This is an element of my novel series' setting. I'm not trying to advertise it, but if you want more details, and how to access my so far only published book, DM me. I will warn you that only after publishing 1st edition did I realize how important accessibility is. The subject matter is confusing without my old writing style already. The only people who finished it are writers who knew to move on if they didn't understand something, while my relatives gave up after the first page.
The way I interpreted demons or devils is based on Islamic myths. "Jinn" or "spirit" is the term I use for all such creatures. "Demons" or "devils" are those antagonized by angels, or are spirits that actively oppose them. According to the myth, humans, jinm, and other intelligent creatures that supposedly lived on earth, all have free will, while angels do not. I don't see my demons as a manifestation of evil, but people with flaws. Angels, however, I've discovered are evil themselves, but believe their collective decisions are completely justifiable. They only appear as good cause they're overall very good at PR and propaganda.
As for stuff outside of my work, I've been told Lord of Light has a similar vibe to my book. God's Demon is a book about demons aka fallen angels going to war in hell. I didn't entirely like kt though and did not read the sequel. I found some of its ideas interesting enough to finjsh the first book at least.
I'll reply to this if I think of more. I have one or two artbooks in mind, but I don't remember their names.