[@ReusableSword] Well if it would be a Ifreet which would be no problem he would be vulnerable to exorcisms etc. I think a kind of shamanistic firespirit is more what you are building. Perhaps make him a minor fire deity that is bound to a human vessel? Just a idea but perhaps some god like Ognebog, the slavic fire god who is mostly forgotten?
I don't want to dictate you a char however!