If Naruto is trained by Shao Kahn in fanfiction, it would be a wild mix of two different fictional universes. Naruto, who is used to the shinobi way of life, would be exposed to Shao Kahn's world of Outworld. Shao Kahn could introduce Naruto to more aggressive and perhaps darker forms of combat. This might change Naruto's personality a bit, making him more of a no - nonsense fighter. Also, Naruto might learn some new ways to enhance his physical strength, which could be a great addition to his existing skills.
His physical abilities would likely improve a great deal. Shao Kahn could teach Naruto more about brute force and raw power, enhancing Naruto's already impressive strength. His combat skills would also become more diverse, incorporating some of Shao Kahn's signature moves.
Well, Naruto would probably gain some really unique magical abilities. Fairy Tail mages are known for their diverse magic, and Naruto could combine his chakra skills with something like Fire Magic or Celestial Magic. He might become even more powerful in combat, with new ways to attack and defend.
Naruto would gain better combat awareness. Kurama's experience in battles can be passed on to Naruto. He'll be able to read his opponents better, know when to attack and when to defend. This will make him a more formidable opponent in combat situations.
Yes, there are likely to be such fanfictions out there. The idea of Naruto being trained by Ichigo combines two very popular anime characters from different series. Fanfiction writers often come up with creative crossovers like this. You can try searching on major fanfiction platforms to find specific works.
One possibility in this fanfiction could be that Naruto gains new and unique combat skills. Monkey D. Dragon is known for his revolutionary ideas and powerful abilities in the 'One Piece' world. Under his training, Naruto might learn different ways of strategizing and approaching battles, perhaps incorporating some of the more unorthodox fighting styles from the 'One Piece' universe. This could lead to Naruto becoming even more formidable, not just in terms of his ninjutsu, but also in his ability to lead and inspire others in a different way, much like how Dragon has an impact on the 'One Piece' world.
Maybe Muu is a long - lost member of a powerful clan that has some special connection to Naruto's Uzumaki heritage. So he takes it upon himself to train Naruto to help him reach his full potential and also to preserve some ancient techniques or secrets related to their clans.
I'm not sure who the specific author of that fanfiction is. There are so many fanfiction writers out there that it's difficult to determine without more research.