Fenrir Greyback is a nasty character from J.K. Rowling's Harry Potter series. He's a werewolf who has a penchant for attacking children and turning them into werewolves. He was the one who bit Remus Lupin after his father angered Fenrir.
While he hangs out with the Death Eaters, he is not a full member, probably due to the low regard that wizards have for werewolves. Fenrir does not have a Dark Mark, and must rely on others to summon Lord Voldemort.
During the story arc of Harry Potter, Fenrir attacks Bill Weasley and maims him. Bill was not turned because Fenrir was in human form but he now prefers his steaks rare. Fenrir also attacked Lavender Brown during the final Hogwarts battle. He is finally defeated by Ron Weasley and Neville Longbottom.
Fenrir was played by Dave Legano in three of the films where the werewolf makes an appearance. Unfortunately, Legano died soon after the final movie premiered.
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