One challenge could be getting enough resources. Rebuilding an entire place like the Whirlpool requires a lot of materials, and they might struggle to find or afford them. Another is dealing with the opinions of other ninja villages. Some villages might not be supportive of the rebuilding for various reasons.
Politics within their own village could be a problem. Some people in Konoha might not see the value in rebuilding the Whirlpool and would rather resources be focused on Konoha. And on a personal level, Naruto and Hinata have to balance their family life with this huge project. They might not have as much time for their children if they are fully dedicated to the rebuilding.
They could face challenges related to manpower. Even with Naruto's shadow clones, they need skilled workers. Finding people who are willing to help and have the right skills can be difficult. Also, there might be natural disasters or geographical problems in the area of the Whirlpool that they have to overcome, like unstable ground or frequent storms.
One possible plot could be that Naruto and Hinata decide to rebuild the Whirlpool after realizing its historical and cultural significance. They start by gathering a team of volunteers, including some of their old friends. Along the way, they face challenges like finding the right resources and dealing with political opposition. But with their determination and love for each other, they keep going.
In harem fanfiction, Naruto could face the challenge of dealing with different cultural backgrounds of his partners. Since they come from various places, integrating their ideas and values into the new clan structure might be a headache. Moreover, resources are always an issue. Rebuilding a clan requires a lot of money, manpower, and materials. He has to figure out how to gather these resources while also maintaining his relationships in the harem. For example, some of his partners may have their own financial or family obligations that could either help or hinder his clan - rebuilding efforts.
Naruto would likely struggle with Hinata's shyness. He is a very outgoing person, and suddenly being in a body that is naturally more reserved could be difficult. For instance, when interacting with other characters, he might accidentally come across as too forward or too quiet, which could lead to misunderstandings. Also, Naruto would have to deal with Hinata's personal relationships. Her friends and family know her in a certain way, and any changes in behavior due to Naruto's possession could cause concern or confusion among them.
One big challenge would be finding skilled ninjas to help him. Ushiogakure might not have a large population to start with. He'd need to either train new ninjas from scratch or convince others to join him. Another issue could be dealing with any existing rivalries or feuds in the area.
The weather could pose a challenge. If they go to a place with unpredictable weather, like a mountain area, they might get caught in a storm. Naruto would try to protect Hinata from the elements, but they could end up lost or having to find shelter in a less - than - ideal place. Also, adjusting to living together in such a close and new way could be difficult for both of them.
One challenge could be cultural differences. Konoha and Suna have different traditions and ways of life. For example, the Hyuga clan has its own strict family rules which might conflict with Suna's more laid - back approach in some aspects. Another challenge is the distance between their villages. Maintaining a relationship while being so far apart for official duties can be tough. Also, their friends and families may have different expectations. Hinata's family might be worried about her moving to Suna, and Gaara's council in Suna may have concerns about a Konoha - native being so close to the Kazekage.
One challenge could be Sasuke's aggression. Since he is in a nightmare state, he might be extremely violent and not recognize Hinata as a friend. Hinata would have to be very careful not to get hurt while still trying to reach out to him.
Perhaps they stumble upon a hidden treasure. But it's guarded by traps and illusions. Naruto's determination and Hinata's perception would be crucial in navigating through the obstacles. They'd share the excitement of the discovery and figure out how to handle the treasure, whether it's something that should be returned to its rightful place or used for a greater good.
One challenge could be finding enough Uzumaki descendants. Since the clan has been through so much, there may be very few left. Another might be dealing with the political implications. Other clans might be jealous or fearful of a resurgent Uzumaki clan.
One challenge would be their different personalities. Hinata is shy and introverted, while Sasuke is brooding and often aloof. Communicating their feelings and needs could be difficult. For example, Hinata might have trouble expressing when she's unhappy with something Sasuke does, and Sasuke may not pick up on her subtle cues.