Robb Stark(First son of Eddard Stark) one of my best character but Robb Stark lost the game of thrones because he didn't play by the rules. He needed to look the other way when the Lannister cousins got murdered. Sure they were kids, but in the game of thrones, you don't go and piss off an ally like the one he had in the Karstarks. But he put his foot down and declared the act monstrous. The inflexibility and honor did him credit, but that's an empty purse. He might as well have cut off his own head when he cut off Lord Karstark's.
Robb also lacked discipline. He shouldn't have married Talisa and instead taken one of the Frey girls as his bride. But he fell in love and that makes things all right in everything except the game of thrones. Robb made so many mistakes, and that's why his death is so powerful. It's the pinnacle moment in the tale where we see how the game of thrones is truly played and you're either in it to win it, or you're dead.
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