The Hidden Leaf Village would be in deep mourning. Naruto is a hero to them, and his loss would be felt throughout the village. The villagers would feel a great sense of insecurity as Naruto was one of their main protectors. The morale of the ninja in the village would be low, but it could also lead to a new generation being inspired to become stronger in Naruto's memory.
The village might experience a huge boost in morale. Naruto killing Pain would be seen as a major victory, and the villagers would feel safer. They would look at Naruto as an even greater hero, which could lead to more trust and unity within the village.
One way it could happen is if there's a dark force that is specifically targeting Kurma to gain ultimate power. Naruto, being the selfless hero he is, steps in. He might use some sort of forbidden jutsu that binds his life to Kurma's safety. As he sacrifices himself, his body could turn into pure energy that surrounds and shields Kurma. This would leave the ninja world in shock. People would remember Naruto as a true hero, and Kurma would be left with a new sense of purpose, perhaps to carry on Naruto's will and protect the world in his stead.
The most obvious change would be in the village's security. Naruto, as a ruler, would no doubt strengthen the village's defenses. He could form new alliances with other ninja villages, creating a united front against any potential threats. In terms of internal affairs, he might create more opportunities for the lower - class ninjas. Instead of only the powerful clans getting all the good missions, he could ensure a more equal distribution of tasks, which would improve the overall morale of the ninja population.
It could cause a great sense of loss and mourning. The village might lose its sense of security as Naruto was a symbol of protection. His death could lead to a power struggle as different factions try to fill the void he left.
The unexpected ally might be a character from a different village, like Gaara from the Sand Village. Gaara has a deep respect for Naruto and has changed his ways after his encounter with Naruto. In this fanfiction, Gaara could come to the aid of the Hidden Leaf Village because he believes that the safety of all villages is interconnected. His unique sand - based powers would add a different dimension to the fight to save the Hidden Leaf Village.
Well, the Kyuubi itself would probably be changed. Naruto had a deep bond with it. His sacrifice might make the Kyuubi more empathetic towards humans. It could even decide to protect the village in Naruto's memory. On the other hand, the next generation of ninja would grow up without Naruto as their inspiration. They would have to find new heroes to look up to, and the stories of Naruto's deeds would become more like legends, with a bittersweet feeling of what could have been if he had lived.
A cool plot twist could be that the Hidden Leaf Village is not actually in danger in the way it seems. It's all a big illusion created by a powerful enemy to make Naruto use up all his strength. Once Naruto realizes this, he has to find a way to break the illusion for everyone in the village and then face the real enemy, who is waiting for Naruto to be weakened.
Their relationship could have a positive impact. Naruto is already a respected figure in the village. His marriage to Anko and Kurenai would bring together different aspects of the village's shinobi community. Anko has her own group of friends and connections related to her past work and training, while Kurenai is well - respected among the genjutsu users. This union could lead to better cooperation between different shinobi groups, and it might also inspire other shinobi to be more open - minded about relationships that are not the norm in the village.
On a more emotional level, their relationship could inspire the villagers. Naruto has always been a symbol of hope and perseverance. If he is in love with Hana, it shows that love can happen in the most unexpected ways. This could give the villagers, especially the younger ones, a more positive outlook on relationships and life in general, which in turn would create a more harmonious and productive village environment.
Their marriage could strengthen the village in terms of unity. Naruto is a well - respected hero in the village, and Kurenai is a skilled ninja. Together, they could inspire the younger generation. For example, young ninjas might see their relationship and strive to be like them, both in terms of their ninja skills and their relationship values.