Gnarl

Gnarl was the chief antagonist of the Buffy episode "Same Time, Same Place" - he was a type of demon that lived by devouring human skin and was an extremely sadistic, frightening creature, even by demon standards: although a one-shot villain he is notable for being one of the show's more brutal antagonists as he kidnapped a hapless Willow and literally began to eat her alive while taunting her over her fears that her friends would abandon her..