Star Wars: The Force Awakens (2015)

The Star Wars franchise was once again awakened in 2015 with the sequel Star Wars: The Force Awakens. It covered a much sought after continuation to the original story. The movie itself have gotten some criticism, since many argue that it does not live up to the same standard as earlier movies, but it still manages to give us some mysterious scenes.
One of those is the scene where Luke Skywalker (Mark Hamill) stands on an island looking at a tomb stone. Who might be lying here? Might it be one of the characters from previous movies or perhaps a character we haven’t heard of yet?