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.
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 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.
Naruto himself would be an obvious choice. He has the strength, the popularity among the villagers, and the experience from all his adventures. He would bring a new energy and a more inclusive approach to leading the village.
Another scenario could involve Minato teaching Naruto some new jutsu. Since Minato was a very powerful ninja, he could pass on some of his secret techniques to Naruto. This would not only strengthen Naruto further but also be a great bonding moment between father and son. They could also talk about the past, like how Minato sacrificed himself for the village and Naruto could share his own struggles growing up without his father.
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.
There could be a storyline where Naruto, as a fan of the 4th Hokage, gets to time - travel back to the era of the 4th Hokage. There, he could interact with his father, learn from him directly, and even help him in some of his battles. Or maybe Naruto tries to prove himself worthy of being the 4th Hokage's successor in a more intense and unique way compared to the original story.
One possible plotline could be Naruto using his newfound time - traveling ability to prevent some of the major tragedies in the past. For example, he might try to stop the Uchiha massacre. He could also use his knowledge from the future to help his younger self become stronger faster, perhaps by teaching him some advanced jutsu he learned later in life.
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.
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.
One possible plot could be Naruto dealing with the post - war reconstruction. He might focus on rebuilding the village, strengthening relations with other villages, and also mentoring the new generation of ninjas. For example, he could start new training programs inspired by his own experiences.