Something else I thought to add, as far as explaining part of why this alter is so difficult for me to work with:

With other alters and fragments, I've been able to identify how they fit into my history. Approaching a child alter for example, was like, "You are a part of my childhood, a part of me, and you belong with me." I've been able to feel that way because I could identify parts of them (in time) that were indeed parts of me, such as a cluster of memories, emotions and perceptions from my childhood or adolescence. For example, one simply held memories and feelings over a pet fish and a few other things. Those are my memories and my feelings, that were a part of my childhood, and I absorbed them back into my consciousness in time.

With this remaining alter, I don't feel that way and can't pinpoint such things. I can understand in a way how this alter probably came to be the way it is. I grew up in a very extremist religious environment, where the religion was very corrupted and used as a tool to shame, intimidate and otherwise abuse. It was commonly included as a theme during abuse that I can remember. I wouldn't say that it's up there on the scale with ritual abuse, but there are some similarities. To my memory it wasn't ritualistic in nature, but there were just strong religious themes. So it doesn't surprise me at all to have an alter that thinks it's a demon.

But unlike other alters and fragments so far, this one doesn't seem to have any context. It feels like it was created out of thin air. It doesn't seem to come from a time period, have any traits like beliefs, interests, purpose, habits or anything along those lines. It seems to consist of just malice, madness and believing it's a demon. I can't find anything to use for relating, no common ground, no evidence of context like time, place or anything.