Juugo's Clan, The Juubi and Natural Energy
~Juugo's Clan, The Juubi and Natural Energy~
Natural energy causes those in Juugo's clan to go berserk.
Juugo's clan is never really referred to by name, it's always just called "Juugo's Clan"*. I believe that Juugo's clan could be the Namikaze Clan.
*Bad translation on the image above
I believe that the clan developed a sealing jutsu that stops natural energy from uncontrollably entering the body. It would be similar to the sealing jutsu that was used on Sasuke's curse mark.
This seal is why Minato (Namikaze) wouldn't have gone berserk and the seal could also explain why he never used Sage Mode, because his seal prevented nature energy from entering his body.
Now a problem that comes up is what about Naruto, why didn't he transform? The answer could be in Naruto's seal.
Naruto's seal is actually Two "four symbols seal(s)" when combined they somewhat resemble the seal that was used to suppress Sasuke's curse mark.
Jiraiya said that "some chakra of the nine-tails slips between the seals and combines with Naruto's chakra"
Maybe the opposite could be true as well. The seal could be designed so that any extra natural energy that Naruto absorbs would "slip between the seals" and go into restoring the foxes chakra.
The Juubi's chakra is natural energy.
The Juubi being made of Natural Energy could explain how the sage divided it's chakra up. Maybe he absorbed the natural energy from the Juubi using Sage Mode and released it nine times creating the Bijuu's chakra. Then he used his own chakra and "Creation of All Things" to give the Bijuu their forms and sealed the Juubi's body creating the moon.
Also the Juubi's rage could be linked to it's natural energy, similar to how Juugo goes berserk.
Karin sensing Naruto's chakra:
Karin compared Naruto's chakra to Sasuke's saying that they seem opposite.
Then she said that there's something dark deep inside of him and we were led to believe that this is the fox. She says the chakra is exactly like someone and I think it may be Juugo.
What could happen next:
Naruto uses natural energy to restore Kurama's chakra, while Kurama restores everybody's chakra whenever they get low.
Naruto uses sage mode to absorb the Juubi into Kurama, changing the fox into a ten-tails/nine-tails hybrid. Maybe shape of the fox, but instead of the fox's fur it will have the Juubi's "skin".
Naruto absorbs some of the Juubi's nature energy calming it down, the opposite of Juugo going berserk when he absorbs natural energy. Basically less natural energy less rage.
Juugo absorbs the ten-tails. This gives the ten-tails a mind along with "feelings and ideals". This may be how the Sage became a Jinchuuriki.