Mbwiri

Mbwiri are a parasitic demon from African folklore used as a means to explain certain medical conditions, while the idea of possessing demons is near-universal and found in innumerable media the Mbwiri themselves are a fairly unique creature found mostly in their native folklore.

History
A Mbwiri is a possessing demon from Central African folklore that causes victims to undergo epileptic fits as well as force them to dance wildly and even drive them insane. It was believed that only the local shaman knew how to drive the spirit out and thus, when a Mbwiri possession was suspected, locals would call on the shaman's aid. The practice of removing the spirit involved the shaman building a special hut in which he and the afflicted to would reside and be treated to great feasts. The spirit was said to despise good living and thus would often flee the victim.