Jojen Reed from A Clash of Kings is the brother of Meera Reed. They come to Winterfell for a harvest feast and stay around because they feel drawn to Bran. Jojen has special abiltiies and can fortell the future. They help Bran to deal with and accept his own special abilties. They help Bran and Rickon escape when Winterfell is taken. They are going to help Bran find the three-eyed crow that they both dream about. Jojen calls them 'green dreams'.
