One possible plot could be that the Daimyo guard has to protect the Daimyo from a secret ninja clan that has a vendetta against him. The guard uses his unique skills, perhaps some special jutsu passed down in his family, to fend off the attackers.
In this fanfiction, the Daimyo guard could befriend Naruto. Naruto, with his strong sense of justice, might inspire the guard to be more than just a protector. So the plot could follow the guard's journey of self - discovery while still fulfilling his duties to protect the Daimyo. He could learn new ninja techniques from Naruto and use them to better protect the Daimyo.
It could be a rogue ninja who was once part of the Daimyo's own forces but turned against him for some reason, like not getting the recognition he thought he deserved. He now wants to take revenge by assassinating the Daimyo.
Well, in this fanfiction, Naruto as the Daimyo could focus on improving the living standards of the people in Whirlpool. He'd use his connections, like with Tsunade in Konoha, to get medical help and resources. Maybe he'd also try to revive some of the lost Whirlpool clan techniques. He'd have to deal with internal power struggles too, as there would be different groups vying for influence in the newly - developing nation.
One possible plot could be that Naruto, in his efforts to strengthen the bonds between the Hidden Villages and the Daimyo. He is arranged to marry a Daimyo's daughter. At first, Naruto is hesitant as he has his life in the village and his friends. But as he gets to know the Daimyo's daughter, he discovers she has a kind heart and shares his vision for peace. They start working together on various projects for the betterment of the land, and love slowly blossoms between them.
In a 'naruto fire daimyo fanfiction', the plot could involve the Fire Daimyo playing a crucial role in the politics of the Hidden Leaf. Maybe he has some secret plans to strengthen the alliance between the Leaf and other villages. He could also be a target for some enemy shinobi who want to disrupt the balance of power in the Fire Country.
Well, one possibility could be that the Daimyo of Sound decides to form an alliance with Konoha. He realizes that by joining forces, they can better protect their lands from common threats like the Akatsuki. So he sends envoys to Konoha to start diplomatic talks, which is full of drama as there are still some mistrusts on both sides.
In this fanfiction, perhaps the Daimyo of Wave is ill and there is a power struggle within his court. Naruto gets involved as he was once a hero in Wave. He tries to ensure a peaceful transition of power while also dealing with external forces who want to take advantage of the chaos. There could be epic battles and emotional moments as Naruto fights for what he believes is right for Wave.
Perhaps Naruto as Daimyo decides to create a new type of military force that combines ninja skills with traditional samurai training. This would lead to a whole new set of adventures as he has to train these new soldiers and face off against other regions' military powers. He could also use his charisma to form alliances with other Daimyos in a way no one else has before.
One possible plot could be that the daughter of the Fire Daimyo gets involved in some sort of political intrigue within the Fire Country. Naruto, being the hero he is, stumbles upon this situation while on a mission in the area. He then decides to help her out, and in the process, they form a strong friendship that could potentially turn into something more. This would bring a new dynamic to the Naruto universe as it combines the world of shinobi with the political realm of the daimyo.
One possible plot could be Naruto using his unique skills and charisma to bring about major reforms in the Fire Daimyo's territory. He might focus on improving the living conditions of the common people, perhaps by introducing new ninja - related security measures. For example, he could train a special force of non - ninja civilians in basic self - defense, which would also help in strengthening the overall security of the region.
One possible plot twist could be that the Fire Daimyo has secret ninja skills. He might train Naruto in a different style than in the original series, which could lead Naruto to develop unique abilities. This would change the power dynamics in the Naruto universe.