RE: The Naruversity
Another Theory! (Because I like keeping knight504 in a constant state of "being behind on updating the links in the first post."
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Six Paths Chakra: What the heck is it?
Based off of, and revised and expanded from
this post I made in the Naruto Question thread.
Six Paths Chakra can be described as exactly that. That is, the chakra of the Rikudou Sennin (and his mother and brother.) Six Paths Chakra is the chakra that is acquired by eating from the fruit of the Shinju.
This chakra cannot be entirely passed down or inherited in its full form. Kaguya has huge "Six Paths Stamina" and large quantities of Six Paths Chakra flowing through her pathways, but neither Hagoromo nor Hamura can be said to have fully inherited it.
Hagoromo inherited Kaguya's Six Paths Physical Energy, and her Rinne Sharingan, albeit in a watered-down form, the Rinnegan.
Hamura inherited Kaguya's Six Path Spiritual Energy, and her Byakugan and All-Killing Ash Bones.
At some point after Hagoromo sealed the Juubi's body and Chakra within himself and/or Kaguya was sealed within Chibaku Tensei, Hamura gave Hagoromo his Six Paths Spiritual Energy, and then left for the moon some time afterwards. At some point between these two events, Hamura fathered the Progenitors of the Hyuga and Kaguya clans.
After being gifted with the Six Paths Spiritual Energy by his brother, Hagoromo sired two Children, Indra and Ashura. Indra inherited the Six Paths Spiritual Energy and the Rinnegan, but, due to not having the Six Paths Physical Energy, his body wasn't strong enough to withstand the full Rinnegan, and it devolved into the Eternal Mangekyo Sharingan. Ashura inherited the Six Paths Physical Energy, as Hagoromo only had one special power to pass down compared to Hamura's two (even if the Rinnegan was definitely the best.)
It should be noted at this point that, as anyone who's ever seen a Yin-Yang symbol before knows, there is a little bit of Yin in the Yang half and vice-versa. Therefore, it would be more accurate to say that Hamura and Indra inherited a large quantity of Six Paths Spiritual Energy and a comparatively much smaller amount of Six Paths Physical Energy, which they could combine to use Six Paths Yin Release/Power. Hagoromo (initially) and Ashura inherited a large quantity of Six Paths Physical Energy and a comparatively much smaller amount of Six Paths Spiritual Energy, which they could combine to use Six Paths Yang Release/Power.
This is not to say that Indra was limited to Yin Release Jutsu and Ashura Yang, as while Indra had Six Paths Spiritual Energy, he had regular Physical Energy, with the opposite being true of Ashura.
Fusing the chakra of Ashura and Indra (or their Transmigrants) creates the Original Six Paths Chakra that Kaguya (and later Hagoromo) possessed.
But what is Six Paths chakra? Well, simply put, it's like Chakra but better.
One person who we know had Six Paths power temporarily, without other factors like transmigrants, Tailed Beast chakra, Natural Energy, Hashirama cells or the Rinnegan is Kakashi. Obito stole some of Madara's Six Paths Chakra, and later gave it to Kakashi when he migrated to him.
It allowed him to do stuff like this:
It makes you stronger/faster and increases the strength of your Jutsu.
The ""diluted" Spiritually-weighted Six Paths Chakra that the Uchiha possessed allowed them to generate black fire once they had acquired their Mangekyo, as well as craft incredibly strong Genjutsu. The best Medical Ninja in the world is a Senju, Hashirama's bloodline gave him an incredible healing factor, and a great deal of his Mokuton Jutsu probably, unbeknownst to Hashirama, also incorporated Physically-weighted Six Paths Chakra, or Six Paths Yang Release, seeing as Yamato's elements are Water, Earth and Yang, and Zabuza used Yang Water Hand Seals to supercharge his Water Dragon Bullet. That's why Yamato's Mokuton could never measure up to Hashirama's. As he wasn't Ashura's transmigrant, he didn't have any Six Paths Yang chakra, or at least far, far less. Trace amounts, really. He has "Diet Six Paths Physical Energy."
