whatever romantic or platonic Jon and Arya ARE soulmates and they will always choose each other before anyone else
Yes!! There truly is no other bond quite like theirs in all the books. I don't often talk about Jon and Arya because, well, lol lmao (if the person who keeps commenting on my ao3 is reading this, kindly leap, as Victarion would say). But really those two just bring me so much joy.
Do I think romantic Jonrya will happen? No. Or, not exactly. I really doubt it will ever be anything explicit; if GRRM does explore that thread, I think it will exist in the liminal—in glances, in quiet (tormented?) longing, in the unsaid. (And isn't that sweeter?)
So let us discuss in ambiguities.
I ended the other ask with: “Duty this, desire that—they always, always choose each other.” To elaborate: they are the reason the other endures, the reason the other is—not as duty demands, but as truth allows. They draw the other back from that inexorable death of self.
When Arya (as far as he knows) hangs in the balance and Jon is meant to be Lord Commander of the Night’s Watch, he breaks and chooses Arya—and thus, Jon Snow. When Jon (Needle) is on the line and Arya is meant to be No One, she breaks and chooses Jon—and thus, Arya Stark. They are mirrors and anchors. They are each other’s soul, salvation, heart (“What do you know of my heart, priestess?”), and smile (“Needle was Jon Snow's smile”).
And yet... they have changed. Jon is no longer the boy of Arya's childhood (“Kill the boy”), and Arya is no longer the little girl of Jon’s (“She could feel the hole inside her where her heart had been”). Still, they imagine the other as untouched, as preserved in the amber of those sweet moments. These thoughts keep alive the core self, but the self has grown a shade darker. A shade colder.
To borrow from Dick Diver in Tender is the Night, “I'm not much like myself anymore.”
How do you come back to someone after so long? After horror, after blood, after choices you never thought you'd have to make have torn you apart and stitched you into something else? After your world has turned inside out and upside down and shaken you until your teeth ache and your head spins and you know you are just not right anymore—all while you were alone? All while the other was not there to bear witness? What can you possibly say to them?
Will they still know you? Will they still love you?
I think, against all reason, the answer is undoubtedly yes.
Which leads to how Jon and Arya stand as foils to Jaime and Cersei. Both pairs share physical features and deep childhood companionship, yet where the latter was wont to withhold truth (“When Jaime had discovered [the picture of her and Rhaegar] she told him it was Queen Alysanne and King Jaehaerys”), the former shared it freely (“…don’t… tell… Sansa!”).
There is something unconditional in Jon and Arya that the Lannister twins never knew. Time and distance made them only closer, only fonder, while those same forces fractured Jaime and Cersei to the point where he burns her letter and walks away. Of course this finds its echo in Jon receiving the Pink Letter; the moment where, as mentioned earlier, he breaks his vows for “Arya” and ultimately dies for her.
The parallel letters expose love under trial. One is consumed, the other endures.
And this isn’t even to touch on how Jon will be altered post-resurrection. Any theoretical/logistical speculation is way above my pay grade of basic character analysis, so I won’t attempt it. But we do know this: resurrection fixates the subject on their dying purpose, their “unfinished business,” if you will. Jon’s mission up until the mutiny was to save Arya (“I think we had best change the plan”). His last thoughts were of Arya (“Stick them with the pointy end”).
Consider not how these darker, colder versions of Jon and Arya (anchored by each other but changed nonetheless) will connect with each other. Consider instead (!) how they will connect with anyone who isn’t them.
If you have been successfully Jonrya-pilled and are interested in how this plays out in a timeskip AU, I am attempting it here :)