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 possible plot could be that Harry starts to have strange dreams and visions which are actually Obito's memories. He begins to question his own identity and purpose. As he delves deeper into these memories, he might discover new magical abilities or ways of thinking that are influenced by Obito's ninja world experiences. This could lead him to form new alliances at Hogwarts and change the way he approaches the battle against Voldemort.
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.
In some fanfictions, it might be so. Fanfiction allows for creative and often out - of - canon interpretations. However, in the original Naruto series, Naruto has no relation to Obito in this way.
Harry would likely become more cynical. Obito's experiences of betrayal and loss could make Harry less trusting. He might also become more secretive as he tries to figure out these new memories on his own.
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.
I think it depends on personal preferences. Some might like the Naruto manga for its overall plot and character development, while others might find Obito's storyline more engaging due to its complexity and emotional depth.
One implication could be a change in Naruto's character development. Knowing Obito as his father might make Naruto question his own values more. Another is the impact on the relationship with other characters. For example, his relationship with Kakashi would be very different.
In this fanfiction, Obito's development can be quite interesting. He may begin with his own motives that are not entirely pure. However, as he spends more time with Naruto, he starts to see the world through Naruto's eyes. This could lead to him becoming more empathetic towards others in the ninja world. For example, he might start to understand the importance of protecting the village and its people, just like Naruto does.
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.