The only surviving son of Lord Balon Greyjoy, Theon was taken away from the Iron Islands as Lord Eddard’s ward against his father’s will, as surety against his attempting any further rebellions. Theon has been treated well by the Starks, for the most part, and is practically like an older brother to Robb in particular. A skilled archer, he’s also arrogant, sly, and a womanizer.
Theon is present when the direwolf pups are found, and suggests they should be put down. He reveals a fondness for the prostitute Ros, but she eventually chooses to go to Winterfell. Later, after Ned is arrested, Theon swears to support Robb as his friend and brother-in-arms, and takes part in the campaign in the south.