An OC ("Original Character") is a socially unofficial character (that is, not everyone agrees that it is protected by copyright, in addition to being probably little known or only known within a limited group of people). The term refers specifically to an original character of an artist or fan of a community.
The term OC is often used in English-speaking communities of art (especially in deviantART), but is also used by Hispanics and other Westerners.
Famous OCs inside the GTS community
Does this wiki accept articles from the OCs of any user?
No, only the OCs of important, relevant or very known users in the GTS community are accepted.
Size Difference Fanon Wiki: the place where you can make your ideas known
There, all your ideas, OCs and stories can be published with minimal restrictions.