Wow! WILL LUKE BECOME A FALLEN ANGEL? "‘Star Wars: The Force Awakens': Will Luke go dark? Let’s try to shed some light. "- The Washington Post

That would be really shocking, & Biblical, (ie satan was originally a good angel). But I would hate to see good ol' luke go bad.

https://www.washingtonpost.com/news/comic-riffs/wp/2015/12/10/star-wars-the-force-awakens-will-luke-go-dark-lets-try-to-shed-some-light/