As much as we love canon characters and background ponies, sometimes it can be fun to make our characters and write about them instead -- maybe nopony else fits into your story, or maybe you just have really cool ideas for original ponies (or non-ponies). Maybe you just want to use Equestria as a setting and do your own thing, or maybe your story is one of those that manages to be pony without canon characters or Equestria. So many possibilities!
This place is for stories in which most of the important characters are OCs. Canon cast and background ponies in cameos or minor roles are okay, but there should be more OCs than canon characters, and canon cast members should not be main characters. See this thread if you are uncertain about whether or not your fic belongs.
This group is not for stories about the mane six plus one OC. If you have a mane six tag, chances are your fic doesn't belong here.