Momonjii

The Momonjii is one of two different transformations that extremely old Nobusuma may become in ancient Japanese folklore - as such it is an advanced form of yokai and is depicted as an extremely old, feral human with thick hair and monstrous traits betraying his ancient origins as a bat-spirit.

The Momonjii has lost most of his vampiric nature and no longer stalks travelers to steal their lantern fire, nor does he hunt down small animals to drink their blood - in fact what the Momonjii eats (if anything) is a mystery and he instead haunts lonely roads or out-of-the-way places.

If encountered the Momonjii will cause people to grow very sick and while not a lethal yokai he has no qualms about beating any he comes across, especially misbehaving children or even children who simply cry (making him a form of bogeyman).

While a rather unpleasant yokai he is not nearly as dangerous as the other forms of the Nobusuma though his ability to cause sickness does make contact with him hazardous to mortals.