Tywin Lannister

Tywin Lannister is the true primary antagonist of Game of Thrones. He is Lord of Casterly Rock, Shield of Lannisport and Warden of the West. Tywin is one of the most powerful lords in Westeros. He is the father of Jaime, Cersei, and Tyrion Lannister. He loves his children Jaime and Cersei, but despises Tyrion. This is partly because Tyrion is deformed, but also Tywin blames his son for causing his beloved wife Joanna's death during his birth, as well as for shaming the family name with his frequent whoring.