Leitor_Onisciente
I'm just here to read and judge your stories. Don't take me seriously đșđ§đ·
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Who ensures that the plot is fixed? He doesn't even know how he was transmigrated, he may simply be manipulated, expecting the plot to follow the same as the canon is silly. It's much smarter to manipulate him to your advantage, letting Hiruzen die would just be stupid.
Either way, you don't need the addition of Minato to do that. Fujin has been interacting with Hiruzen for a long time, if he doesn't save him it will not only be a scoundrel of the character, but also stupidity because Hiruzen is his main supporter
The risk of this jutsu is not worth it even with weaker opponents, as the original has already shown several times that an immensely powerful ninja can be killed by a much weaker one if he is careless. It would be best to create sub-techniques from this jutsu and start developing yin knowledge
All of them in the anime and manga look like just giant pokemon that possess a much higher brute force than normal ones, everything they represent is ignored. In the movies you can see a Celebi going back in time a bit, but that's about it.
Example: Dialga is a time pokemon, so its power is to control time. But this is rarely shown in the original or never shown at all. And in games, all he has is a Hyper Beam called the roar of time. Darkrai controls dreams and nightmares, but everything he does is no different from anything a ghost or dark pokemon does.
I said I touched on this subject, I don't think it would be a problem for you to create your own kekkei genkai, after all it's a fanfic. I believe that people will accept it if the creation process makes sense. It's no different than creating the original jutsus themselves.