One plot idea could be Jiraiya training Kushina. Since he was a great ninja and had a lot of knowledge, he could pass on some unique jutsu or survival skills to her. This would not only strengthen Kushina but also create a bond between them based on mentorship.
Well, a story could be centered around Naruto having prophetic dreams about Kushina. These dreams lead him to explore more about his mother's past and in doing so, he uncovers secrets that strengthen his connection with her. They could also be in a situation where they have to enter each other's minds to fight off an evil entity that's attacking their mental states.
One idea could be a story where Naruto discovers a hidden journal of Kushina's that reveals secrets about his family and his own powers. This could lead him on a journey to understand his mother better and unlock new abilities.
One idea could be a time - travel fanfiction. Naruto Uchiha (assuming it's an AU where Naruto has Uchiha heritage) somehow travels back in time and meets Kushina Uzumaki. They could form an unexpected friendship as he tries to protect her from the events that would lead to her death. He could also use his knowledge of the future to change things in the village for the better.
One idea could be exploring the lost techniques of the Uzumaki clan. For example, a young Uzumaki descendant discovers an ancient scroll that holds the key to a powerful sealing jutsu long forgotten. This could lead to a series of adventures as they try to master it while also fending off those who want to steal the knowledge.
Well, Archive of Our Own (AO3) is also a great place. You can search for tags like 'Kushina Uzumaki' and 'Jiraiya' and exclude any tags that might suggest adult or inappropriate content. There are often some well - written, clean stories that focus on their relationship in different ways, like their roles in the Hidden Leaf Village or their potential interactions based on their abilities.
One idea could be that Jiraiya focuses on Naruto's rasengan training in a more extreme way. He takes Naruto to a secluded place full of natural challenges like strong water currents or rocky terrains. There, Naruto has to constantly adapt and use his rasengan in different situations to overcome obstacles. Another plot could involve Jiraiya teaching Naruto some secret clan jutsus that he discovered during his travels, which could give Naruto an edge in future battles. And also, Jiraiya could train Naruto in stealth and espionage skills, which are essential for a shinobi but Naruto hasn't had much focus on before.
Well, perhaps there could be a plot where they both get trapped in a mysterious dimension. In this dimension, they have to rely on each other's skills. Jiraiya's knowledge of sage mode and Orochimaru's various jutsu could be combined to find a way out. It could also explore their relationship in a more in - depth way as they face different challenges together.
One idea could be exploring Naruto's deeper connection to the Uzumaki clan's sealing jutsu. Maybe he discovers an ancient Uzumaki scroll that contains a powerful sealing technique that was lost over time. This could lead him on a journey to master it and in the process, he uncovers more about his clan's history and secrets.
One idea could be that Tayuya, who was an enemy before, is now a part of the Uzumaki clan. She and Naruto discover they have a connection through their clan heritage. This could lead to them going on a journey to explore the secrets of the Uzumaki clan together.
One interesting plotline could be Kushina's time as a genin. Maybe she had some unique adventures or challenges during her early days as a ninja. Another could be her interactions with other Uzumaki clan members who might have had different powers or knowledge.