Maybe Jiraiya. Since Jiraiya was Naruto's mentor and taught him a lot of things. He might have some knowledge about summoning kami and pass it on to Naruto.
Well, it could make the plot more complex. Naruto's new ability might give him an edge in battles. For example, if he summons kami during a fight with a powerful enemy like Sasuke, it could turn the tide. Kami might have special powers that Naruto can use to his advantage, like some sort of super - healing or powerful attack that was previously unavailable to him.
Maybe it's a completely new and unknown kami. A kami created specifically for this fanfiction. This kami could have unique powers and a different view of the ninja world compared to the existing characters in Naruto. It would add a fresh and exciting element to the story.
Maybe it's an existing character from Naruto who has been elevated to Kami status. For example, Tsunade could be turned into a Kami, and Naruto's relationship with her could be a very different dynamic from their previous ninja - leader relationship. Or it could be Kaguya, who was already a very powerful being, and in this fanfiction, she reforms and becomes a Kami and Naruto's wife.
In fanfiction, the 'kami' could be an original deity created by the author. This new 'kami' could have its own motives and reasons for giving a gift to Naruto. Maybe it's a kami that has been observing Naruto's journey and decides to interfere to help him achieve a greater purpose. It could be a kami associated with nature, like a kami of the wind or the fire, and the gift could be related to that element.
In some Naruto fanfictions, it's possible for Naruto to summon snakes. Fanfiction often takes creative liberties, so writers might give Naruto this ability for the sake of an interesting plot twist or a new power - up. It allows for different storylines to develop, like Naruto using snake - based jutsus or having a connection to snake - related elements in the Naruto universe that he doesn't have in the original series.
It could be fire - breathing dragons. Given Naruto's own energetic and passionate nature, fire - breathing dragons would be a fitting match. They could add a new level of destructive power to his arsenal.
Sure. Fanfiction gives a lot of creative freedom. Some fanfic authors might come up with special circumstances or new abilities that enable Naruto to summon the Kyuubi. Maybe he discovers a hidden jutsu or makes a pact in the fan - made - up world of the story. This can make for really interesting reads as it twists the original Naruto story in unexpected ways.
Perhaps it could be a female version of an existing kami from Naruto lore. For instance, a female counterpart of the Sage of Six Paths. She would have vast knowledge and power, and her training of Naruto would be a way to pass on that ancient wisdom and strength.
Many 'kami naruto fanfiction' pieces tend to blend the spiritual elements of Kami with Naruto's more physical and combat - oriented world. They might explore how Kami's existence affects the balance of power in the ninja villages. Also, these fanfictions sometimes create new relationships between Kami and other characters in the Naruto universe, like Kami having a special bond with Kakashi or Sasuke in some stories.