He would probably become extremely powerful. The gods could teach him unique jutsus and skills that no one else in the Naruto world knows. His physical and mental strength would likely reach new heights.
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.
In the 'Harry Potter trained by Gods fanfiction', it's possible that the gods choose Harry because they see his potential to bring balance to the magical world. They train him not only in magic but also in virtues like courage and wisdom. Harry could then use this training to inspire other wizards and witches to fight against evil. He might even introduce new forms of magic governance based on the principles he learned from the gods, which could change the whole structure of the wizarding world.
Well, in fanfiction, Naruto being trained in different ways can bring more variety to his character. He can be trained in unique fighting styles or gain knowledge that was not available in the original story. This can make him more versatile in different storylines. Also, it can attract more readers who are looking for new and exciting takes on Naruto's development.
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.
It could be Zeus. He is a powerful god and might see Harry as a worthy candidate for training. He could teach Harry about leadership and power control.