Revisionism (fictional)
In literature, revisionism is the retelling of a conventional or established narrative with significant variations which deliberately "revise" the view shown in the original work.
For example, the 1883 children's book The Merry Adventures of [Robin Hood] revised the folklore tale of Robin Hood to depict Robin as much more straightforwardly heroic and less as a thief with a code of honor. This adaptation was immensely popular, and influenced all subsequent modern portrayals. Many original works of fantasy appear to retell fairy tales in a revisionist manner.