Honestly... you just really have to scrounge. As long as you don't look in fandom, you're likely to be able to use an oc. As far as combat based? Nothing I have seen but recently my craving is modern so maybe fantasy has something? Otherwise, if you have ideas or a system, you can always start...
If you are looking for a group RP just check out the other threads below yours. If you prefer 1x1, go to looking for partners. :) just check and see what interests you. This is realistic modern but there are other genres under the looking for group category.