Quote Originally Posted by Tavrobel View Post
Heartless turn back into a human, but the only instance of this is with Sora and Kairi in Kingdom Hearts I. What truly happens for the remainder of the population is unknown, whether or not there is any physical, emotional, or mental change after the reuniting is uncertain.

There is no actual precedent for Nobodies. Your guess is as good as mine, and no, Roxas is not a valid example.
no no no a heartless inst a heart (its called heartless duh) so it cant change back human