Oh, I definitively love sharing my OCs on art fight! Then I start writing more on their profiles. Then I develop their traits and backstories more and more... then I want to feature them on my stories because I've gotten attached to them xD
Almost all OCs I end up making are part of a world/universe that I'm already writing, even if they're not directly related to the plot (like the younger sister of a secondary character...). I guess I just gotta see if it's worth to put them on the existing main story or maybe make a side story lol