After Sunday's episode of Game of Thrones, fans everywhere likely yelled out a collective "What the Hell?!" when the Waif stabbed Arya multiple times and left her for dead at the bottom of a river. And rightfully so, since Arya actually dying hasn't been a real worry ever in the series. She's kind of scrappy, and gets herself out of pretty much any dire situation she finds herself in. But the theory about Arya and the Waif being the same person is just obscure enough to be a real possibility. The theory, posted by one particularly crafty Redditor, states that Arya and the Waif are the same people and have been since Arya arrived at the Hall of Black and White and drank the water there. In the water, was likely something which elicited this multiple personality in her, giving her a way to lose her true self and become "no one", as Jaqen H'ghar has repeatedly told her to do.
And as hard as it is to believe that Arya stabbed herself and is this intent on becoming "no one", the evidence is piling up to support the Game of Thrones theory that Arya is the Waif. You have to admit, it would be kind of the best hoax of the series so far. Jon Snow's death not withstanding and no, The Hound's reappearance doesn't count either.
If it comes to be true that Arya is the Waif, then we really have been taken for a ride on Game of Thrones, fooled every single time we saw the Waif with either Arya or Jaqen. As Reddit user _JeRM predicted, this is a pretty legit exchange to come from the fight we just saw:
"Arya and the Waif do battle, and after fighting valiantly, Arya is killed. We are all fucking stunned for a few moments (maybe even 30+ minutes if they decide to show other scenes elsewhere).
The Waif goes to Jaqen and announces that Arya Stark is dead. The waif removes her face to reveal that it was Arya all along, and Jaqen asks who a girl is.
A girl replies "No one." - Credits."
We've already seen the first part of this prediction in Episode 7, and with Episode 8 titled "No One", it stands to reason that not only will we get to see Arya again, but it might be the episode where all is revealed about who she has been and who she is going to be now. As for the part where we saw the Waif stab Arya repeatedly, this is believed to be just another way for Arya to "kill" herself and become no one, effectively keeping the part of her that is the Waif and getting rid of Arya.
Redditor catNamedStupidity made good points in their original post though. And while it's hard to come to terms with Arya possibly doing away with the Arya Stark we've grown to love, we can't ignore that the idea of Arya and the Waif being the same person could very well be what "No One" means for Episode 8.
We Only Ever See The Waif With Arya Or Jaqen
Now, this could be because there is no real use for her to interact with anyone else in Braavos, but it could also be because she is Arya. When Jaqen interacts with Arya or wants to speak to her, he always prefers to do it in private. When he asks the Waif to leave, it's like he's really asking Arya to quiet that personality for now so that he can speak to Arya Stark.
She Always Knows What Arya Is Up To
If the Waif is a real girl, then she is likely just super jealous of all the attention Arya has gotten from Jaqen, and therefore is keeping tabs on her because she's basically obsessed with Arya at this point. But if Arya and the Waif are actually the same person, then that is how the Waif is always creeping around the corner, watching Arya, ready to report to Jaqen when Arya isn't "there" so that he knows what's going on with the two halves battling for Arya's body, basically.
The Waif Has Been Against Arya From Day One
Again, chalk it up to weird jealousy that just won't quit (can a girl get a freaking break?), or consider the Waif's extreme dislike of Arya to be because that part of her hates Arya, the girl with the past who is not "no one" yet. By that logic, yes, the Waif would hate Arya because the two are fighting to see who comes out stronger and diminishes the other.
This also brings up an interview Maisie Williams (Arya) and Sophie Turner (Sansa) did with Yahoo!, when they played the game "2 Truths and a Lie." For those who don't know the game, which can be a slippery slope when giving away Game of Thrones spoilers, the person in question has to say three sentences, two of them being true and one being a total lie. Maisie Williams had this to say when it was her turn:
“Arya goes to Westeros, back over the sea. Arya is in the trailer more times than people have realized, because they don’t realize it’s her. Arya doesn’t cross any more names off her list.”
Now, without getting too fangirl-y over the craziness of two of these being true, let's say for a minute that the theory about the Waif and Arya being the same person is true. Then, it could only mean that Williams' second truth/lie is the real deal. Since we'll likely find out the fate of Arya by the end of Game of Thrones' Season 6, and hopefully in Episode 8, "No One", then it will be pretty black and white. Either Arya Stark is still Arya Stark and now wants to get the Hell out of Braavos even more, or her persona the Waif succeeded in killing that part of her and will reveal as such to Jaqen H'ghar.