One unique idea is the exploration of their artistic views. Deidara is obsessed with his explosive art, while Naruto has his own idea of what it means to be strong and leave a mark. Some fanfics play with the idea of them sharing and comparing these views, like in 'The Art of Bonding' where they have a series of conversations about their respective 'arts'.
Another unique aspect in some fanfictions is the role - reversal. Imagine Naruto being in a position where he has to understand Deidara's motives more deeply, almost like becoming a bit of a 'Deidara - expert'. In 'Naruto's Understanding of Deidara', Naruto tries to prevent Deidara from going down a dark path by truly understanding his past and his love for art, which is a really different take on their relationship.
One idea could be that they discover they are brothers in a hidden past plot twist. Maybe their parents were from different villages but fell in love secretly. As brothers, they could team up to face a new and powerful enemy that neither could defeat alone.
Another interesting plot could be a time - travel scenario. Fem Deidara travels back in time and meets a younger Naruto. She decides to change the course of events in the ninja world by training Naruto in some unorthodox ways, using her explosive art as a form of training to make Naruto more powerful in a different way than he was originally trained.
One plot idea could be that Naruto, in his never - ending pursuit of understanding different shinobi abilities, meets Deidara during one of his missions outside the Hidden Leaf. Deidara, being an artist at heart, is intrigued by Naruto's determination and they end up having a series of battles and conversations that gradually change their views of each other. Another could be a time - travel plot where Naruto is sent back in time and has to deal with a younger Deidara and tries to prevent him from joining the Akatsuki.
One idea could be a story where Naruto meets a female version of Deidara in a parallel universe. They start off as enemies but gradually come to understand each other's pasts and find common ground. For example, they both have a passion for their respective arts, Naruto with his Rasengan and the female Deidara with her explosive clay creations. Another plot could involve them teaming up to take on a greater threat that endangers both their villages. They learn to combine their skills in unique ways, creating a bond that goes beyond their initial differences.
One idea could be a Deidara crossover with the Naruto world and the world of One Piece. Deidara could end up on the Grand Line and his explosive art would be a huge shock to the pirates there. He might team up with some pirates to find new materials for his art or he could be seen as a threat and constantly chased.
In some fanfictions, Naruto crosses over into a world of ancient mythology. He meets gods and monsters from different mythologies like Greek, Norse or Egyptian. His ninja powers are put to the test as he tries to navigate this new and dangerous world. It's an interesting idea to see how he fares against such powerful and otherworldly beings.
In some fanfictions, Kurama can take a human form and interact with Naruto in a more 'human' way. For instance, they could go shopping together in the Hidden Leaf Village.
Another unique idea is to have a Hyuga character who completely rejects the traditional ways of the clan. Instead of following the strict hierarchy and training methods, they venture out on their own path, maybe even teaming up with outcasts from other clans. This creates a whole new dynamic and story as they face opposition from their own clan while trying to prove that their new way can be just as effective or even better.
One unique idea is to have the chunin exams take place in a completely different setting, like an underwater city. Another could be making the main characters lose their powers temporarily during the chunin exams, adding a whole new level of challenge. And there's also the idea of having non - ninja characters participate in the chunin exams in a 'naruto chunin fanfiction'.
One idea could be that Naruto gets a ponytail after a magical encounter. For example, he meets a spirit who gives him a new hairstyle as a gift, but the ponytail has special powers like it can sense danger. So, when there's an enemy approaching, the ponytail glows or something.