Perhaps it delves into Naruto's connection with the Nine - Tails in a more profound way due to his hidden potential. Maybe he can communicate with the Nine - Tails on a spiritual level and gain unique powers from it. This could change the course of battles and his relationships with other characters.
One interesting plot could be that Naruto discovers his hidden bloodline gives him the ability to control time in small increments. This allows him to dodge attacks more easily and plan his counter - attacks more effectively.
It could be a rogue ninja from a forgotten clan who is jealous of Naruto's new - found power from his hidden bloodline. This antagonist might try to steal Naruto's bloodline ability for himself.
The fanfiction might introduce new characters or storylines that are directly related to Naruto's hidden potential. In the original, we follow a set path, but here, new villains could emerge that are specifically interested in Naruto's hidden power, or new allies could come forward to help him unlock it. This can add a whole new layer of complexity and excitement to the Naruto universe.
In some 'naruto multiwives fanfic', Hinata is often a potential wife for Naruto. Given their relationship in the original series, it's easy to imagine her as one of his wives. Sakura could also be a candidate. Even though her feelings were mainly towards Sasuke in the original, in fanfic, things can be different. And then there's Ino. She has her own charm and abilities, and could be one of Naruto's wives in the fanfic world.
Kakashi could still be an important ally even though Naruto has become a Jounin. Kakashi has a wealth of experience and knowledge that Naruto could still learn from. He could offer advice and assistance when Naruto faces tough challenges in his new role.
Well, in some fanfic concepts, Kurama might release Naruto's potential by sharing its own chakra in a more direct and unrestricted way. Maybe it could be like a full-on infusion of Kurama's power, which then unlocks hidden abilities within Naruto that were previously dormant due to Naruto's own self - imposed mental blocks or lack of proper training to handle such power.
Ruby could be a potential ally. She is brave and has a strong sense of justice, just like Naruto. They could team up and use their unique abilities to fight against the Grimm. Another one could be Jaune. He is a bit of an underdog, and Naruto has a soft spot for those kinds of characters. He could help Jaune improve his skills.
His hidden powers might be the ability to control all five basic nature types without any training. In the original story, Naruto had to work hard to master different nature types. But in a fanfiction, it could be that he has this innate ability which was hidden all along. This would make him extremely powerful and feared by his enemies.