Quote Originally Posted by Lost Number
Sort of. There is a Riku replica which was rikus memories. Riku himself is learning to control his dark powers.
I think what KH1992 is asking whether there is a nobody based off of Riku. There may well be, but if so, we haven't seen it yet. Still, it could be argued that Riku never actually became a Heartless, or whether he kept his heart the entire time he was working with the darkness. Riku was surrounded by the darkness, but his heart was supposedly even stronger than Sora's. He might have actually retained his heart the entire time. We'll just have to wait and see.