One possible plot could be that Naruto's death in Wave shocks the ninja world. His body then undergoes some dark transformation due to a hidden curse or experiment. As a monster, he might lose his sense of self but retain his ninja skills. His former friends like Sasuke and Sakura would be torn between trying to save him or having to fight him to protect the village. The story could explore themes of loss, the power of darkness, and the struggle between friendship and duty.
Sasuke would likely be deeply affected. He might initially be angry that he couldn't protect Naruto. As Naruto becomes a monster, Sasuke would be conflicted between his desire for power and his loyalty to his friend. He might try to find a way to bring Naruto back to normal so he can have his rival back. Sakura would be heartbroken. She would probably cry a lot and then try to find a medical solution to reverse the transformation. Kakashi would see it as his failure to protect Naruto and would do everything he could to stop the monster Naruto from causing harm while also looking for a way to save him.
As the daimyo, Naruto would face numerous difficulties. For starters, the cultural differences within the Wave Country itself could pose a problem. There might be different ethnic groups or regions with their own traditions that conflict with Naruto's plans for unity. Moreover, he has to deal with the after - effects of any previous wars or conflicts in the Wave Country. Rebuilding damaged areas and rehabilitating the affected people would require a lot of resources and careful planning. Additionally, he has to balance his ninja duties (if he still has them) with his new role as daimyo, which could be a real headache.
It could be Orochimaru. He has always been interested in experimenting with new forms and powers. If Naruto becomes a monster, Orochimaru might see him as a perfect specimen to study or use for his own evil plans.
One possible plot could be that Naruto is experimented on by a rogue ninja group using forbidden jutsu, which turns him into a monster. As a monster, he struggles to control his new powers and is shunned by the village at first. But then he uses his new form to protect the village from a greater threat.
Well, Naruto being the daimyo could bring a lot of positive changes. He might start by reforming the military system. Since he has his own ninja skills and experiences, he could train the local forces better. Also, he'd probably focus on improving the economy. For example, he could use his influence to get more trade deals with other countries. And in terms of society, he'd promote equality among all the people in Wave Country, regardless of their social status or origin.
I'm not sure specifically as there could be many different versions of such a fanfic. But generally, it might involve Naruto facing some overwhelming danger in the Wave arc that leads to his death, perhaps a more powerful enemy than in the original story or a failed mission that costs him his life.
Well, a 'naruto wave kage fanfic' could center around the Wave Village and its connection to the various Kage. It might tell a story of how the events in the Wave Village impact the decisions of the Kage from different ninja villages. For example, it could be about how the actions of the ninja in the Wave Village during a crisis make the Hokage of Konoha take certain diplomatic or military actions towards other villages. It could also explore the backstories of the Kage characters in relation to the Wave Village, like if one of the Kage had a personal experience in the Wave Village when they were younger that shaped their leadership style.
It could be Zabuza. He might pretend to be on Naruto's side at first during the Wave events and then betray him when Naruto least expects it. Zabuza is a mercenary and his loyalty can be easily swayed.
In a 'naruto wave kage fanfic', Naruto is almost always a main character due to his significance in the Naruto universe. The Kage are also central as they represent the leadership of their respective villages. The Wave Village might introduce characters like Tazuna or Inari as main characters too. Tazuna was important in the original Wave arc in Naruto. His skills as a bridge - builder could play a different role in the fanfic, like being a symbol of hope for the Wave Village in a time of conflict involving the Kage. Inari, with his growth and potential, could also have a major part in the story, perhaps forming an unexpected bond with one of the Kage.