Well, it could be about Naruto finding himself in a strange Western - like setting where he has a harem. Maybe he uses his ninja skills to protect his harem members from various threats in this new world.
Obviously Naruto would be the main character. Sakura could potentially be part of his harem, as she has a long - standing relationship with Naruto in the original series. Hinata might also be there, given her deep feelings for Naruto.
The 'naruto king of the west harem fanfiction' might involve Naruto having a special status as a king in the west. In this fanfiction, the harem aspect could mean that he has a group of female companions who support him, and they all go through various challenges together. It could also explore different cultural elements from the 'west' and how Naruto adapts to them while dealing with his harem.
Since it's a Naruto fanfiction, the 'emperor of the west' might be a powerful figure who challenges the existing power structure in the Naruto world. He could be a villain or an anti - hero. The story may start with his introduction and then show how his actions disrupt the balance in the world. It might involve his encounters with the different ninja villages. He could be seeking to conquer the other regions or he might have some noble but controversial goals. There could be epic battles between him and the well - known Naruto characters as the story unfolds.
Sakura could be a potential member. She has been Naruto's friend and teammate for a long time, and in this fanfiction concept, her relationship with Naruto could evolve into a more romantic one within the harem. Her medical skills would also be an asset to the group.
One potential ally could be the local peasants. Since Naruto is known for his kind heart, he would likely protect and support them. In return, they would support his rule. Another might be some of the local merchants. If Naruto promotes trade and economic growth, they would be on his side.
The main character, the Duke of the West, is likely to be a strong and charismatic figure. Alongside him, Naruto himself might also be a significant character, perhaps as an ally or sometimes even a rival in terms of the relationships with the female characters. And of course, the female characters in the harem, who each have their own personalities, like the strong - willed Temari or the gentle Ino, are also main characters as they are central to the harem concept.
Obviously, Naruto would be one of the main characters. And since it's a harem - themed fanfiction, there would probably be several female characters, but without reading the specific fanfiction, it's hard to say who exactly they are.
It could be the 'emperor of the west' character. However, in some fanfictions, the main character might not be who you expect at first. It could also be a side character who is following or opposing the 'emperor of the west' and through their perspective, we get to know more about this 'emperor' figure. For example, it could be a young ninja from a small village who has to deal with the consequences of the emperor's actions.
It could be about Naruto in a fan - created scenario where he becomes the Dragon Emperor of the West. Maybe it involves Naruto having new powers related to dragons and ruling over a western - themed territory in the Naruto universe.