The Northerner’s Daughter(s)
As a figure who is absent in real time, Lyanna is ever present through the story despite the sparse mentions of her, much like Ned although he dies in AGOT/season 1 but still is a figure, who is remembered and impacts people’s actions. Initially, she’s associated with Ned and Arya, possibly because of him seeing his sister in his daughter but we find there are indirect associations with Jon as well, as she is revealed to be his biological mother. However, less talked about is Sansa in relation to her on a book and show meta level.
Recently, @abi117 and I were discussing a tonne of things about ASOIAF, and somehow we stumbled on the topic of why the show has implied more association between Lyanna and Sansa(the crypt scene in S5 and the similar hairstyles in the flashback in S6 and in S7), when the books clearly stated that Arya was like Lyanna looks-wise and also in that she was a wild child/had the wolf’s blood, who wanted to fight like Visenya and was good at riding horses. Through a series of discussions we realized that while Lyanna resembled Arya in certain ways, so did she share similarities with Sansa in other, less obvious ways - in terms of characteristics and even journey-wise (especially in the books) to the point where it is scary why we didn’t think of it before. As the story does establish Arya and Sansa as two very different sisters who are meant to be complementary to each other (keeping Ned’s line from AGOT/season 1 in mind), they both are parts of Lyanna split up.