Definitely. A lot of fanfiction writers choose to focus on the emotional bond between Naruto and Kushina. They might write about how Naruto discovers more about his mother's past and how it makes him feel closer to her, without any adult - themed content.
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.
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.
One common theme could be family. Since Kushina is Naruto's mother, and Naruko (if in a different context) could be part of an extended family - like bond. Another theme might be the passing of the ninja way. Kushina could pass on her wisdom and skills to Naruto and Naruko, guiding them in their ninja journey.
Another idea is a chakra - related plot. Kushina has a very special chakra, and Naruto could discover some hidden aspect of his own chakra that is related to his mother's. They could then work together to unlock this new power. Along the way, they share stories about their lives, and Naruto learns more about his parents' past and how they met. This would be a great way to build a story around them without any adult content.
Perhaps Naruto finds a way to travel back in time and prevent Kushina's death in the first place. He could use his Sage Mode or some other special ability to manipulate time. And then, by changing the past, he effectively'revives' her in the present. In the Naruto universe, there are all kinds of crazy powers, so time - travel isn't completely out of the question.
In some fanfictions, Kushina was sealed into Naruto through a complex jutsu. It might be a modified version of the sealing jutsu used to seal the Nine - Tails. The process could involve special incantations and chakra manipulations.
One common plot is Kushina finding Naruto in a different time or dimension. For example, she might end up in the future where Naruto has grown up and she gets to see the kind of person he has become. It's an emotional and interesting concept as she gets to witness all his achievements and the challenges he has overcome.
The comfort from Kushina in the fanfiction might also inspire Naruto to be a better person. He might strive to live up to the values his mother represents, like kindness and perseverance. Her presence in his life, even if just in the fanfiction, can be a guiding force for him, making him more determined to protect those he loves and make the world a better place.
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.