2- Ramsey Bolton

I very easily could have put his father Roose on this, as one of the other architects of the Red Wedding. The Boltons, after all, kind of have a monopoly on northern fuckery. Roose at least had pragmatism going for him in the advancement of House Bolton and no longer trusting to follow the Boy King, Robb.

Ramsey, on the other hand, is just wants to flex his sadistic streak. His treatment of virtually everyone he meets, rape and torture of Sansa, torture and mutilation of Theon, as well as murdering his own father, makes me wish Roose had done Westeros a favor all those years ago by deciding to throw baby Ramsey into the river.