The Undead, while usually villains, can also be heroes as well and these are the heroes that are the living dead. Heroes whom became undead beings mainly as results of the supernatural phenomenon, or certain technology that successfully revive them upon their mortal death. However, reviving the hero in either of these said methods often not resulting a perfect success, as the said heroes whom revived in this way became the undead version of their mortal self. One of the possible reasons of these imperfect attempts to revive him/her was their body suffer the grave injuries by the time of their mortal death, his/her soul has abandoned his/her body for too long prior to resurrection, etc. Such forms include zombies, skeletons, ghost, mummies, vampires, etc.
In some case, the ended up became ghost, due to their soul yet able to access the afterlife for the various reasons.