@ Elfboy
I really don't see any Te in Catelyn. She is driven in her life bij her sense of duty (SJ) and her love of her family, her children in particular She's constantly trying to fulfil their needs and she puts her own needs away for them. She also sympathize with other people quickly, like with Brienne. I think she's most likely Si > Fe (ISFJ)
Robb I find difficult to type, because we don't see much from him personally in the first two books/series. I don't know if he's a POV character later on, but I hope so. So far I don't see NF in him though. He's much alike his father working in the traditionally way, doing his 'duties'.
I see Bran as an INFP because of his "shy" nature and ability to see right through things. The way he connected to dreams and magical stuff seems very NFP.
Theon seems to me a risk-taker, loving action and war. He's smart and knows strategies to fight, but if he has taken what he's fighting for he can't keep it (I don't see any long-planning J in that). I don't think he is very good in imagining what other people are thinking and feeling. He can't motivate other people to stand by his side.
Cersei is an ESFJ, just not a typical one. I believe she's an ESFJ "gone to hell" (to use your nice choice of words). She's a control freak first class. She rules by manipulating other people emotionally. She can be very charming and she's trying to read other people's minds, focusing on their motives and beliefs. I don't see a strategical rational planner here. She keeps a lot to herself (though probably she'll share it with Jaime) but I believe this is because of her "gone to hell" / traumatic experience with her marriage.
About Viserys you're probably right.
