Board Thread:General Discussion/@comment-10502460-20190109235250/@comment-35616940-20190110183424

E. L. James published her twilight fan-fiction as the 50 Shades series. I've never read either work, so can't say whether either is good. An author by the name of Anna Todd, published her One Direction (British Boy Band) fan-fiction as a novel called After, and is in talks about getting it turned into a movie, again I've not read the book.

RWBY (Anime/Manga) started out as fan-art.

Marvel/DC: Marvel copied 16 heroes from DC, whereas DC copied 9 from Marvel, here's a short rundown: Black Cat/Catwoman, Aquaman/Namor The Submariner, Doctor Strange/Doctor Fate, Bumblebee/The Wasp, Thanos/Darkseid, Mockingbird/Black Canary, Red Rocket/Iron Man, Atomic Skull/Ghost Rider, Deadpool/Deathstroke, Hyperion & Sentry/Superman, Red Lion/Black Panther, Guardian & Commander Steel/Captain America, Quicksilver/Flash, Imperiex/ Galactus, Swamp Thing/Man-Thing and The Avengers/Justice League, X-Men/Doom Patrol.