It could be an old, retired ninja who lives on the outskirts of the village. This person has seen the hardships Naruto faces and decides to take him under their wing.
Maybe it's a wandering shinobi who passes through the village. He senses Naruto's strong will and decides to give him some basic training before moving on with his journey.
In some versions of the fanfiction, it could be a spirit or a spectral figure. This entity is tied to the village's past and sees Naruto as the key to its future, so it starts training him in secret before the academy.
It could be an unknown ninja from a far - off village who specializes in Storm Release. This ninja might have heard of Naruto's potential and decided to train him.
Naruto might be more confident in his relationships. Since he has received training from Itachi, he would be more self - assured. He might not be as eager to prove himself in a brash way as in the original story, which could lead to better relationships with his classmates. For example, he wouldn't constantly challenge Sasuke in a show - of - strength manner.
Perhaps a fallen god who, despite losing his status, still has the knowledge of how to train a God of Destruction. This character could have his own motives for training Naruto, like regaining his former glory through Naruto's success.
Maybe it's a member of a long - lost ninja clan. This clan member could have some special skills and knowledge that they want to pass on to Naruto. They choose to train him in secret to protect their clan's secrets from falling into the wrong hands.
In such a fanfiction, one possible plot could be Naruto training in secret. Maybe he discovers an old, hidden training ground in the village. He starts practicing basic ninja skills like shuriken throwing and tree climbing on his own. This early training could give him an edge when he finally enters the academy, making him stand out among his peers.
The plot could involve Kurama teaching Naruto how to use his own chakra more efficiently. Since Kurama is a powerful source of chakra, he can guide Naruto on how to tap into his inner strength. Maybe Naruto starts to show extraordinary abilities in front of the villagers even before the academy, which causes both fear and admiration. This early training could also lead to Naruto having a different attitude towards his studies at the academy as he already has some skills.
It could be Kakashi. He has a lot of knowledge and skills that he could pass on to Naruto more intensively. Maybe he takes Naruto on a long - term mission where they train on the go. Kakashi could focus on improving Naruto's Sharingan - like observational skills and help him develop new strategies for combat.
His view of the world would expand. Naruto, who was mainly focused on the ninja world, would now be exposed to the magical world through Merlin. This would make him more open - minded and understanding of different cultures and powers. He may also start to use his newfound knowledge to try and bring peace not just between ninja villages, but also between the ninja world and the magical realm Merlin comes from.
His understanding of the ninja world would expand. He might become more cautious and calculating in battles, as Kaguya's training could expose him to different strategies. Also, he could develop a more solemn side to his personality, considering Kaguya's own complex nature and the heavy knowledge she might share.
His understanding of the ninja way would expand. The Sandaime could share his own experiences and wisdom, making Naruto more in - tune with the deeper meaning of being a ninja. He might also become more confident, knowing he has the backing and training of such an important figure.