In the Harry Potter universe, Remus Lupin (David Thewlis) and Fenrir Greyback (Dave Legeno) look very different as werewolves — here's why. J.K. Rowling's take on the European folklore concept that has existed for at least a millennium brings great depth to it, as it shows multiple sides of lycanthropy. Lupin and Greyback stand on opposite sides of the spectrum, and their wolf forms are a means to visualize just how different they are as people, as well as the nature of their relationships to their own afflictions.
Fenrir Greyback was a notorious Death Eater with a sadistic interest in attacking children and a personal goal to turn as many witches and wizards into werewolves. In 1965, he was arrested by the Ministry of Magic on suspicion of killing two Muggle children. None other than Lyall Lupin, Remus' father, vouched for Greyback to be imprisoned, and insulted werewolves, saying they're "soulless, evil, deserving nothing but death." Greyback responded to Lyall's bigotry by attacking his four-year-old son. Remus' family had to live with this tragedy, keeping their son isolated for his (and everyone else's) safety. Remus lived a poor, itinerant life until James Potter took him under his wing. When the Potters died, Remus went back to a lonely, miserable life, unable to hold a job for more than a few months (or until people figured out his condition). When Voldemort (Ralph Fiennes) rose to power again, Dumbledore (Michael Gambon) recruited Lupin once more and offered him a better life at Hogwarts and with the Order of Phoenix.
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While Harry Potter's Remus Lupin hated his lycanthropy, Fenrir Greyback fully embraced it, earning a beast-like appearance as a
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