Obviously Naruto would be one of the main characters as the title implies he's the one attacking. And the Kages, like Gaara, Tsunade, and the other village leaders would also be main characters since they are at the summit that Naruto is attacking.
In this fanfiction, Naruto might be pushed to attack the Five Kage Summit due to some misinformation or a threat he perceives to Konoha. Maybe he thinks the Kages are planning something against his village.
One possible plot point could be Naruto's reasons for attacking the Kage Summit. Maybe he's been misinformed or is trying to prove a point. Another could be the reactions of the various Kages, like how Tsunade might be conflicted because she knows Naruto.
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 Kage Summit Naruto fanfiction could be one where Naruto has a secret plan during the summit that no one anticipates. He might use his charm and newfound diplomatic skills to sway the Kages in a direction that benefits the entire shinobi world.
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.
In some naruto kage summit fanfiction, there might be a plot where a Kage is actually a spy for another village. This could lead to a lot of drama and political intrigue during the summit as secrets are revealed and trust is broken.
Well, in the 'Naruto goes to the Kage Summit' fanfiction, Naruto could be in for a wild ride. He might be representing Konoha in some crucial discussions. There could be political intrigue among the Kages, and Naruto, being Naruto, would probably try to cut through all that and promote unity. He may also show off some new jutsu he has learned to gain the respect of the other Kages.