One common theme is self - discovery. Both Naruto and Naruko may go through a process of understanding themselves better through their relationship. Another is the idea of facing challenges together. They could be dealing with the threats to the village or other ninja clans as a couple. Also, there's often the theme of acceptance, as they accept each other's flaws and strengths in a more intimate way than just as friends.
For Naruto, you can develop his character by having him face new challenges related to his relationship with Narumi and Naruko. For example, he might struggle with how to balance his friendship with both of them. Narumi could be developed by giving her a backstory that ties into the Naruto universe in a unique way, like she has a family connection to an old ninja clan. And for Naruko, you can explore her more feminine side in contrast to Naruto's more brash nature, especially when it comes to her interactions with Narumi.
For Naruto, you could show his growth in terms of his leadership skills when he's with Naruko and Kushina. He could learn to be more patient and understanding, especially when Naruko might have a different approach to things. For Naruko, her character could be developed by showing her struggle to be recognized in a world where Naruto already has a reputation. Kushina could be developed by exploring her motherly side more deeply, as she interacts with both Naruto and Naruko.
It might develop through shared battles. As Naruto uses his godlike powers in fights, Naruko sees his strength and determination, and she is drawn to him more.
Sakura could be a potential character. She has a long - standing relationship with Naruto, and in this harem scenario, she might be jealous of Naruko at first but then come to accept the situation. Hinata could also be part of it. Given her love for Naruto, she would be an interesting addition to the harem, adding a shy and gentle dynamic.
One common theme is friendship. They often start as friends and then it might develop into something more. Another theme is adventure. They go on quests together. And love, of course, is a big theme as they are the main characters in the fanfiction and their relationship is explored.
The relationship could develop through shared experiences. For instance, they might go on a mission together where they have to rely on each other to survive. Naruto could see the Naruko clone's determination and courage, and she could see his kind heart. This mutual admiration could lead to a deeper emotional bond. Another way is through Naruto teaching the Naruko clone about things she doesn't understand, like the history of the village or certain jutsu. This teacher - student dynamic can slowly transform into a romantic relationship as they get closer.
In the fanfiction, Naruto and Naruko could start off as strangers who are brought together by the mystery of their Uzumaki bloodline. They might be curious about each other's abilities and start to train together. During this process, they would have small arguments because of their different ways of using the bloodline powers. However, these arguments would actually make them understand each other better. As time passes, they become closer and closer, and the relationship develops from acquaintances to friends, and finally, lovers. Their Uzumaki bloodline would be like a thread that ties them together throughout the development of their relationship.
One common theme is friendship. They often explore how Naruto, Naruko and Narumi form a strong bond of friendship through shared experiences. Another theme is adventure, as they go on various quests together.
One popular 'naruto x naruko x narumi fanfiction' is 'The Trio's Adventure'. It focuses on their unique bond and the adventures they embark on together in a world filled with new challenges and mysteries.