Namine came out because she technically did become a Heartless, before they found the bodies of the Princesses after defeating Riku/Ansem, then Sora gave up HIS heart to save her, turning him into a Heartless, but eventually, since Kairi's heart was found, his heart was passed back to him when she embraced him as a Shadow. By the way, why would he be a Shadow? He should've been something stronger.
Revan is one of the greatest Jedi of all time. Danzx made this Sig and Avy for me