The 3rd Raikage and Darui, with their Black Lightning, are probably like the Gold and Silver brothers in that they're related to Hagoromo, albeit probably more distantly.
* Considering that some Senju left and became Uzumaki, I'd wager that a few other Senju also migrated to Lightning Country and ended up siring some of the ancestors of the Raikage.
If Indra and Ashura chakra is combined to form Six Paths Chakra in an Uchiha, i.e, Indra's descendants, their chakra is strengthened, but nothing else. They don't awaken the Rinnegan, because they don't have a "Body of the Sage" that can withstand the "Eyes of the Sage." However, if they find a way to strengthen their body, such as a healthy infusion of Hashirama Cells ("It does a body good! 10 out of 10 Med-nins recommend!") they'll awaken it after enough time has passed for their "Chakra DNA" to be re-written or whatever. This is what happened with Madara, Obito and Sasuke (although as Sasuke's Hashirama infusion was different, being healed by Kabuto, I doubt he'll ever acquire the Mokuton.)
If the combination occurs in a Senju/Uzumaki, they also get Six Paths Chakra and even stronger bodies (stacking the durability/stamina boost of their bloodline with the strength speed bost of Six Paths Chakra,) as well as stronger Jutsu. Also, if they yoink a Sharingan from an Uchiha, they'll awaken the Rinnegan too, and probably much faster than Madara did, as upgrading an eye is probably a much simpler process than upgrading an entire body.
Adding Natural Energy to Six Paths Chakra gives you Six Paths Sage Chakra, which allows you to make Truth-Seeking Balls, and was what Naruto was using before Sasuke showed up, when he kicked Madara's Truth-Seeking Ball away.
Six Paths Sage Chakra is also what grants the bearer the power of flight, despite Kakashi's musings in Chapter 680. Kaguya had access to Natural Energy after merging with the Shinju, Hagoromo gained access to Natural Energy after sealing the Ten-Tails within himself, Madara and Obito gained access to Kaguya's Six Paths Chakra after unknowingly becoming a Jinchuuriki to her as well as the Natural Energy from the Shinju, and Naruto also knows Senjutsu.
Seeing as Sasuke and Kakashi are the only two that gain access to Six Paths Chakra, Yin-weighted or otherwise, but don't get any Natural Energy, and they are also the only two who do who can't fly (without winged Susanoo,) this is a safe assumption to make.
If you add Juubi chakra/chakra from all 9 Tailed Beasts to Six Paths Sage Chakra, you get Six Paths Sage Technique, or if you've already learnt how to use Senjutsu, Six Paths Sage Mode.
This theory also neatly explains the Tenseigan. Despite Hamura gifting his Six Paths Spiritual Energy to Hagoromo, he still had traces of Six Path Chakra within him. The Hyuga, descendants of Hamura, also all have small amounts of Six Path Chakra, concentrated and bound within their eyes. Sealing countless Byakugan, all containing tiny amounts of Six Path Chakra, away for millennia allows a massive amount of Six Paths Chakra to be stored up. Add a huge quantity of Six Paths Chakra to a Byakugan, and you get the Tenseigan and Tenseigan Chakra Mode.
*Actually, considering that Madara only started using Storm Release after reabsorbing the Shinju (the alternate form of the Gedo Mazo that likely contained Kaguya's soul and a sizeable portion of her Six Paths Chakra,) in addition to the fact that Hashirama (with his Mokuton) was also descended from Ashura, I'd guess that all combination-element Bloodlines require a relatively minuscule degree of Six Paths Chakra, and those that bear them are either distantly related to the Senju, or are descended from Jinchuuriki of Tailed Beasts that have the corresponding Advanced Element. Perhaps one of Mei's Grandparents or Great-grandparents was a former container of KokuÅ.