Some ideas include a fanfic where Sarutobi is a mentor to Naruto and Sasuke in a different way than in the original story. For example, he teaches them about a long - forgotten ninja art. Another idea is a fanfic where Naruto, Sasuke and Sarutobi form a special squad to take on a dangerous mission outside the village. Or a fanfic where Sarutobi's past actions are revealed in a new light that changes Naruto and Sasuke's perception of him and they have to come to terms with it.
One idea could be a time - travel fanfic where Sarutobi goes back in time and tries to prevent the rift between Naruto and Sasuke from ever happening. Another could be a fanfic where Naruto and Sasuke are transported to a parallel universe where Sarutobi is still alive and they have to work with him to get back home. Or a fanfic where Sarutobi trains Naruto and Sasuke together in a secret art that no one else in the village knows about.
A unique idea is a fanfic where Sarutobi is reborn as a young ninja at the same time as Naruto and Sasuke and they become friends and train together. There could also be a fanfic where Naruto and Sasuke get trapped in Sarutobi's memories and have to relive his most important moments to escape. And a fanfic where Sarutobi's spirit is trapped in a powerful artifact and Naruto and Sasuke have to free him while also dealing with the challenges that come with it.
I really like 'Naruto, Sasuke and Sarutobi: A New Beginning'. In this fanfic, it starts with Sarutobi having a premonition about the future of Naruto and Sasuke. So he takes steps to guide them differently. It's an interesting take on their relationship. 'Sasuke's Redemption under Sarutobi' is also good. It shows Sasuke trying to make amends with the village with Sarutobi's guiding spirit in mind. And 'The Hidden Power of the Trio' is a fanfic that gives a new perspective on the powers they possess and how they can be combined for the greater good.
One idea could be that Naruto, as Sarutobi's apprentice, discovers a new jutsu hidden in the old Hokage's personal library. This jutsu could be a powerful fire - style technique that was once used by Sarutobi's master. Naruto would have to train hard to master it, facing challenges like controlling the intense heat. It would also add a new dimension to his combat abilities and make him stand out even more in battles against powerful foes.
How about a story set in an alternate universe where Sasuke and Hinata are arranged to be married? Naruto then tries to break the arrangement because he realizes his true feelings for Hinata. This would create a whole new set of relationships and conflicts among the three.
Another interesting plot is the soul - swap. Imagine Naruto and Sasuke swapping souls. They have to deal with living in each other's bodies and understanding each other's perspectives in a very literal way. It leads to some hilarious and also very heart - warming moments as they learn more about each other.
Another unique idea is time - travel. There are fanfictions where Sasuke travels back in time and tries to prevent the tragedies that happened to his family. This creates a whole new set of interactions with Itachi and Naruto.
A fanfiction concept could be that as cousins, they have a shared family jutsu. However, it has been lost over time. So, Naruto and Sasuke team up to find and relearn this jutsu. Along the way, they face many challenges and enemies. This adventure not only strengthens their bond as cousins but also makes them stronger ninjas.
One idea could be a story where Sasuke, Hinata and Naruto are on a joint mission. Naruto's cheerfulness, Hinata's gentle strength, and Sasuke's brooding nature create an interesting dynamic. They face a powerful enemy and have to learn to combine their unique skills, like Naruto's Rasengan, Hinata's Gentle Fist, and Sasuke's Chidori, to defeat it.
One idea could be exploring the early days of the Sarutobi clan. Maybe show how they developed their unique jutsu. Another could be a story centered around a young Sarutobi clan member who has a rare ability and must prove themselves in the Hidden Leaf Village.
One idea could be a fanfic where Sarutobi has to face a new and powerful enemy that threatens the Hidden Leaf Village in a way no one has seen before. This would test his leadership and combat skills.
A fanfiction could be about Sai trying to befriend Sasuke. Sai, who is often socially awkward, attempts to break through Sasuke's cold exterior. Meanwhile, Naruto is caught in the middle, trying to help Sai while also dealing with his own complex relationship with Sasuke. It could be a story full of humor and some tense moments.