Yeah! So long as the OC is like beside a DMC/DmC character.
I haven't made a specific folder for stuff like this, but the folder "With Other DMC Characters" would most likely help in this instance.
Though, if your not sure where to submit something in the future, go ahead and put it in the featured folder. Normally I go in and sort everything out that way (though it takes me forever to actually get to it, my apologies).