User blog comment:Angel Emfrbl/Fan Made Characters/@comment-124015-20100323171143

OOC means "Out-of-character," just FWI. As a fanfiction writer, I give my OCs ("Original characters," the term you're looking for) as much backstory as I feel they need. My One Piece character Carroll D. Jabber, for example, has a tragic backstory that shaped his current personality. Another One Piece OC, Mo'Ziro Shank, has no real backstory, so I compensated by giving him a cool and quirky personality.