For Kakashi, it would be like losing a student all over again. He had trained Naruto and watched him grow. He would be proud of Naruto's selfless act but also extremely sad. The other villagers who had come to accept Naruto as a hero would be in shock. There would be mourning throughout the village. Naruto's friends would hold onto the memories they had with him. They might start initiatives in the village in Naruto's name, like training programs for young ninja to pass on his spirit. But they would always carry the pain of his sacrifice.
His friends would initially be in disbelief. Naruto was always so full of life and determination. They would probably search for a way to bring him back, especially those with strong ninjutsu abilities. Hinata would be heartbroken. She had deep feelings for Naruto. She might even try to take on some of Naruto's responsibilities in the village to keep his memory alive. His friends would also come together to support each other, but there would always be an empty space where Naruto used to be.
Sakura would be devastated. She had known Naruto for a long time and had come to care for him deeply. She might feel guilty for not being able to stop him. Sasuke would also be greatly affected. He and Naruto had a complex relationship. He might regret not being there for Naruto when he made the sacrifice. His friends from the village like Shikamaru and Choji would feel a great sense of loss. They would remember Naruto's always - positive attitude and feel that the village had lost a great light.
His friends' reactions would be intense. Kakashi, as Naruto's teacher, would feel responsible. He would gather as much information as he could about the kidnapping. His friends from Team 7 and the other ninja in the village would band together. They would know that Naruto is strong, but also that the Kyuubi is a powerful and dangerous force. They would not rest until they found Naruto. Some might be angry at the Kyuubi, while others would be more focused on just getting Naruto back safely. They might also try to find ways to communicate with the Kyuubi, if possible, to negotiate for Naruto's release.
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.
Naruto might initially be shocked and angry. He has always considered the Kyuubi as an enemy within him, and now being kidnapped by it is the worst - case scenario for him. He could try to fight back immediately, using whatever little chakra he can muster without relying on the Kyuubi's power.
As for Sasuke, he might view Naruto in a new light. He has always been interested in power, and seeing Naruto gain such a powerful connection could make him more intrigued or even more competitive. However, he might also be concerned about the implications for the village and the ninja world as a whole.
Well, Kakashi would likely be very cautious. He would be concerned about the implications of Naruto being with the fem Kyuubi. He would want to make sure that Naruto was not being manipulated in any way. He might keep a close eye on their relationship and offer advice to Naruto when he thought it was necessary. As for the other Konoha 11 members, some might be more accepting. They might see it as Naruto's personal choice and be happy for him if they saw that the relationship was a positive one. But there would also be those who would be hesitant, especially if they thought the fem Kyuubi could pose a threat to the village in the future.
The characters' reactions would be complex. For instance, Iruka Sensei, who was like a father figure to Naruto, would be inconsolable. He has watched Naruto grow from a troublemaker to a hero, and this sacrifice would be too much to bear. Shikamaru, being Naruto's friend, would feel a mix of admiration and sadness. Admiration for Naruto's selfless act but sad that he's gone. The kids in the village who looked up to Naruto would be inspired in a way. They would want to be like Naruto and protect the things they love, even if it means sacrificing themselves.
Hinata would be completely devastated. She has always been deeply in love with Naruto, and his sacrifice would leave her heartbroken. She would still be strong for Boruto, though, and try to support him in any way she could.
Some fans are deeply moved. They might cry while reading it because Naruto has been such an important and beloved character throughout the series. His sacrifice represents the ultimate act of heroism, and fans who have grown attached to him over the years would feel a strong emotional connection to such a story.
Obviously, Naruto and Kyuubi are the main characters. Naruto, the protagonist of the Naruto series, has a special connection with Kyuubi, the nine - tailed fox. In this fanfiction, their relationship is explored further, and they become friends.
In some fanfictions, Naruto might start by trying to understand the Kyuubi's pain. He could use his own experiences of being an outcast in the village to empathize. As he shows this understanding, the Kyuubi begins to see him as different from the other humans who just fear it. They might start having conversations in Naruto's mindscape, gradually building a bond of mutual respect.