Deathman

Deathmen (妖死族) are a race of Undead Majin. Their bodies are composed of the power and flesh of thousands of corpses created through the forbidden magic Birthday (妖死冥産) and are Demon Lord-level monsters.

Appearance
Deathmen, as high-level beings, possess an appearance based on their own self-image. This results in an appearance that is identical to that of the individual's previous life or otherwise desired form. They usually possess a more monstrous second form influenced by their body's essence as an Undead, resulting in a strange zombie-like appearance.

Trivia

 * Kagali was the first known Deathman in the series chronologically, created by Jahil's "Birthday" spell.
 * They are different from most Undead, in that they possess full flesh and are equipped with biological functions, the extent of which is still yet to be known.
 * While Deathmen are able to live with just their Astral Bodies and connect their consciousness to the leylines, it is also a curse as in some cases they cannot possess the host if they already have an existing Soul, such as the situation with Kagali, who was forced to share a body with Yuuki Kagurazaka till she was given a Homunculus body that was not contaminated by any Souls.
 * Compared to other Majin, their race seems to be the lowest population-wise. It is possible that Deathmen cannot reproduce at all, given that they can only be created through the "Birthday" spell and that their essence itself is that of an Undead.
 * Given Kleiman's transformation into the "Crazy Pierrot" form, it is possible that Laplace and the other members of the Moderate Harlequin Alliance also have such an ability. However, this seems unlikely as the form is more combat oriented and given Kleiman's weak power, it is possible it was given to him for self-defense and offense solely, and that the other members already possess powerful combat capabilities.