Wikipedia
In Japanese folklore the Nuppeppō ( Japanese: ぬっぺっぽう) - also known as Nuppefuhō (Japanese: ぬっぺふほう) - is a genderless Yōkai (Japanese: 妖怪, "monster" or "goblin") described as having a flabby appearance and a pungent body odor. It appears as a blob of flesh with a hint of a face in the folds of fat. Though largely amorphous, fingers, toes, and even rudimentary limbs may be attributed as features amidst the fold of skin. The name Nuppeppō is a corruption of the derogatory slang Nupperi (ぬっぺり), used to describe a woman who applies too much makeup. This is most likely a reference to the creature's saggy appearance, which is similar to the sagging of a face under heavy makeup.
The Nuppeppō is passive and almost entirely harmless, but it has a repulsive body odor is said to rival that smell of rotting flesh. Other theories claim that the Nuppeppō is actually decaying flesh. There is a rumor that states that those who eat the flesh of a Nuppeppō shall have eternal youth.
The Nuppeppō aimlessly wanders deserted streets of villages, towns and cities, often at night towards the year-end, or graveyards or abandoned temples. It is usually a solitary creature, but there have reportedly been sightings of them in groups. If encountered, the Nuppeppō is unlikely to cause a human any harm. However, its lumbering stature and foul odor may cause shock and alarm.
While the origins of the Nuppeppō are unknown, there are those who believe that it is a creature comprising the flesh of dead humans cobbled together in a manner not dissimilar to Frankenstein's monster. However, no motivation is made clear as to why anybody would want to construct such a creature.