[Jurinjo]

A tortured warrior spirit haunted by death but never dying. He lives in the mortal in an innocuous (and rather adorable) form of a two tailed cat. For some reason the party decided to investigate the little oddity. Eventually taking on a surprisingly large quest with lots of history- some connected to their own main villain. At the end they can either fight the spirit allow him eternal rest. Or he can fight along side the party for a reason depending on your dialogue options. Like revenge or a promise you make that if he helps you you'll free him. It'll affect him combat style subtly and part in the game's story.