This shapeshifting myth is mainly focused on Werewolves and Vampires. It's found in so many books, due to the fact that it's meant to represent that something that seems and looks evil could in fact be good. However, werewolves often play second fiddle to vampires and zombies in terms of pop culture man-monsters, they have a long and rich history. The most populated form as stated before, would be the bad and evil Werewolf is really the hero in the main story. But in other stories, like the 3 little pigs, the werewolf represents an evil figure who tries to manipulate and tries to trick people into doing their wrong-doings or trying to manipulate the person into trusting them, just to backstab them later on. It is mainly based on Werewolfs, for their known trickery and manipulation. Bears are usually represented as the good guy in a lot of books, but in the rare occasion that it's the main bad villain, the Bear is usually lazy and tries to pull fast ones. Meanwhile, the Werewolf acts fast and plans stuff accordingly.
