Shikamaru, being the more laid - back yet perceptive friend, would probably think that Naruto is being a bit rash. But he would also know that once Naruto has made up his mind, there's no changing it. So he would just sigh and say something like 'Well, do what you gotta do, Naruto' and keep an eye on things in the Elemental Nations in Naruto's absence.
Sasuke would likely understand Naruto's motives better than most. He himself has had his own reasons for leaving in the past. He might give Naruto some advice based on his own experiences, like how to survive in unknown lands. But at the same time, he would also be a bit envious of Naruto's new adventure.
One possible reason could be to search for a new power source. Maybe in the fanfic, the powers within the Elemental Nations have become stagnant for him, and he believes there are greater sources of power elsewhere.
Shikamaru, being the laid - back yet perceptive friend, would probably think that Naruto has a plan. He would be concerned but also understand that Naruto is not one to make hasty decisions without a good reason. He might keep an eye on Naruto's family in his absence and hope that Naruto will return safely one day.
One reason could be to seek new challenges. In some fanfictions, Naruto might feel that he has accomplished all he can in the Elemental Nations. He has protected his home, become Hokage, and now he wants to explore the wider ninja world or even other realms that are unknown to the Elemental Nations.
Shikamaru, being the smart and observant one, would analyze the situation thoroughly. He would probably warn Naruto about the potential political pitfalls and how to navigate them. He might also offer some strategic advice on how to handle the relationship aspect, like how to communicate effectively with his new partner in the political marriage so that Naruto doesn't get caught up in unnecessary drama or power plays.
Well, Naruto's friends' reactions would depend on their personalities. Sasuke, if he's around, might seem indifferent on the surface but secretly think that Naruto is being an idiot as usual. Hinata might be a bit shy about the whole situation, but also happy for Naruto if she senses that he really likes Temari. And Lee would probably be super excited and start shouting words of encouragement to Naruto, saying things like 'Go for it, Naruto! Show your youthfulness in this pursuit of love!'
Sakura might be very worried. She's a medical ninja, so she would be concerned about the potential harm Naruto could be doing to himself. She'd probably try to stop him or at least monitor his experiments closely. Sasuke, on the other hand, might be more understanding in a way. He knows what it's like to push oneself for power, but he might also be a bit skeptical and warn Naruto about the risks.
Some of Naruto's friends could be really enthusiastic about his new friendship with Tora. Choji might offer Tora some of his favorite snacks. Ino could try to dress Tora up in cute little outfits. However, Neji might be a bit skeptical at first, thinking that Tora could be a distraction for Naruto. But as he sees the positive impact on Naruto, he would come around.
Sakura might be a bit hesitant at first. She's always seen Naruto as the go - lucky, friendly guy. But she would eventually support him if she saw that his intentions were good and that the empire was built on positive values like justice and equality. Sasuke, on the other hand, would be more cynical. He might suspect Naruto's motives initially, thinking it could lead to dictatorship. But after seeing Naruto's actions, he could become one of his closest advisors, using his own experiences to help Naruto avoid making mistakes. Shikamaru would be involved in the strategic planning. He would be both excited and worried about the whole idea, constantly thinking about the long - term consequences.
Sakura would probably be a bit skeptical at first. She'd worry about how Naruto could take care of another person when he's always so busy with his ninja duties. But once she sees how much Koneko needs a home and how Naruto is committed, she'd warm up to the idea. Sasuke might not show much emotion on the surface, but secretly he'd respect Naruto's decision. Shikamaru would think it's a troublesome situation but would also see the good in Naruto giving Koneko a chance at a better life.
Some of his friends might feel betrayed. They may think that Naruto has abandoned them, especially if he leaves without a proper explanation. However, those who understand him better would know that he must have a good reason. For example, Sakura might initially be angry but then realize that Naruto is doing what he thinks is best for the greater good.