1.) When Ventus' heart leaves his body, and enters Sora's, after the Chi Blade is destroyed, the state of existence of his body is perplexing. His body is separated from his heart, but would still retain his soul, so for all practical purposes, this being would then be Ventus' Nobody, awaiting the return of his mended heart from Sora. But obviously Ventus simply became comatose and hence could not use his will in order to act out any intentions which a Nobody normally would. Thus, I am made to ponder whether his body's existence is like that of the body of a Princess of Heart/Light after losing its heart. For example, when Kiari's heart left her body and went into Sora's, her body did not become a Nobody because she did not become a heartless, due to her having no darkness in her heart. As such, when Ventus' heart was ripped from his body, it was currently incomplete, as Vanitas, Ventus' manifestation of darkness, was not yet returned to Ventus' heart, and so at the time Ventus was for all practical purposes a "Prince of Heart/Light," and then no heartless could be formed and his body would simply be comatose as Kiari's had been. Sora's heart is now in the process of mending Ventus' heart with Vanitas. I now know that Nobodies can grow hearts of their own over time, if they are nurtured, but am I right to assume that Kiari's body would not have grown another heart, and thus Ventus' body will never grow another heart?
2.) When Sora releases his heart, Kiari's whole healthy heart is able to return to her body, but Ventus' broken heart is too weak to leave Sora's body, and so stays in it, causing Sora's Nobody, Roxas, to actually be Sora's body and soul with Ventus' heart. Sora's heart then becomes a heartless, but he still retains his memories because of the strength of his heart, similar to Ansem-SOD. However, when Kiari hugs Sora's heartless, it takes on the appearance of Sora's lost body. This means that between the time of Kiari hugging him in Hallow Bastion to him being woken up in Twilight town, he was not actually "Sora," for he did not have his soul or body. This means that Sora was some how the inverse of a heartless, a "Heartful" for all practical purposes, likely somehow caused by his contact with a Princess of Heart/Light. The heart is what contains memories and emotions, and so when Sora enters Castle Oblivion, the Organization uses Namine to take apart Sora's memories, thus taking away pieces of his heart. They then insert these memories into Roxas, whom thus then carries pieces of Sora's heart. Hence, when Namine puts Sora to sleep for a year, and Riku subdues Roxas in order to take him to Sora to recomplete Sora, really what is happening is Riku is recompleting Roxas by bringing him to the last part of Sora's heart which Namine has sleeping. Once Roxas becomes complete again, turning back into the actual, complete Sora, Sora wakes up (though technically this should not have happened since Roxas should have just transformed into Sora - nothing should have been left inside the sleep-capsule Namine had enclosed "Sora" within.) As mentioned already, Nobodies can eventually grow their own hearts, and so Roxas, with his connection to pieces of Sora's heart and the broken heart of Ventus, thus having an understanding of how to care for a heart, grew his own. This heart then became a part of the recomplete Sora. It wasn't until Sora's and Roxas' hearts dueled withing Sora's body that Roxas accepted his place and merged completely with Sora's, allowing Sora to remember Roxas' experiences as a Nobody and his connection with Namine. Kiari's pseudo-Nobody. Terranort used a keyblade to unlock his heart, which then became a heartless, Ansem SOD, which had a humanly form with his memories. This heartless, Ansem SOD, presumably unable to weild a keyblade, then possessed Riku, whom was a keyblade weilder through Terra's initiation ceremony. This then allowed Ansem SOD to call forth his keyblade which has the power to unlock hearts, just as it had unlocked Terranort's heart, and just like it had unlocked Vanitas from Ventus' heart. Sora then used this keyblade to unlock his own heart. Is this how Sora was able to keep his humanly appearance without his body? Maybe Ansem SOD started out as a mere shadow heartless too and slowly formed into his final form, and perhaps Sora's heartless' maturation into Sora's image was sped up and inversed by contact with Kiari?
3.) Namine is somehow a Nobody formed from Kiari, Sora, and Ventus. She has Kiari's gender, Ventus' hair, and control of Sora's heart. Is this a direct metaphor, showing how both Kiari and Ventus had a stake in Sora's wellbeing at the time when Sora became a heartless? Namine was born in Castle Oblivion, where Ventus is currently sleeping. Was Sora's body essentially split in half to accommodate Kiari's released heart's necessity to have a counterpart Nobody? If this is true, then as Ventus is currently essentially a "Prince of Heart/Light," then the same could be true of his heart's necessity to have a counterpart Nobody, and thus Sora's body was slit apart into Roxas and Namine, Roxas being the Nobody of Sora's heart, and Namine being a combination Nobody of both Ventus' and Kiair's hearts, leading to her appearance as a cross-product of the two. However, Namine was only created after Sora "undid" himself in Hallow Bastion, not when Kiari or Ventus lost their hearts from their bodies, reinforcing the concept that they themselves could not form Nobodies due to the nature of their hearts having no darkness at the time.
4.) When Xehanort releases his heart from his aging body to possess Terra's, does his body simply die from old age or does it become a Nobody? If it became a Nobody, whatever happened to it?