A theme that frequently appears is the exploration of family. Given Naruto's complex family situation as an Uchiha and Naruko's connection to him, they might create a new kind of family unit. Also, the theme of self - discovery is there. As they interact, they learn more about themselves and their capabilities.
A really interesting plot could be a time - travel fanfiction. Naruto Uchiha (again, with his Uchiha - like characteristics) travels back in time and meets a younger Naruko Uzumaki. He tries to change the future for the better, and in the process, they fall in love. Or perhaps a story where they are in a different world altogether, a world where the ninja clans have different power dynamics. They have to rely on each other to survive and in that process, their love blossoms.
Well, 'Uchiha Naruto and Naruko's Adventure' is quite interesting. In this fanfiction, they embark on a journey outside of Konoha to discover a new threat. Along the way, their relationship blossoms from comrades to something more. It has great character development and an engaging plot.
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.
Maybe they are forced to work together on a mission where they initially clash because of their different personalities. However, over time, they discover they have more in common than they thought, like their love for the village and their determination to protect it. This gradually builds a deeper bond between them.
One idea could be that Naruto Uchiha and Naruko Uzumaki team up to take on a powerful new enemy that threatens the Hidden Leaf. They could combine their unique jutsu skills to defeat the foe.
A great way to develop their relationship is through shared traumas or experiences. Let's say they both lose someone important in a battle. They can comfort each other, and this emotional bond can be the start of a deeper connection. As they train to become stronger to prevent future losses, they rely on each other more and more, leading to love. They might also have arguments along the way, which can add realism to their relationship as they learn to understand and forgive each other.