One possible consequence could be that Konoha would enter a period of deep mourning. Naruto is a beloved figure, and his sacrifice would leave a huge void. The villagers might be inspired by his selfless act to strive for a more peaceful and united Konoha. His friends, like Sasuke, might be filled with a new sense of purpose, perhaps to carry on Naruto's ideals in a more aggressive way to ensure his sacrifice wasn't in vain.
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.
Perhaps in the fanfiction, Naruto gives his life energy to Boruto to save him from a deadly curse. Boruto then has to deal with the newfound power within him, which is a mix of his own and his father's. He may struggle to control it at first but eventually learns to use it for good. This could also lead to a rift between Boruto and some of the villagers who blame him for Naruto's death.
One possible plot could be that in a final battle against an extremely powerful enemy, Naruto realizes that the only way to save Hinata and the entire village is by using a forbidden jutsu that will cost him his life. He makes this sacrifice with a smile on his face, knowing that Hinata and the others will be safe. Hinata is heartbroken but also determined to carry on Naruto's legacy of protecting the village.
The village would be in shock. People would be in disbelief that Naruto, who has always been a symbol of hope, is gone. There would be immediate grief, with many villagers crying in the streets. Some might even blame the village leaders for not being able to prevent his sacrifice.
Well, it could be that Naruto sacrifices himself to seal away a dark and ancient curse that is threatening to destroy not only the ninja world but all of existence. He realizes that his unique connection to the tailed beasts and his strong willpower make him the only one who can perform this self - sacrificing sealing jutsu. So, he says his goodbyes to his friends, family, and the village he loves and gives up his life to save everyone.
One possible plot development could be that Sasuke is initially in a situation where he is facing an enemy he can't defeat alone. Naruto steps in and gives his life to save Sasuke. This would lead to Sasuke being filled with guilt and a new sense of purpose. He might vow to carry on Naruto's will, perhaps trying to bring peace to the ninja world in Naruto's name. Sasuke could also start to question his own actions that led to Naruto having to sacrifice himself, and he may become more empathetic towards others as a result.
One possible outcome could be that the Hidden Leaf Village enters a period of great mourning. Naruto is a hero to them, and his sacrifice would leave a huge void. His friends like Sasuke might be filled with regret for not being able to stop him. They could also be inspired by his selfless act and strive to protect the village even more fiercely in his memory. Kurama, on the other hand, might be filled with a sense of guilt and a newfound determination to protect the village in Naruto's absence.
In the fanfiction, Naruto might sacrifice himself for Sakura in a more selfless act of love. For example, if Sakura is afflicted by a deadly curse and the only way to break it is for someone to transfer all their life energy to her. Naruto, being the selfless hero he is, decides to do it without hesitation. This would then explore how the other characters react to his loss and how Sakura copes with living on with Naruto's gift.
In fanfiction, Naruto sacrificing himself for Obito could be a very emotional and dramatic concept. It might show Naruto's ultimate selflessness, believing that Obito is worth saving at the cost of his own life. This could be due to Naruto seeing the good in Obito that others might not, like the part of Obito that was once a kind - hearted shinobi.
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.