Naruto himself could be a likely candidate. Given his strength, leadership skills, and his dream of uniting the ninja world, he would make a great 6th Hokage.
Sasuke could also be a candidate in some fanfictions. Despite his past, he has grown and his skills and knowledge could be very useful in leading the Hidden Leaf as the 6th Hokage. He could bring a different perspective to leadership, especially in terms of security and dealing with external threats.
Shikamaru is another possible candidate. He is highly intelligent and has shown great leadership during various missions. His strategic thinking could be invaluable for the role of the 6th Hokage. He could use his intellect to make smart decisions for the village, whether it's in matters of war or in promoting the village's economy and development.
Sasuke could also be a possibility for the 6th Hokage in the fanfic. He has grown stronger over the years and his unique perspective on the ninja world could bring new ideas to the leadership of the Hidden Leaf. He might start off as a controversial choice but prove himself through his actions in protecting the village and making tough decisions.
Obviously, the 5th Hokage herself. Then there would probably be Naruto, as he is a central character in the Naruto universe. Sakura might also be there, as she is one of Naruto's closest friends. And Kakashi could make an appearance, given his importance in the story. Shikamaru, with his intelligence, could also be involved, perhaps as an advisor to the 5th Hokage.
Obviously, Naruto himself is central. His family like Hinata and Boruto would be very likely to be involved. Sasuke is also a key character as Naruto's friend and ally. Kakashi, being Naruto's former teacher, could also play a role. Shikamaru, as Naruto's advisor, would be important in any political or strategic situations. And then there are the other members of the Konoha 11, like Sakura who could be involved in medical support or combat situations if needed.
A group of corrupt politicians within the village itself could be the main antagonists. They might be secretly plotting to undermine Naruto's authority as the 5th Hokage in order to gain more power for themselves. They could be making deals with other villages or ninja groups that are not in the best interest of Konoha, and Naruto has to expose and stop their schemes.
Well, Naruto himself is likely to be there as he is an important part of the Naruto universe. Sakura might also be a common character. Since she has a long - standing relationship with Naruto and other characters in the series. Hinata could also be featured as she has her own connection to Naruto. These characters can be involved in the 'lemon' aspects, like perhaps a love story between the 6th Hokage and one of them.
Under Naruto as the 5th Hokage in fanfiction, the village would experience a cultural shift. Since Naruto values all kinds of people, the village would be more open to different ideas and ways of life. New forms of ninja techniques might be developed as he encourages everyone to explore their potential. Also, the village's defenses would be strengthened not just by physical means but also by the strong bonds between the villagers, which Naruto would foster.
In fanfiction, Naruto's rule as the 5th Hokage might be full of positive changes. He would probably focus on improving relationships between the different ninja clans in the village. He'd also likely invest a lot in training the new generation of ninjas, using his own experiences to teach them about perseverance and the importance of friendship.
Sasuke could also be a main character. Even though he has his own path, his relationship with Naruto is so deep that he would surely be involved in Naruto's life as the Hokage. He might offer his support or advice when Naruto faces difficulties. And Kakashi, as Naruto's former teacher and the previous Hokage, could also be a key figure in the story.
Naruto's son, Boruto, might also be a possibility. He has been growing up in the shadow of his father but has his own unique skills and a different perspective on the ninja world, which could make him a great 8th Hokage.
One great 'Naruto 4th Hokage Fanfiction' is 'The Fourth's Legacy'. It delves deep into Minato's early days as a ninja, his training, and how he came to develop his signature jutsus. The story has a great plot and really brings out the character of Minato.