The impact would be huge. Naruto has always been a symbol of hope and friendship in the Naruto world. If he becomes like Obito, that symbol would be shattered. His friends and allies would be in shock and confusion. Konoha would likely be thrown into chaos as they try to figure out what happened to Naruto and how to deal with his new, potentially dangerous mindset.
In a fanfiction where Naruto becomes Obito, it could be due to an outside force. For example, an ancient evil entity that wants to disrupt the balance of the ninja world. It targets Naruto and messes with his mind, implanting Obito - like thoughts and desires. Naruto would then struggle between his original self and this new, Obito - influenced persona, leading to many internal and external conflicts within the story.
Another plot could be that Naruto is tricked into believing a false narrative about the ninja world. Similar to how Obito was manipulated by Madara's lies. He then starts to act in ways that are contrary to his usual self. He might target the other villages, thinking he is doing the right thing for some grand, but misconstrued reason. This would lead to him being at odds with his former friends, who would be desperate to bring the old Naruto back.
One possible fanfiction could be about Naruto and Obito teaming up to face a new, powerful enemy. They could combine their unique skills, like Naruto's Rasengan and Obito's Kamui. Their relationship could start off rocky due to their past differences but gradually turn into a strong bond as they fight side by side.
His relationship with Sasuke would be drastically different. Instead of their friendly rivalry, they could become enemies. Since Obito had a very different view from Kakashi, Naruto might also turn against Kakashi in this fanfiction. His friends like Sakura and Shikamaru would be confused and try to stop him, but he would be so far gone in his new mindset that he might not listen.
Obito's influence would likely make Naruto more aware of the darker side of the ninja world. Naruto is usually very optimistic, but with Obito's guidance, he would see the hardships and betrayals that can happen. For example, Naruto might become more cautious in his trust of others.
One great fanfiction about Obito being revealed in Naruto could be one where his true motives are slowly uncovered not just by Kakashi, but by the entire ninja world. It could start with small hints that the Akatsuki's actions are somehow related to Obito's past and his broken dreams. As the story unfolds, characters like Naruto start to put the pieces together, realizing that Obito is not just a random enemy but a product of the shinobi world's failures. This type of fanfiction often delves deep into Obito's psyche, exploring his love for Rin and how it was twisted into hatred after her death.
One great 'Naruto and Obito Fanfiction' is 'The Redemption of Obito'. It explores Obito's journey towards redemption in a really interesting way, showing how his relationship with Naruto could potentially change his fate. Another one is 'Naruto and Obito: A New Bond' which focuses on them forming an unexpected alliance and facing new threats together. There's also 'Obito's Second Chance with Naruto' that delves into Obito getting a chance to make things right with Naruto's help.
Their friendship in fanfiction could be really interesting. Maybe they start as rivals but then realize they have a common goal. For example, protecting the Hidden Leaf. They could learn from each other's jutsu. Naruto could learn about space - time ninjutsu from Obito while Obito could learn about Naruto's positive attitude towards life.
Besides Obito, Sasuke could be a main character in this fanfiction. Sasuke, with his own journey of redemption and his understanding of power and the ninja world, could have an interesting dynamic with the reincarnated Obito. Also, Sakura might play a role. She could be the one who tries to heal the reincarnated Obito, both physically if he is injured during his new adventures and emotionally from the traumas of his past life.