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One of the biggest mysteries of the sequels is Rey's identity. Hopefully this secret will be revealed in The Last Jedi. if not, we will maybe get a clue or two. if the new trilogy follows the formula of the original (which it is so far doing) we will definitely get a surprise about her parentage right before the movie ends, during a climatic scene. In the mean time let's speculate and explore some of the theories going around the internet, and others that aren't.
UPDATE: One of the theories in this article was very close to what was showed in The Las Jedi. So be aware, spoilers ahead
She is the granddaughter of Emperor Palpatine
The Emperor was powerful, cunning, smart, etc., but also lonely. Who is to say that he didn't have lovers, friends with benefits, a secret love interest, etc.? One of these women might have had his child, run away from him or, hid on a far away planet after his demise (and never looked back). It is possible that Palpatine never knew or even met his kid. Or maybe he sent the kid away to hide it from his enemies or to be killed to prevent her/him from one day taking over the Empire. In time she/he had a daughter too and, when her powers started manifesting, her parents got scared due to her ancestry, found a way to block her powers (read about that here), and abandoned her on Jakku.
She is the granddaughter of Obi-Wan Kenobi
We know old Ben had love interests in his past before. Thanks to The Clone Wars, we met one of them: Satine Kryce. It is easy to imagine that in his loneliness on Tatooine, or on a trip outside the system, he might have found a special friend. This special friend could have had his child and, just like with Palpatine she might have run away, hid, been sent off by Obi-wan, etc. If this happened, Rey could be his granddaughter and when things started getting hairy with the First Order, her parents found a way to block her powers and hid her on Jakku for her own good.
She is a manifestation of the force (just like Anakin was)
The Force screwed it up royally with Anakin. So maybe, the Force is trying to right its wrongs by creating Rey to finally balance the force. When her mother realized she was strong in the force, she found a way to block her powers and hid her on Jakku so that Snoke and The First Order wouldn't come after her.
She is the reencarnation of Anakin Skywalker
All powerfull, force conceived Ani might be more powerfull than we even know. his spirit might have found a way to come back from the force afterlife and reincarnated in Rey. And like with the other theories, her parents realized she was strong in the force, found a way to block her powers and hid her on Jakku hoping she remained hidden forever.
She could also be someone elses reincarnation: Yoda, Qui-gon Jin, or Palpatine himself. After all, there are aspects of the Force that the Jedi didn't know about, some of them learned by Qui-gon during his trips.
Her parents are of no importance
Let's say for a moment that her parents are just regular guys that had a very force sensitive daughter. With the First Order destroying the new Jedi academy, they might have panicked, asked Luke (or someone else) to block her powers, and hid her on Jakku. Maybe they left her alone (and never came back) because they knew Snoke would search anyone contacted by Luke about training their kids in the ways of the Jedi. Or maybe they tough she was dangerous and abandoned her out of fear for themselves and the galaxy.
UPDATE: It turned out her parents were nobodies, just simple junk traders from Jakku that sold her as a slave for (as Kylo Ren said it) drinking money. There is always the possibility that he was lying and their real indentity is yet to be revealed. Maybe J. J. Abrams is going to make changes to Episode IX to fix this. we will see in two years.
She was Palpatine's secret project
Palpatine was looking for ways to extend his life. Maybe he created her in a laboratory so he, at some point, could transfer his consciousness to her body. Of course he would have had to make her really powerful. These plans were unknowingly foiled by Luke, Vader and the rebels, and Rey remained in stasis until someone, maybe an Imperial officer in charge of destroying the laboratory, or a dark side acolyte, found her. This person might have felt sorry for her, blocked her powers and hid her in the hopes that she never followed in the footsteps of her creator.
Somehow, she is a Skywalker
Could there have been another Skywalker hiding in the galaxy? Maybe Shmi's sibling? maybe Anakin had an "oopsi" during his time as padawan, or maybe Luke! If so, Knowing you had the progeny of a Skywalker can be scary, and with the rise of the First Order the only reasonable thing to do might have been to hide the child.
Any other crazy theories out there that weren't included in this post? Hopefully we will soon find out the answer to Rey's identity!
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