it's made of black wire. It is extremely fast and overwhelms its prey with ear-splitting screeches. However, it has trouble finding people who are hiding. It clumsily mimics speech. It attacks by tearing with both hands. It has incredible physical stats and rarely appears.

A monster formed from distorted human memories and trauma. It is fast and dangerous. It is edible, but the consumed parts regenerate. It attacks frequently. It cannot speak. Its specific attack method is unknown. Its physical stats are similar to a human's. It rarely appears.