Robb Stark
King in the North
My pick is Angel and Cordelia. I thought about Willow and Xander, but the way that Angel and Cordy grow together over the course of the Angel series is pretty incredible. As a friend, I don't think Angel was ever closer to anyone. I think they really fell in love with each other as friends (which was probably where they were both better suited), and they needed one another, not so much as lovers, but as true friends.