#bijuu

I know that Boruto is something of a swear word around these parts but on some choice occasions I like to play around with the retcon worldbuilding implications, so hear me out

for those of you who refuse to keep up with Boruto (a choice I respect), around the end of part 1 Kurama uses up all his life force to beat a bad guy and die, and a bit later Naruto gets sealed off and out of the pictures. Then, in part 2, Kurama respawns directly into Himawari, conveniently giving her a jinchuriki power up mid-fight.

(Boruto: Two Blue Vortex, chapter 10)

This sounds like BS for anyone who knows anything about how jinchuriki work—what do you mean the biju spawned right into her belly, no sealing involved??

Then the concept is further developed in chapter 25:

The gist of it is that 1) Kurama spawned right into Himawari cuz she have exceptional compatibility with his chakra, supposedly more so than even Naruto, because of her bloodline 2) Himawari is not really a jinchuriki, she's actually closer to becoming a biju-like chakra beast herself.

Here, I'm done talking about the Boruto manga, pinky promise.

So the interesting idea is that jinchuriki ancestry has an impact of some sort on a bloodline, And even more if you have several jinchuriki of the same biju—so we get a greater compatibility to said biju, and something akin to a kekei genkai.

The bloodline descended from Uzumaki Kushina is proof of concept.

Naruto’s iconic Fox whisker marks are obviously a Kyûbi thing —they react and widen when the Fox chakra is leaking— but he didn’t gain them from becoming a jinchuriki. Note how neither Kushina nor Mito have those! Naruto was actually born with the whisker marks, a trait we can reasonably infer is due to having a Kyûbi jinchuriki mother.

So being the son of a Kyûbi jinchuriki makes Naruto even more compatible to be in turn a Kyubi jinchuriki, and the face marks are just a physical proof of it.

The Boruto generation confirms it, with both of Naruto’s children having the whiskers (and Himawari’s canon crazy compatibility with Kurama). The only counterintuitive thing is that Boruto and Hima have weaker fox trait than Naruto (2 whiskers instead of 3), altho they have TWO generations of Kyubi jinchuriki in a row in their direct parentage, and their father Naruto is supposedly a much more perfect jinchuriki than Kushina was. I have two possible answers for that: either the Hyuga bloodline strongly balance it out (but Kurama’s words to Himawari seem to hint to the contrary), or their traits are weaker because the jinchuriki bloodline is on their father’s side instead of their mother’s —> they didn’t stew in Kyubi chakra for the whole pregnancy.

From all that I conclude that repeatedly having a specific Biju’s jinchuriki in a bloodline make said biju’s power slowly seep into the bloodline. That entices both a stronger natural compatibility to the Biju among that family line, and a kekei genkai based on that Biju’s own powers.

Kurama doesn’t have any fun elemental release to play with tho, only his fox form and an indecent amount of chakra.

A much more interesting example to poke at would be whatever the fuck is going on in Suna between Shukaku and the Kazekage clan, which I do here :3