My only problem with your first character is the whole returning of the heart. The hearts ceased to exist, that is why heartless still exist in the worlds. Plus I think there would be problems since the nobody is the empty shell of the person, meaning you'd need to merge both back together.
Your second guy is ironclad. I like the creativity in the kingdom.
Zack needs an edit.
Callipso is approved. *Stamp*
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Don't forget newcomers. Kingdom Soul has NO keybearers for this RP at the moment, and nobody is questing to restore Kingdom Hearts or Kingdom Malice.
Just a thought in case someone new is joining.