@Gundlach  
There’s also ponyfications.

Why not just call them FCs for “fanmade characters”?

The canon characters are starting to have existential crises…

oooooooh I understand that OC hate now…

UOC: unoriginal character only on…HBO

@furbyguy  
Well, that could work too.

I always thought OC stood for Own Character. :P

Similar how IDM is intelligent dance music which implies that other dance music is stupid.

@Background Pony #AEB2  
Exactly. I was gonna post the same thing. EVERYONE IS OC.

How about canon characters (CC) and non-canon characters (NC/NCC)? Just a thought.

absolutely. Then again, you’re still technically being creative on the choices of an already existing design by adding to them whilst making it in the style of the show, so you have that going at least, of course, assuming you do attempt to be original about what you’re doing with your OC, otherwise you’re just taking an easy way out in terms of creating new and original characters through a design that already exists and assets that were already made by other people..
 
welcome to every fandom ever.

Well yes, actually.  

No, those characters are original to the creator of the fan fiction. You’re Lauren Faust’s OC.

You’re also an OC. An Official Character.

In the canon, of course.  
_zing