Appearance
morality
How to think about the morality of this setting:
The creator is a physical materialist atheist, so anyone growing up in a religious background may find this story confusing, but bear with me.
Souls is an alien existence to us as real life humans. I think of it as akin to the Yeerks from animorphs. From a human perspective the ability of demon souls to affect humans and control them is no doubt evil, yet this is just a fundamental matter of the existence of souls. This is what they are meant to do, so in a sense it's kind of like wild animals or a natural physical phenomenon.
Necromancy is the human control over souls, so from the souls perspective it is the reverse, that is the evil. So demons are the will of souls taken form to resist, in self defense, against the evil of necromancy. But because demons exist necromancy is necessary for humans to resist against the demons, so both sides can credibly claim to be in self defense.
Because IRL we are humans and demons don't really exist, it's more fun to read about human drama and life and personal interactions, etc so that side of the argument will be a lot more developed than the human side.
Rather than good or evil, the protagonist is driven by grievances that are simply human.
In contrast to many fantasy stories, where the world is broken, in chaos, or oppressive, or corrupted somehow, the world is stable and working fine. He himself is personally not particularly oppressed though he can pick up the mantle for the poor if he really wishes for a righteous justification for his ambitions. This means, in the general case, he needs to pay a moral price for his ambitions, and it is not freely delivered to him for simply doing the expected thing. A big part of the gameplay is therefore giving him the opportunity to propagandize to make himself appear righteous, as all evil doers in history do.