Maha Sona
In folk tradition in Sri Lanka, Maha Sona was a warrior named Ritigala Jayasena who was revived after death with a bear's head fitted backwards.
Wikipedia says that in local folk traditions Maha Sona was once a human, Ritigala Jayasena, a fierce warrior in the reign of King Dutugamunu. He offended the giant Gotaimbara, one of the king's Ten Giant Warriors, while drunk, and agreed to a bare-handed duel. In some versions Gotaimbara cuts off his head by accident, in others with a single kick, and the body is thrown into an open graveyard. A deity takes pity and tries to revive him before the body cools, or before another time limit passes. The head cannot be found, so the deity fits a bear's head instead. In the rush it goes on backwards.
Wikipedia's article on the demons of Sri Lanka describes the exorcism rituals held to drive off demons when a person is thought to be affected. Known as the Sanni Yakuma, they are linked to the Pahatharata dancing form. They are long and elaborate, with dancers dressed as demons and drums. Offerings are made to the demon, which agrees to leave in exchange.
"In local folk traditions, Maha Sona was formerly a human known as Ritigala Jayasena (Jayasena of Ritigala), a fierce warrior who lived during the reign of King Dutugamunu. After offending the giant Gotaimbara (one of the Ten Giant Warriors of King Dutugamunu) in a drunken stupor, he agreed to a bare-handed duel. Depending on the version of the tale, Gotaimbara decapitates Jayasena either accidentally or with a single kick, after which the cadaver is tossed into an open graveyard. Upon seeing Jayasena’s predicament, a deity takes pity on him and attempts to revive him before the cadaver grows cold (or another time limit is reached). With time of the essence and unable to find his head, the deity attaches a bear’s head in its place before reviving him. Due to the urgency, the head is fitted backwards."
- Demons of Sri Lanka, Wikipedia