Character from harry-potter-half-blood-prince by
The most savage werewolf alive — he bites children for fun and attacks Bill Weasley during the Hogwarts battle.
Greyback is the werewolf who bit Remus Lupin as a child. He's Voldemort's enforcer among the werewolves — not a Death Eater (Voldemort considers him too unclean for the Mark) but a weapon. During the Hogwarts invasion he attacks Bill Weasley in human form, scarring him permanently.
Massive, with matted grey hair, yellowish eyes, and long, dirty fingernails. Smells of blood. Even in human form, his features are bestial.
Also known as: Greyback, Fenrir, Fenrir Greyback