I found this new subgenre of "villain" stories, where MC isn't the villain, but a person who isekais into the protagonist, so it's like villain thinks the world revolves around MC, while MC knows the villain has a villain system that steals MC luck. So like the MC has to fight against villains who want to NTR him, turn him into a eunuch, steal his opportunities, knows the original plot, etc.
To begin with they aren't really the original but a spiritual copy of sorts that's artificially made and influenced in their behavior and appearance by all sorts of "concepts" like their class and how humans view things and relationship with their master.
One thing that magi probably deliberately set up is the "master and servant" thing.