Theon Greyjoy

Prince Theon Greyjoy was the third and youngest son of Lord Balon Greyjoy and his wife, Lady Alannys, and the younger brother of Rodrik, Maron and Yara Greyjoy. Following his father's failed rebellion against the Iron Throne, Theon was taken as the ward of Lord Eddard Stark of Winterfell. After Lord Eddard's execution in King's Landing, Theon pledged his loyalty to Eddard's son, Robb Stark, but chose to betray him by invading the North and capturing Winterfell from Robb's younger brother, Bran, after Robb sent Theon back to the Iron Islands. Theon's men eventually turned on him and Theon subsequently became a prisoner of Ramsay Snow. Theon was tortured to the point of mental breakdown and turned into Ramsay's personal servant and pet, Reek. Theon eventually came back to himself and aided Sansa Stark in escaping the Bolton-occupied Winterfell, before returning to the Iron Islands and supporting his sister, Yara, to succeed Balon in becoming the ruler of the Iron Islands. Yara's rule was contested by their uncle, Euron Greyjoy, and Theon and Yara travelled to Meereen to make an alliance with Daenerys Targaryen, pledging their forces to her cause. Although Theon abandoned Yara during the Assault on the Targaryen Fleet, Theon redeemed himself by leading a successful rescue mission freeing Yara from Euron's custody. While Yara reclaimed the Iron Islands from Euron's forces, Theon travelled to Winterfell with a detachment of Ironborn. Theon perished during the Fall of Winterfell after helping Jon Snow and Bran Stark to escape from the doomed castle atop Drogon. Theon's corpse was later resurrected as a wight and marched southwards to fight in King's Landing, until the Night King's death at the hands of Bran Stark.