2) Rey
One of two characters that immediately sprung to mind when thinking about who The Last Jedi could refer to is Rey. After living her life as a scrappy orphan on Jakku, Rey found out that she had an incredible amount of raw talent in the ways of the Force. In fact, the movie’s title The Force Awakens probably refers to her.
It doesn’t take a large leap of the imagination, then, to assume that the next stage of her journey is to train under Luke and become a Jedi. And, assuming that The Last Jedi borrows as much from the original trilogy as much as Force Awakens did, then Luke will die at the end of the movie – leaving Rey as the true last Jedi.
This is so obvious an idea that we really hope there’s more to it than that. Many fans complained about how shamelessly Episode VII pilfered plot elements from A New Hope, so for the next movie to be just as reliant on the past would really infuriate many.