The concept of 'Naruto is a Duke fanfiction' is appealing for several reasons. Naruto is a character known for his determination, loyalty, and unique abilities. Placing him in the role of a duke allows for a whole new set of stories. He could use his ninja skills to protect his duchy, or face political intrigue in ways that are different from the normal Naruto storylines. It also gives an opportunity to see how the Naruto universe's concepts like chakra and jutsu might interact with the more traditional elements of a duke - led society, like feudal laws and social hierarchies.
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.
There are so many fanfictions out there, and the 'Naruto is a Duke' concept is quite interesting. You might want to look for it on platforms where Naruto fans gather to discuss fan works. Sometimes, other fans can give great recommendations. Maybe start with Naruto fan forums and ask if anyone has come across such a fanfiction.
One possible plot might be that the Duke of the West is on a quest in the Naruto world and along the way, he meets different female characters who gradually form his harem. They all have different motives and powers, and together they face challenges like battles against powerful villains or trying to uncover ancient secrets in the Naruto realm.
You could try 'The Bachelor Duke's Unforeseen Love'. It's a great fanfic that delves deep into the duke's character. The story has a well - developed plot with a strong female lead who challenges the duke's bachelor ways.
Adventure is also quite common. They go on quests and face challenges together. For example, in many fanfictions, they explore unknown places. It makes the story exciting and full of surprises.
Obviously, Harry is the main character as he is the duke. But often, there will be his loyal servants like his butler, Mr. Thompson, who helps him manage the ducal estate. And there could be a female lead, perhaps Lady Elizabeth, who is a love interest and also provides support in different situations.
The allure of the duke's bachelor status. It gives the writer a lot of room to play with his character development. He can be a charming playboy at first and then transform into a loving partner, which is a very appealing storyline.
One common theme is adventure. Duke Crocker is often involved in exciting and dangerous adventures, and with an OC added, it can create new and interesting storylines within that adventure - filled world.