Most of these I think would work as TV shows, but some are movies.
-Undertale: This would make a great TV show...and maybe they could ACTUALLY EXPLAIN WHAT HAPPENED TO GASTER ASDFGHJKL
-Spirit Animals: They are making one, but I mean a movie about the fourm. Imagine the drama: Catspirit vs. Catspirit, The Great Hacker Incident (When all the mods and a bunch of other posts got deleted), Cole being kidnapped...so many great plot points.
-Wings of Fire: They deserve one. The series is GREAT.
-39 Clues: This could be a TV show set, like, after the books. It would be AWESOME.
-The Non-Princess: Remember how everyone was making up a movie where the Disney character isn't a Mary Sue? Now it has a name.
-Underverse: Same as Undertale, but as a complete, animated movie. There could be comic mangas or something explaining The Truce and X-tale... (It's most likely no one here knows what Underverse is, but seriously. The series is so cool it deserves at least a real, Netflix original or-something TV show)