Riku does NOT have a nobody. Period. Ansem only took control of Riku's heart. He didn't turn him into a heartless, he just used his body.
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Sora later learns that Roxas is his Nobody, created during the events of the first game after briefly turning into a Heartless, and inducted into the Organization for his ability to capture hearts with the Keyblade; however, Roxas later betrayed the Organization and encountered one of Sora's friends, Riku, who captured …However, with Sora unable to seal the incomplete Keyhole, he resolves to use the Keyblade of People's Hearts on himself. This releases Kairi's heart from Sora, reviving her, but also completes the Keyhole and casts Sora into darkness, transforming him into a Heartless while creating Nobody Roxas.
Does Sora have a nobody
Nobodies are born when a Heart is swallowed by darkness and produces a Heartless. They are the remaining parts left behind by the heart: the body, giving a Nobody form, and the soul, giving the Nobody life. However, only those with a strong will such as Sora are actually able to continue on as Nobodies.