The Uzumaki clan bloodline can also be used in fanfics to explore family and heritage. Characters might discover long - lost secrets about their Uzumaki ancestry that change their view of themselves and their place in the ninja world. It could be something as simple as a new jutsu that was forgotten by the clan but is now accessible to the main character because of their Uzumaki blood, or it could be a much deeper connection to a prophecy or an ancient power.
The Uzumaki clan bloodline in fanfics also sometimes has a spiritual aspect. It could be that an Uzumaki character has a special intuition or a connection to the spiritual realm because of their bloodline. This spiritual connection might help them in battles, like sensing an enemy's moves before they happen, or it could lead them to discover ancient and powerful artifacts.
Maybe Naruto proves himself worthy by showing off his powerful jutsu skills that are related to the Uzumaki heritage. He could also use his status as a hero in the village. By winning the trust and respect of the Uzumaki clan members, he gradually takes over the leadership of the clan.
Well, he could start a family with Hinata and have lots of kids, passing on his Uzumaki bloodline. Then, he could encourage his friends who have some Uzumaki connection, like Karin, to also have families and pass on their Uzumaki genes. He could also set up a school or training center in the Uzumaki land, teaching the Uzumaki ways of life and ninjutsu, which would attract orphans or those who want to be part of the Uzumaki clan.
Power discovery. Since the Uzumaki bloodline is powerful, a common theme is Naruto finding out about his hidden powers. For example, he might discover a new form of chakra control or a special jutsu related to his Uzumaki heritage.
Naruto is likely to be the catalyst. He has the influence and the will to bring together the scattered Uzumaki members.
Perhaps Naruto would find ancient Uzumaki artifacts in the fanfic. These artifacts could have powerful abilities. He might have to face off against enemies who also want these artifacts for their own evil purposes. And through his interactions with the Uzumaki clan, he could gain new friends and allies who would stand by him in future battles.
One interesting concept could be exploring an unknown kekkei genkai of the Uzumaki clan that gives them the ability to manipulate time on a small scale. For example, they could slow down time for a brief moment in battle, giving them an edge. Another idea is a kekkei genkai that allows them to communicate with the spirits of their ancestors, gaining wisdom and power from them. Maybe a kekkei genkai that lets them transform into a powerful beast form related to their clan symbol.
Naruto could also offer incentives for Uzumaki to have children. For example, providing better living conditions, education, and protection. He might also use his influence to find suitable partners for the remaining Uzumaki members, both within the village and from other allied villages. This way, they can start new Uzumaki families and gradually increase the clan's numbers.
His friends from Konoha like Sakura and Shikamaru might support him. Sakura could offer her medical skills to help any ailing Uzumaki members, and Shikamaru could use his intelligence to strategize for the clan's growth.
A really interesting 'naruto has uzumaki bloodline fanfic' is 'Naruto: The True Uzumaki'. This fanfic explores the political implications of Naruto having the Uzumaki bloodline. It shows how different villages react to the fact that Naruto has such a powerful and rare bloodline, and how Naruto has to navigate through all the politics while still being true to himself.