The protagonist is in a position of aristocratic authority in Fantasy/Isekai. Includes Aristocracy/Nobility, Villainess/Villain, Duke/Duchess. The protagonist may also attain aristocratic authority (influence, political power) later in the story.
Note: this list excludes protagonists that are Royalty or Imperial Family (Prince, Princess, etc), and stories that are "Book World" or "Game World". Child protagonists will also be excluded (refer below).
Child protagonist with aristocratic authority in fantasy/isekai here
Protagonist is a Servant, Royalty, or a Saintess/Saint in Fantasy/Isekai here
Protagonist was thrown into a Novel/Book world here (Female Protagonist) here (Male Protagonist)