The cat ears really remind me of Loveless. I've recycled OCs myself, but you may find yourself tweaking their interests or motivations based on your plot. I think it's great to write for character you REALLY know, inside out. Make sure you create a well-rounded supporting cast as well! Romance gets a bit boring if that's all a comic has going for it. Even if it's BL, an over-arching plot (non-romantic!) would really tie things together and keep things moving.
Using roleplaying OCs is actually really common!