Tailed Beasts = Kekkei Genkai Analysis/Rant
I feel like it’s fairly obvious, but all Kekkei Genkai comes from Tailed Beasts, passed down from jinchūriki.
We saw the Sharingan, Byakugan and Rinnegan start to exist when Kaguya consumed the fruit. And we saw the Mokuton (Wood) and Shikotsumyaku (Bone) when Kaguya finally merged with the God Tree, creating the 10 Tails, and as a jinchūriki, passing down the Kekkei Genkai to her sons and grandsons. And we see that the other Bloodline Limits bare striking resemblance to jinchūriki abilities.
But the thing I keep thinking about is, how? Outside of Kaguya, who physically became one with the 10 Tails, the others weren’t biologically connected to their Beasts. Did the jinchūriki do it? Did they purposely give their containers abilities? Or was it like radiation? Over time they changed? Or the way they were sealed?
There’s a pretty big difference between Gaara’s sealing and Naruto’s. Naruto’s sealing, coming from 2 of the most skilled fuinjutsu ninja of the time - one of which came from the clan that mastered fuinjutsu - must have been the prime. Maybe why he never got an ability? Gaara, on the other hand, was done by a medic ninja with a specialty in poison and puppetry. Remember Suna was poor for quite some time and the seal needed a compatible child. And the seal was terrible. But Gaara did inherit an ability. So, if Naruto, with the best sealing, had the most distance from his Beast and did not gain an ability while Gaara, with the worst sealing and closest connection to his beast (by sealing not personal connection), did, in fact, gain an ability and a strong inclination for it then we see a pattern.
BUT, Gaara’s father, Fourth Kazekage Rasa, also had the ability. Just like the Third Kazekage before him. The mysterious thing about this is that neither Kankuro nor Temari inherited the ability. So, what’s going on?
Well, it is stated that jinchūriki are usually related to the Kage of their village, to give them a strong connection and against treason. But what if that’s not all? Maybe some of the others realized the connection or at least had a hunch. But, you know, without any knowledge on sealing they couldn’t do anything about it. Or they tried and it didn’t end well. Remember how it’s stated multiple times that the villages had trouble with the Tailed Beasts getting out? Well, if they had a secure way of sealing them, which they all did cause Naruto does talk to each of the others in Purgatory, why would they keep getting out? They must have been trying to change the seals.
Remember, Kumo does try to kidnap Kushina because she is an Uzumaki. But why? What do the Uzumaki do best? Sealing. Also, what does Kumo lack the most? Kekkei Genkai.
The thing is, weakening the seal so the person can gain something, shouldn’t be that hard right? But, it is stated that the people viewed the Tailed Beasts as having a strong pull on the minds of the jinchūriki, so what if they were trying to create a seal that brought the jinchūriki close enough, physically, to gain an ability but not the mind?
The Tailed Beasts all claim the people of the Shinobi World are selfish and power hungry, well what’s more power hungry than trying to take the Tailed Beasts’ body while shutting out the mind? Think about it, Tailed Beasts can die, physically. The Three Tails, Isobu, dies with Nohara Rin and spends years reconstructing itself from surrounding chakra. It’s mind had to still be there for it’s body to build around, but it couldn’t have been a painless situation. What if, like that the people wanted to separate the Tailed Beasts? Body gone but the mind still trying to rebuild. That sounds agonizing. The only one who came close was Minato, and he separated the Soul, and while I can’t say anything on how that must feel like, I can say that the sealing itself had very much hurt Kurama, the Nine Tails. So much so he tried to break out of the strongest natural sealing and kill a baby.
So, why don’t Temari and Kankuro have the Kekkei Genkai? Well, what if it’s the sealing, too? Gaara’s may be the worst, making him the closest, but it isn’t Kaguya and the 10 Tails, after eating it’s only fruit. It’s a common thread though. Kurotsuchi has Lava Release but not Onoki’s Dust Release. Hashirama is the only one with Wood Release.
What if it’s the fact that none of the Tailed Beasts alone are strong enough to alter the jinchūriki’s DNA past superficial. The only Kekkei Genkai with a strong enough hereditary chain are the ones that come from Kaguya, and even then it's said to be every other child. Remember, not every Uchiha had the Sharingan, and even less the Mangekyo. Not every Kaguya had the Shikotsumyaku. The only one with a continues chain was the Hyuuga. And the Hyuuga, as bad as it may be, are very strongly hinted to be inbred.
I don’t know how to end this, or what it could mean, but it’s all very interesting to see.
