Originally Posted by keg in kc
There's going to be a lot of infodumping while they introduce new characters...
I can answer a couple of those off the top of my head
1. Benjen Stark. Ned's younger brother. He's the first ranger, the leader of the scouts.
2. Ser Jorah Mormont. He's an exiled knight from Westeros, and I'm not going to say more about him right now for fear of spoilers.
I do know that Jorah told Viserys in that he hates Robert because Robert persecuted/prosecuted him for killing some poachers on his lands. Viserys responded with, "I can assure you that such things won't happen under my reign." So, he's basically in exile and wanting to help the Targaryens because he hates Robert.