A cool storyline could be that Kurama gets a chance to experience the human world through Naruto in a more direct way. He gets to understand human emotions and relationships better, and this changes the dynamic between him and Naruto in unexpected ways.
One interesting storyline could be Naruto and Kurama forming a deeper bond beyond the usual jinchuriki - tailed beast relationship. For example, they might have to work together to save the Hidden Leaf from a new, powerful enemy that neither could face alone. This would involve Kurama sharing some of his ancient knowledge with Naruto to help in the battle.
One interesting storyline could be Naruto and Kurama teaming up to face a new, powerful enemy that neither of them can defeat alone. They have to combine their powers in a unique way, like Naruto using Kurama's chakra in a more refined and strategic manner than ever before.
In some fanfictions, Naruto discovers a new power within himself that is linked to Kurama in a very unique way. This connection then evolves into a sort of partnership that has undertones of a yaoi relationship. For instance, they might have to share a mental space and in that space, their relationship deepens as they learn more about each other.
In Naruto and Kurama fanfiction, one interesting story could be about how Naruto and Kurama form an even deeper bond. They might go on adventures in the spirit world together, learning more about Kurama's past and the history of the tailed beasts. This could lead to Naruto unlocking new powers that are a combination of his own and Kurama's chakra in unique ways.
In some Naruto fanfiction, Kurama might prank Naruto by making his chakra go haywire at inconvenient times, like during a spar with Sasuke. It could be a harmless prank where Naruto's Rasengan suddenly fizzles out because Kurama messed with the chakra flow just for fun.
One interesting Kurama Naruto fanfiction could be about Kurama and Naruto's adventures in a different dimension. In this story, they might encounter new and strange enemies that require them to use their combined powers in unique ways.
In Naruto fanfiction, Kurama knots can represent a unique bond between Naruto and Kurama. Some fanfictions might use Kurama knots as a symbol of their intertwined fates. For example, a knot could signify the moment when Naruto fully masters Kurama's power and they become one in a new way, like a spiritual or energetic connection that's visualized as a knot.
There might be a fanfiction where Kurama and Naruto switch bodies for a day. Naruto has to deal with being a giant fox in the forest, while Kurama has to navigate the human world as Naruto. It would be full of comical situations and also some deep realizations for both of them.
There might be a fanfiction where Kurama and Naruto switch places. Naruto is trapped inside the seal, and Kurama has to deal with the outside world, facing the challenges Naruto usually does. This would lead to a lot of humorous and also some thought - provoking situations.
One plot idea could be Kurama teaching Naruto some ancient and powerful jutsu that only he knows. Since Kurama has a vast knowledge of chakra and ninja techniques from long ago, he could pass on this knowledge to Naruto in a unique way, like through dreams or during their mental conversations.