Ikiryō

      In Japanese folklore, not only the dead are able to manifest their reikon for a haunting.

     Living creatures possessed by extraordinary jealousy or rage can release their spirit as an ikiryō, a living ghost that can enact its will while still alive.
   
       The most famous example of an ikiryo is Rokujo no Miyasundokoro, from the novel The Tale of Genji.