Oh Robin.... he was named Robert in the books, by the way, just like the king.
As for Arya, there's really no way for her to become a proper knight in that society, and I'm not sure that's what she wants. She's feisty, but she doesn't share Bran's desire to become a knight, I think. What she *can* do is become a capable swordswoman.
Must keep up our bare breast quota, or else the masses will start migrating over to Came>yawn<lot.
To be fair, though, True Blood has some pretty decent stories; not as thick and enmeshed and intriguing as Game of Thrones, but still entertaining enough to satisfy higher brain needs. And good story/production/acting + lizard brain food = POPULAR.