Walder Frey

He never was a very trustworthy person when first introduced – at least not the sort of guy you would leave your dog with over the weekend. But then he did the unforgivable and slaughtered guests in his own home: two of the most respected members of the Stark house no less, including Robb’s pregnant wife! Fans all across the world rejoiced when he finally met justice by the end of Arya’s blade.