Hags are great for this. One there are a number of different Hags, and Hags are easy to buff, by placing them in a coven.

In my homebrew I have a Queen with a coterie of Handmaidens, all are Hags. All change their appearance constantly, but often look like sisters.

The members of their organization (it is less a kingdom, and more the plotters to create a kingdom), know to treat all orders from a Female leader to be as from their Queen, because no one ever truly knows what their Queen looks like, and the Handmaidens are legion and nasty.

Nearly every D&D book with monsters in it has a new Hag variety in it....which gives me a lot of RAW options. 🕺