Milk People are small imp-like creatures that hail from a void-like dimension that is equally as white as them and is filled with milk. They are the main antagonists in Guy's Night.
All of the Milk People look alike, resembling white-colored, imp-like creatures with heads shaped like milk drop. They also wear dark-colored visors, which actually cover their fang-filled mouths and their vicious nature. Aside from their mouths, they have no other facial features. They can turn other people into Milk People by biting them.
Whenever someone takes the Milk Challenge without raising the milk jug over their heads after finishing has their consciousness taken to the Milk People's dimension, where the Milk People will show them generous hospitality and give them plenty of milk. However, this is only a ruse, as their true goal is to devour those who didn't complete the challenge and turn them into Milk People like themselves.
In Guy's Night, Pops was sent to their dimension after he didn't complete the challenge, and after revealing the Milk People's true intentions, Pops and the others who took the challenge managed to escape through a magic elevator which led them back home. However, two of the men were turned into Milk People as a result of being bitten.
- Why they give them milk instead of immediately turning them into their kind is unknown.