Perhaps in the fanfiction, there are internal power struggles within the villages that are revealed at the Kage Summit. A young ninja from one of the villages might try to influence the decisions of their Kage during the summit. There could also be a cultural exchange aspect, where the Kages learn about each other's villages' traditions and find ways to incorporate beneficial elements into their own villages.
Naruto could still be the main character. As the Hokage, he would be at the center of the Kage Summit. His ideals of peace and unity would play a major role in the interactions with the other Kages. He might try to convince the other Kages to support a new initiative for a more united ninja world.
Obviously, Naruto is one of the main characters as he is the Rokudaime Hokage in this fanfiction. Sasuke could also be a main character, perhaps as Naruto's advisor or someone who helps him deal with external threats. Sakura might be there too, probably as a medic - ninja in the village, helping to treat the injured during any conflicts.
The fanfiction might explore Dark Naruto's motives during the Kage Summit. He could be on a mission to expose the secrets that the Kages have been hiding from the shinobi world. His actions at the summit could be a way of shaking up the established order. For example, he might reveal a conspiracy among the Kages that has been affecting the balance of power in the ninja villages. This would not only put the Kages in a difficult position but also force the other shinobi present to re - evaluate their loyalty.
One interesting plotline could be Naruto's challenges in leading the village as the Rokudaime Hokage. He might face political intrigue from within the village or threats from other hidden villages. Another could be his attempts to reform the ninja system, bringing in new training methods for the younger generation.
Yes, in some fanfics of 'Rokudaime Hokage', Sasuke could be depicted as a Naruto fan. Fanfic authors often explore different character dynamics, and Sasuke having an admiration for Naruto similar to a fan's view can add an interesting twist to the story.
Hinata would be an important character as Naruto's wife. She could support Naruto in his Hokage duties and also play a role in the social aspects of the village. Their children might also be part of the story, representing the new generation.
One interesting plotline could be Naruto facing new and unexpected threats to the village as Rokudaime Hokage. He might have to deal with political intrigue within the village as some may not fully accept his leadership at first.
In a 'Dark Naruto Kage Summit' fanfiction, it's possible that Dark Naruto is actually a misunderstood figure. He arrives at the summit not to cause destruction but to seek help. His dark transformation might be the result of an experiment gone wrong that he had no control over. The Kages, initially seeing him as a threat, might come to realize his true situation after he reveals his story. This could lead to a different kind of relationship between Naruto (even in his dark state) and the Kages, where they work together to find a solution to his problem.
The Kages themselves are often main characters. For example, Tsunade from Konoha, Gaara from Suna, and the other village leaders. They play important roles in the political and power - related discussions during the summit.