We don't know this yet... don't know anything about the enemy themselves except they exist before the heartless and nobodies.
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they probably got something to do with souls because in Ansems report it said something about the heart, body and soul.
Heart=Heartless
Body=Nobodies
Soul=new enemy
^ If they are prototype of heartless then must have something to do with the loss of the Heart or darkness of the Heart.
Perhaps the heart gets stolen by the dark but doesn't get detached from the body and the body losses its human form like the Nobodies.