•Luke Skywalker does something amazing with the Force. He’s really powerful, more of “wizard than lightsaber wielding warrior.” Basically, Luke Skywalker has a “Force Unleashed” moment and realizes he might be bad for the universe. The aftermath of that event is difficult for Luke.
•For these reasons, to protect the galaxy and himself, Luke retreats into self-imposed exile for many years.
•Skywalker becomes somewhat deranged in his seclusion. He is consumed by his fear that if he should return to “society” his power could be misused, he could be manipulated, and he may accidentally hurt the ones he loves.
•He can’t always control the power. While he sits in a meditative state, he levitates things unconsciously and he’s not always in complete control and he’s never sure if he’s doing the will of the Force or acting on his own passions. Luke is seeing the past, the present, the future, “old friends long gone” and other things that prey upon his sanity.
•Luke Skywalker is described as “creepy and frightening in appearance” because you supposedly can see “the fire in his eyes” behind his grizzled appearance during some scenes.
•For most of Luke’s appearance in Star Wars: Episode VII, it is questionable if his madness will result in evil. Not even those that have known him for most of his life know if he’s sane or not anymore.
•However, the villain and the new hero both draw Skywalker out and he’s forced to intervene in the galactic conflict.
•By the last act of the film, it is clear where Luke falls on spectrum of good and evil.