Still FC/OC
Our standards (Which are never ending changing, see for example Composite Pages *cough*Shaggy being changed to cartoon when Link still has a composite page*cough*) contain a lot of things.
If it's not popular, then it probably won't be able to be here.
If it's a fangame, won't be here (see
The Player he was a page here in VS, but then he was moved to FC/OC there because he's from a fangame)
Characters from Fanfics, AUs, or simply original characters from relatively unknown stories will be thrown there, as you can see by
D&D Homebrew page it's technically not a fanfic, nor an AU, but it's still not enough to be considered part of this verse.
You need to be from a recognizable/popular show, have actual feats (I mean, you don't see every damned slice of life anime character running around here, do you?), and have at least some following and have a somewhat long time running story.
Yes, that may not be true all the time, there may be some exceptions, but those are pretty rare, or they simply weren't deleted, yet.