Undead

A being that isn't fully dead but certainly not alive either. It exists between the states of life and death, typically after a living creature has passed away and had some remnant of its being continue in something of a second life. The undead are a common sight in the fantasy and horror genres and Halloween Specials, but they aren't restrained to those two mediums. Many beings can be considered undead, and the list below describes some of them.

Ghost
A ghost is the detached soul of a once-living being. They lack a corporeal form and are able to phase through physical matter. Further taking advantage of their non-physical bodies, ghosts have the unique ability to haunt objects by placing themselves in those objects and control their movements. If a living creature is haunted, it is instead referred to as possession. A possessed being is unable to control itself as the ghost within now owns its body. Ghosts differ in appearance, from resembling their former bodies to being legless blanket sheets with wide, black eyes.

Skeleton
The free-moving bones of beings who have passed, skeletons are a popular breed of undead along with ghosts and zombies. Although they don't own any unique abilities of their own, they are sometimes depicted with a resistance to fire. These aren't easy to draw.

Zombie
Among the most basic and well-known undead is the zombie. This is a rotting corpse capable of walking around on its own after a person's death. Undead bodies of animals also exist, but they're less seen than those who came from human or humanoid bodies. Zombies are usually described as slow-walking and stupid creatures, which might be why they hunt human brains to feast on. A Zombie Apocalypse is a catastrophic event in which zombies have taken over (a part of) society and are a widespread threat to the living. If someone is bitten by a zombie, they will likely turn into one themselves.