What's worse is that a lot of the time an "OC" is just a character the person made up to fit into their favorite universe. Like it's an "OC" but it's some fucking animal that hangs out with Sonic the Hedgehog or whatever. No, sorry, that's not an OC, that's not original at all, and it's barely even a character. If the "OC" is not supposed to be Naruto's best friend or whatever, then 90% of the time it just exists to stand around in cool/sexy poses and/or cosplay. The character doesn't fit into any story and it has no personality beyond being cool/sexy. These aren't really characters either! Maybe at best it's a mascot like the eSurance girl or Mr. Peanut or something. If you can't tell me what your "OC"s childhood was like and how that made them how they are today, or tell me about their family or past, or tell me how they'd react to a certain social situation, they are a shitty character and you are a shitty uncreative human being.
Basically, the thesis of this wall of text here is if you have to say this is an "Original Character" the odds are very good it isn't original in the least.