- "Sorta like a shaved gorilla, except with horns, a big head, lots of teeth, and harder to kill. Don't get too close or they'll rip your fraggin' head off."
- ―Doom instruction manual
The Demon (also well known as a Pinky Demon or just Pinky) is a relatively muscular, human sized monster found within the DOOM Universe. Demons are of a pinkish hue and have yellow eyes, one downward-curved horn on both sides of their head, a jutting spine, sharp, bloody teeth, humanoid hands, and elephant-like feet. They walk with a long swing in their arms and move rather quickly. The fact that one variant is known as a "bull demon" may indicate that the "pinkies" are, in fact, females though this is simple speculation. It could also indicate that pinkies could be immature or castrated (or some other form of removing sexual capability).
Demons do not have a ranged attack but rely on their fast speed to quickly close in on an enemy with a vicious melee attack. The Demons move in a zig-zag pattern, making it harder to take a clear shot at them. Fortunately, Demons are rather oblivious and tend to roam aimlessly for quite a while before actually attacking.
There is an invisible counterpart of the Demon known as a Spectre. They are exactly the same as Demons except they lack an easily visible physical form, giving them the same effect as partial invisibility spheres have on its users. They appear as slightly shimmering beings and are harder to see in darker spaces or along grey walls but are easier to notice in lighted areas.