Do not fear, shadowx. Of course Lost_Demise knows it can't be a Demon, cause she is a Demon and knows they don't do this stuff. And she fights for them to be understood as what they are. So the world won't come to an end
But there are more things that can posses someone than only depression and attention seeking, fears, your shadow parts, several mental disorders. Those are serious. If you want to picture them as demons and then go fight the demons, that's a valid way to cure yoursef off mental disorders. Especially for those who aren't able to face the real problem, which in some cases really is not possible. So it's actuall really bright of the subconciouss to add the mental picture of demons so you are able to fight at least something.