It's popular because it gives Naruto a different role. Instead of just being a ninja, he gets to be in a position of political power as a daimyo. This shows a new side of his character and how he can influence the world in a non - combat way.
It's possible that an outside force from another country is behind it. They want to weaken the Land of Fire by putting Naruto, a powerful and unpredictable element, in a position where he has to deal with political matters rather than ninja battles. They believe this will make the Land of Fire more vulnerable to their future attacks.
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.
The Daimyo can be developed as a wise and shrewd leader. For example, he could start as a somewhat mysterious figure who gradually reveals his grand plans for the land. He can be shown to have a deep understanding of politics and power dynamics, and his interactions with Naruto and Hinata could be used to teach them valuable lessons about leadership and responsibility.
One interesting 'naruto daimyo fanfiction' could be about a daimyo's secret alliance with a hidden ninja clan. This alliance might be formed to protect the land from a greater, unseen threat. In the story, the daimyo uses his political power and resources, while the ninja clan offers their combat skills and stealth.
A powerful female character can also be a main character in 'naruto daimyo fanfiction'. She could be a diplomat who tries to negotiate between the daimyo and the ninja villages. Her charm, intelligence, and political acumen make her a central figure in the story.
One idea could be Naruto using his unique jutsu to protect the daimyo from hidden assassination attempts. For example, his shadow clone jutsu can be used to surround the daimyo and act as decoys. Also, his Rasengan could be a powerful weapon against any approaching enemy ninjas.
One great 'naruto is daimyo fanfiction' might be the one where Naruto uses his newfound daimyo - like status to bring peace in a unique way. He could start by reforming the economic system in the Land of Fire, using his understanding of the common people's needs from his own humble beginnings.
In a fanfiction where Naruto is adopted by the Daimyo, Naruto would likely experience a significant shift in his social status. He would no longer be the lonely orphan in the village. Instead, he'd be part of the Daimyo's family. This could open up new opportunities for him. He might meet different kinds of people, including nobles and diplomats. His ninja skills could be put to use in different ways, perhaps in diplomatic negotiations or protecting the Daimyo's territory. His perspective on the world would change as he'd be exposed to the political and social workings of the Daimyo's court.
Power and politics play a big role too. Her position gives her influence, and fanfictions may explore how she uses that influence in the Naruto world's political landscape. Maybe she tries to prevent a war or promote peace between different regions.