: They are animated by a rusty "robotic core" and secrete a highly corrosive, flammable slime used to burn through materials.

: Enormous, robotic-like worms that can grow up to 30 feet long within the walls of various levels.

: They hunt in packs and are extremely hostile. They pin down conscious victims to extract their teeth and gums to replace their own.

: One of the most iconic entities, appearing as glowing white eyes and a wide, sharp-toothed grin in dark areas.

: Aggressive, dog-like creatures with human faces and long black hair. EVERY Backrooms Entity EVER!

: They leave a trail of slimy mucus that, upon contact, infects humans with a fatal oral disease that eventually transforms the victim's skin into tooth-sprouting gum tissue.

: Resembles a massive centipede constructed from human body parts.