Perhaps Hagoromo's brother was wrongly accused of something in the past and sealed away. Naruto discovers his existence and frees him. In return, the brother tells Naruto the true history of the ninja world, including secrets about the origin of chakra that no one else knows. This knowledge helps Naruto to bring about a new era of peace and understanding among all the ninja clans.
One possible plot could be that Naruto discovers he is a reincarnation of Hagoromo. This leads to him having to deal with newfound powers and responsibilities. He might have to face an ancient evil that only he, as Hagoromo's reincarnation, can defeat.
In some fanfictions, it might be possible for Naruto to be depicted as Hagoromo's brother, but this is completely a creative and non - canonical concept. Fanfiction allows for such wild and imaginative ideas to explore different relationships and storylines.
In such a fanfiction, perhaps Naruto could be disillusioned with Hagoromo's teachings or power. Maybe he discovers some dark secrets about Hagoromo that lead him to abandon the connection. For example, if Hagoromo's actions in the past were not as noble as they seemed, Naruto, with his strong sense of justice, might decide to part ways.
Well, it could be about the main character having special powers inherited from Hagoromo. Maybe they have to face new threats that only someone with Hagoromo's blood can handle.
Well, in fanfiction, if Naruto is the brother of Hagoromo, it would have far - reaching implications. Firstly, Naruto's status would be elevated to an almost god - like level. His every action would be seen in the context of his relation to Hagoromo. His journey as a ninja would likely be different. He might not face as much opposition or might be expected to fulfill different prophecies. His relationship with Sasuke could also take on a new dimension. Maybe Sasuke would see Naruto in a different light, either as a more powerful rival or as someone who he needs to follow or support more. And in terms of the plot, the story could explore new conflicts, like those arising from Naruto's new - found status and how it affects the balance of power in the ninja world.
Well, in a fanfiction, it's possible. One way to write it could be by creating a whole new backstory for Naruto. Maybe there was some sort of time - travel or alternate dimension thing. Naruto could have been sent back in time and ended up as Hagoromo's brother. It would be really interesting to explore how Naruto's modern - day values and skills would interact with the ancient world Hagoromo was from.
One interesting plot twist could be that Naruto actually has a hidden power that is the key to Hagoromo's own power development. Maybe Hagoromo has been struggling with something in his power growth, and Naruto's presence unlocks it. Another could be that Naruto is from the future, and his knowledge of future events causes a huge shift in the way things are supposed to happen in Hagoromo's time.
Perhaps it could be another entity related to Hagoromo. If Naruto abandons Hagoromo, there might be a counterpart or a follower of Hagoromo who sees Naruto as a threat or a traitor. This person could then become the main antagonist, trying to either bring Naruto back to Hagoromo's side or simply eliminate him.
A main plotline could be Naruto being trained in ancient ninja arts that Hagoromo knew. These arts could be lost to the modern ninja world. So, Naruto would have an edge in battles. For example, he could learn some unique sealing techniques that were forgotten over time. This would make him a target for those who want to use his skills for their own gain. Another aspect could be Naruto's relationship with the other villages. With Hagoromo's influence, he might try to establish a more equal and peaceful co - existence among all the villages from a very young age. He could also be involved in uncovering secrets about the origin of the ninja world that Hagoromo knew but were long forgotten.
In such a fanfiction, Naruto might quickly master powerful jutsus. Hagoromo could teach him the secrets of chakra that no one else knows. Naruto would likely become extremely powerful, maybe even unlocking new forms of Sage Mode or a unique power related to Hagoromo's own abilities.