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.
Minato might be a common character. Since he is Kushina's husband in the original story, his presence can add an interesting dynamic. Also, Jiraiya could be there. He was Naruto's mentor and his interactions with the harem situation could be quite humorous.
One idea could be that as Minato is dying, he passes on his special jutsu knowledge to Naruto in a final moment of father - son connection. Kushina, on the other hand, tries to comfort Naruto while also mourning Minato.
One common theme is family. Since Kushina is Naruto's mother, many fanfictions focus on them building a relationship that they were deprived of in the original story. It's about filling that void of a mother - son bond.
Another aspect could be that the fanfiction delves into how Kushina's presence affects Naruto's relationships with others. For instance, his relationship with Sasuke could be different. With a strong maternal figure in his life, Naruto might be more stable emotionally and be able to approach Sasuke in a more understanding way, which could potentially change the whole dynamic of their rivalry and friendship.
One possible plot could be that Natsumi is a new character who befriends Naruto. Through Naruto, she gets to know about Kushina. They then form a unique bond where they all support each other in Naruto's journey to become Hokage. Natsumi might have some special skills that complement Naruto's and Kushina's abilities.
Yes, there are likely some non - adult fanfictions out there. Some might focus on their relationships in a more family - oriented or friendly way. For example, they could be depicted in a story where they train together, share their dreams and support each other in achieving their goals in the ninja world.
In this fanfiction, their relationship would evolve in a very special way. Naruto, with his newfound godlike status, would be more in tune with Kushina's emotions. He would be able to sense if she was having a bad day or if the baby was causing her discomfort. He would use his powers to comfort her, like creating a warm, soothing energy around her. Kushina would be in awe of Naruto's growth but also rely on him more. They would talk about how to raise their child, with Naruto's experiences as a hero and Kushina's wisdom combining to form a unique parenting plan for their soon - to - be - born baby.
One common theme is the exploration of their family bond. Since Kushina is Naruto's mother, fanfictions often delve into how a more powerful Naruto could interact with his mother in different scenarios, like if she was still alive. Another theme is power - related, showing how Naruto's power could be combined with Kushina's traits in some way.
Maybe an evil organization that wants to use Naruto's power and the connection he has with Kushina for their own dark purposes. They see Natsumi as an obstacle in their plan because she is always by Naruto's side. This organization could be experimenting with dark jutsu and need Naruto's chakra and Kushina's latent abilities (passed on to Naruto) to complete their evil experiments.