You know, soft and cute things can be right bastards if we so desire, possessed or not.

But I think your best option is to come up with some, ah... counter measures. Perhaps you might talk to our resident Demon? I believe he had you set on a fetch quest for him that might also help your ...predicament? Not that I have any experience with possession, but just hazarding a guess.

Of course that's an awfully Christian solution to the problem. What might your ancestors have done to thwart evil spirits? Every culture seems to have some kind of ritual. An herb to burn and clear the air? Something to anoint with? A religious talisman to ward it off? Or a prayer of some kind?