Robb Stark is the eldest child of Eddard and Catelyn Stark. While he does not have any POV chapters of his own, he is mentioned frequently by the Stark POVs in A Game of Thrones and regularly appears in his mother’s POV chapters in the second and third books.
As the first born child of Ned and fifteen years in age, he was already being groomed to take his place as Lord of Winterfell upon his father’s death. While he is not his mother’s favorite, Catelyn often remarks that she sees a great deal of herself in Robb. He is very close to his half-brother Jon Snow, whom he has never treated like an outsider in the family, and his father’s ward Theon Greyjoy, who had been living in Winterfell since they were ten. Robb is sometimes prideful and boyish, but he is also very dignified and shares the same views as his father on duty and honor. Like all his siblings except for his sister Arya and half-brother Jon Snow, he has his mother’s red hair, blue eyes, and fair skin (he resembles his father in the TV series).
In Game of Thrones, gaining a direwolf that he named Grey Wind, Robb gets into a confrontation with Joffrey with Theon restraining him from attacking the prince. When his father and sisters depart for King’s Landing when Ned becomes Hand of the King, Robb stays behind to manage Winterfell with his mother. When she in turn leaves for the capital, Robb manages on his own, becoming an adult figure to his younger brothers Bran and Rickon. Bran notes that while Robb is his normal self around them, he becomes “Robb the Lord” when discussing business with the servants. He hosts Tyrion Lannister when he comes to visit Winterfell to see Bran, and is told by Tyrion to “learn a lord’s courtesies” while his father is away, given the cold reception Robb subjects him to, given his suspicions of the Lannisters’ part in his brother’s attempted murder.
After Robb receives news that his father was arrested for treason after the death of King Robert, Theon encourages him to go to war against the new King Joffrey, claiming that the Lannisters have already started the war by arresting his father. Robb finally agrees and calls his father’s bannermen, forming an army and marching into the Riverlands. Catelyn meets him there and negotiates his crossing across The Twins on the condition that Robb marry one of Lord Walder Frey’s daughters. Upon learning of his father’s public execution by Joffery’s orders, an emotional Robb formally declares war by naming himself King in the North. From there, he captures Jaime Lannister and holds him hostage to exchange him for Sansa and Arya’s safe return to Winterfell.
In A Clash of Kings, Robb wins victory after victory and becomes even more of a threat than he previously was to the other claimants of the Iron Throne. Despite Lord Tywin’s dismissal of Robb as “a green boy” in war, he proves his strength when he defeats the Lannister armies at Oxcross and other battles in the Riverlands. He sends his mother to negotiate a possible alliance with the late king’s brother Renly, now vying for the Iron Throne with the support of House Tyrell. He is dismayed to learn that during Catelyn’s visit Renly was murdered by an unknown, though it was commonly believed that one of his guards or even Catelyn herself was the culprit. He is also heartbroken when he learns that Theon, whom he had sent to rally his House to Robb’s cause, had betrayed him, burning down Winterfell and presumably killing Bran and Rickon. Unable to reach negotiations with the other claimant, Renly’s brother Stannis, Robb orders that Catelyn return to him. When she returns she secretly releases Jaime from prison into the custody of Brienne of Tarth, on the condition that he bring back Robb’s sisters in return.
At the start of A Storm of Swords, Robb had been wounded in another major battle. He returns to his base and releases his mother from house arrest. He surprises his mother by telling her he had secretly married Lady Jeyne Westerling, whom he had slept with while he was recovering and grief-stricken about his brothers, marrying her the next morning to preserve her honor. Robb is not concerned with the Freys withdrawing their support as they are able to work out an agreement in which his uncle Edmure marries a Frey daughter instead. Prior to the wedding, Robb shows his father’s sense of justice when he executes Rickard Karstark, a distant kinsman to the Lords of Winterfell, for senselessly killing Lannister children who might have served as bargining chips. On their way to the wedding, Robb insists his mother leave the army to be safe, which his mother refuses to do. At the wedding, Robb is polite to the Freys and apologizes for the insult he made to their House. Lord Walder Frey pretends to accept the apology until springing his trap and having Robb’s guards slaughtered. Despite his mother’s pleas for mercy, Robb is stabbed through the heart by his own bannerman, Roose Bolton. As a final insult, Robb’s head is cut off and replaced with that of Grey Wind who was shot to death after being released by Raynald Westerling.