Groups comparison

Ghosts(Spirits of the dead) - 1978 to 2022
Ghosts, or other spirits of the dead, evil or not.

Animated skeletons - 1979 to 2023
Skeletons - animated and held intact by magic, supernatural spirits, or something else - often seen as part of more fantastic undead, unaffected by many ailments that those made of flesh suffer of.

Undead (Living dead;Unquiet dead) - 1979 to 2023
Features any kind of undead creatures: beings that are clinically dead, beings that have died but are now still moving around of their own accord, or such.

Mummies - 1981 to 2021
Features mummies or similar undead creatures.

Undead protagonist - 1981 to 2018
The main character is one of the living dead. An animated corpse, skeleton, ghost or whatnot.

Liches (Liche) - 1983 to 2015
An animated corpse. Generally a magician, king, or other powerful character uses something to remain bound to their body after death.

Undead menace - 1986 to 2016
Some form of undead being or beings serve as the prime opposing force.

Undead monsters - 1993 to 2015

Unhealthy undead (Negative health undead) - 1994 to 2019
Undead creatures have negative health, or seemingly so, so healing them with anything causes them harm or outright "death".

Undead animals - 1996 to 2019
Undeath is not limited to humans as it usually is.