Abnormally Normal
They make use of the archetype Christopher Vogler calls the Shadow.
Folktales, archetypes—these are expressions of primeval essences that sit in our back-brains and howl. Joseph Campbell compiled folktales and archetypes from all over the world. Christopher Vogler boiled down much of Campbell’s work to a single, lovely book called The Writers Journey: Mythic Structure for Writers. In it, he writes, “The archetype known as the Shadow represents the energy of the dark side, the unexpressed, unrealized, or rejected aspects of something. Often it’s the home of the suppressed monsters of our inner world.”