You are forgetting a classic: Bloodlines, the peasant’s seventeen times great grandfather was a dragon. Also I’m not sure if anyone mentioned them but the Fey will happily give you power, I wouldn’t trust them at all but they can give power.
It’s:
I’ve been reincarnated into another world and become the protagonist of a galge, but I’ve never been told that I’m being doted on so ardently by a character who’s not my target! ~The protagonist of a gal game with a high level of feminine power is overwhelmed in many ways by the courtship...