Not sure, I just remember something about Masashi saying he'll die eventually without minerals. :shrug:
Where does it say that? ^.o
Anyways, in my book immortal to me means one who can survive without having to maintain oneself via transplants, body possession, or constant maintenance. Lets review your list.
Hidan is an immortal. That is fact. Whether you accept that is your business. He will forever remain in that hole in the Nara woods for all eternity until their supposed judgement day(if it exists in the Narutoverse). Untill then he will be in perpetual pain and suffering.
Reason why I say is he is immortal because from the information we have about him. Even if he is dismembered he will still be able to function as an entity rather than just cease to function like most cases. His supposed "sacrifice" to Jahin (spelling?) allows him to stay immortal without any maintenance. He does not require any special tools or knowledge to keep this incantation active. Only requirement is to kill his opponent and offer it to his "god".
Hidan is
NOT immortal! Very close but not quite. He
can die.
Despite being "immortal", he is still capable of dying from a lack of nutrients.
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If you look at the resource it clearly says FANBOOK. That doesn't sound reliable. Show me better proof please.
Other immortals....let me see.
Kakuzo is not an immortal in my book. He requires constant upgrades to keep himself from deteriorating. If he were to deteriorate then yes he would die.
Orochimaru is what we call the regenerator. He has the capability to remain alive and regenerate his cellular structure into whatever form he wishes. However this requires him to have a sacrifice on which to pass on his "soul" to. He can still die but it would require a skilled opponent of his level or above to figure it out. Naruto's old tailed beast cloak was able to wear down Oro to the point that he had to "shed" his skin.
But whatever maintenance he required is invalid now as Sasuke was able to kill him off (though not completely). And whatever reminiscence of his chakra was sealed by Itachi using Susanoo.
Tobi is not immortal as of yet. We can SPECULATE he has been around for a long time due to his peculiar knowledge of the Narutoverse. Untill his identity is revealed we cannot define his mortality. So for now he is a mortal.
Madara is not immortal. Obvious reason he tells us when he appears in the battlefield of the 4th Great Shinobi War as an Edo Tensei corpse.
Edo Tensei Madara is immortal.....until the IWR technique is cancelled.
Itachi is not immortal. Obvious reason he tells us when he appears in the battlefield of the 4th Great Shinobi War as an Edo Tensei corpse.
Edo Tensei Itachi is immortal.....until the IWR technique is cancelled.
