12. Fenrir Greyback:

Fenrir Greyback is a major ancient evil character. Most werewolves try to stay away from humans while they are transforming, and Greyback is no exception. He transforms Remus Lupin when he is still a child and forces him to live a lifetime as a werewolf.
It makes for a more genuinely terrifying character who attacks families while working for Voldemort. He devastates and destroys many lives by being either an attacker or a turner in his status as a lycanthropic and uses that power maliciously without restraint. Greyback's attacks are nightmares in themselves, and even Dumbledore is afraid of him.
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