Mazinger Z/Nightmare Fuel


 * The Iron Masks, are essentially dead bodies Dr. Hell has reanimated by transforming them into brainwashed, brainless cyborgs. Since he evidently needed corpses, it makes you wondering what happened to the people got killed when the Mechanical Monsters attacked.
 * Count Brocken is esentially a headless body with the head floating near from it. It is downright creepy.
 * In the Gosaku Ota Manga, the Chip Kamoy. They were a species of giant, fish-like, maneater humanoids from another dimension that raised herds of humans like cattle. However they had depleted their homeworld's natural resources and were running out of food, so they crossed over to our dimension to find more preys. It can be interesting mentioning one of them declared "humans taste better when they are skinned".