Jaehaera Targaryen

 Bio 

She is the younger twin sister of Aegon Targaryen, though she was raised in Winterfell as the bastard daughter of her uncle Lord Paramount Eddard Stark. Upon receiving a prophetic dream, and some nudging from her younger cousin Bran Stark, she set off to Essos to find her long lost twin brother. She had bad luck, however, and ended up being captured for months by an exiled and hunted Petyr Baelish. In the end she was rescued by her brother after her direwolf Wraith managed to find him on the march and get him to help.

 Lovers 

Sansa Stark — Joan initially seduced Sansa as a way to get back at Catelyn, but over time genuine affection blossomed in the relationship, though Joan retained her dominant role in the bedroom.