Rabid Ranger
2 is better than one
I'm inconsistently not including Bran as a "main character" in this, but yeah he obviously survives. Arya most likely does - there might be *some* comeuppance but I'd say a more likely end for her is some sort of behind the scenes presence. I *don't* think she gets the happy ending of putting down the knives/subterfuge and living happily ever with Gendry, but it's a possibility all the same.
Maybe Arya becomes Lord Commander of the King's Guard if Bran ends up as king.......