Dressed as Cinderella's Stepmother

Is There Any Kind of Person Who Could Be in a Fairy Tale Book, Like Cinderella's Stepmother?

It's like crossing over to Cinderella or Snow White's stepmother to complete her mission, which is to help the prince and princess live happily together. Then there is a book-traveler, where the male protagonist is a villain and confronts the female protagonist, etc. Later, when they are together, they go back and talk about a partner.