Another potential character could be a new, original character created for the fanfic. This character could be a young prodigy ninja with unique abilities that set them apart. They might have been trained in a secret or unorthodox way, and their journey to becoming the youngest Hokage would be full of twists and turns as they prove themselves to the village.
Sasuke could also be a candidate in some fanfics. He has his own set of powerful abilities and a complex personality. A story could be written where he decides to take on the role of Hokage at a young age to bring about change in the village in his own way, perhaps using his Sharingan and new techniques he develops.
Well, in many 'naruto youngest hokage fanfic' stories, there are often plots where the young protagonist has to overcome great challenges. For example, they might face opposition from the older and more traditional ninja in the village who don't believe a young person can lead. The young Hokage - to - be may also have unique ninja abilities that they use to prove their worth.
Naruto himself could be a potential character, perhaps in a mentoring role to the 6th Hokage. Sasuke could also be there, maybe as an ally or a rival in some aspects of the story.
Even Naruto himself could be a subject of this 'evil Hokage' concept in fanfiction. Maybe he is possessed by some dark entity or has a major change of heart due to some extreme event. This would completely change his character and turn him into an evil Hokage, which would be a very interesting and unexpected twist.
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.
Shikamaru is another possibility. He is known for his strategic mind. As Hokage, he could use his intelligence to make wise decisions for the village. He may not have the brute strength of Naruto or Sasuke, but his ability to plan and analyze situations would be invaluable in leading Konoha.
The other ninja clans' leaders would be important characters too. For instance, the Uchiha clan leader (if the story is set at a time when the Uchiha were still in the village) could play a role in the power dynamics related to the fifth Hokage. And of course, the Hokage's personal friends and mentors from their younger days.
Sasuke could be a great choice. He has powerful abilities and a complex past. His experience as an avenger and then his redemption arc gives him a lot of depth. He has also learned from Naruto and has a different perspective on leadership. He could bring a more strict and strategic approach to being Hokage compared to Naruto.
Perhaps a powerful and corrupt merchant group could be the antagonists. They are secretly trying to take over the village's economy and resources. They use bribes and blackmail to get their way. The Sixth Hokage discovers their plot and has to stop them without causing too much chaos in the village's economic system. They may also have some ninja mercenaries working for them.
Obviously, the new Hokage would be one of the main characters. It could be a character we already know like Naruto's son, who has inherited his father's determination and strength.
In these fanfics, Kakashi could be a popular character. He was Naruto's teacher and now he could be an advisor to Naruto as Hokage. His wisdom and experience would be invaluable. And of course, characters like Shikamaru, who is known for his intelligence, could also be important in helping Naruto govern the village.