.... so the only thing that makes demons different that humans other than their physical appearance is that they prioritize they're own well being over others?......just like humans....
The difference between demons and humans is that demons have different physical appearances, the family magic thing, they also have trouble with physical coordination with each other (like dancing and such), they have some issues with long term commitment or just with doing a repetitive action (not sure which), and about the prioritizing themselves part, they do that more than humans, generally, you would have a few humans who would go into action to save someone, but with demons, unless the other has some relation to them in some way, they wont lift a finger
.... Is that mean.. Opera wont help clara and others if they are not iruma friends?
And also this is one of the moment where i find those.. Demons is similiar with human