Well, initially in this fanfiction, Naruto might be forced to join Obito due to some extraordinary circumstances. Maybe they are both trapped in a different dimension. As they figure out a way to escape, they start to understand each other better. Naruto would share his dreams of peace with Obito, and Obito would be intrigued. Once they are back in the normal world, they would have to face the consequences of their new - found alliance. Some would be against it, while others might see the potential for good. This would lead to a series of events where they have to prove themselves and their alliance's worth.
The story could start with Naruto finding Obito in a desolate place. Naruto would be curious and approach him. Then, they would exchange words, and Naruto would offer his help to Obito. As they interact more, they might face some small - scale battles together against rogue ninjas or other threats. This would build trust between them.
In a 'naruto joins obito fanfiction', the development might be centered around redemption. Naruto would see Obito as a lost soul that can be saved. He would constantly encourage Obito to atone for his past sins. Along the way, they would encounter various challenges, such as dealing with the distrust of the other ninja villages. But Naruto's unwavering belief in Obito would slowly change the minds of others. And as they overcome these difficulties, Obito would gradually transform into a more positive character, and together they could strive for a better shinobi world.
Their relationship could begin with a misunderstanding. Maybe Female Obito has a mission that initially seems to conflict with Naruto's goals. However, as they communicate more, they realize they are actually on the same side. This leads to them working together closely. As time passes, Naruto's positive attitude rubs off on Female Obito, and she becomes more open and friendly. They could eventually become like family to each other, always having each other's backs.
In such a fanfiction, the story could take a very dark turn. Naruto's ideals of friendship and peace might be severely tested. He could be forced to question his own beliefs as Obito and Madara have very different outlooks. Maybe Naruto would try to change their minds, but it would be extremely difficult as they are both very set in their ways of achieving a new world order through more extreme means.
The story could develop with Obito training Naruto in his own way, away from the values of the Hidden Leaf. Naruto might grow up with a different set of skills and a different view of the ninja world. There could be a lot of internal conflict in Naruto as he discovers the truth about his origins and the fact that he was taken from his village. This could lead to a showdown between Naruto and the Hidden Leaf at some point, or Naruto might try to find a middle ground between Obito's teachings and his own sense of right and wrong.
The story would take a very different turn. Naruto's godlike abilities would give Akatsuki an edge in battles. But his values would clash with the group's. This could lead to him either changing Akatsuki or being forced out. It would also affect his relationships with his old friends in Konoha. They might see him as a traitor at first, but as the story unfolds, they could come to understand his motives.
A fanfiction story could start with Naruto being in a desperate situation where he feels that the normal path to peace is not working. So, he decides to team up with Obito and Madara. At first, they seem to be working towards a common goal. But then, Naruto realizes that their means are too extreme. For example, he discovers that the Infinite Tsukuyomi they plan would take away people's free will. He then has to find a way to stop them while still maintaining some sort of alliance. This could lead to a complex web of relationships and power struggles within the group.
Their relationship would likely start with mutual respect. Naruto already respected Itachi after learning of his sacrifice. Once they join in the fanfiction, they would gradually become friends. They'd rely on each other in battles, and Itachi might start to see Naruto as a younger brother figure, much like Sasuke. Naruto, on the other hand, would look up to Itachi's skills and wisdom.
The storyline could start with Naruto somehow ending up in Aizen's world. At first, he would be confused and on guard. But as he gets to know Aizen, he might see some potential in him. Naruto would try to change Aizen from the inside. Aizen, on the other hand, might see Naruto as a useful tool or an interesting experiment.
Naruto's character would likely be more complex. He'd be less naive perhaps. Growing up with Obito and Rin, he'd have a different understanding of the ninja world. He might be more secretive too, as Obito has his own secrets.
Naruto's character would likely become more conflicted. He has always been on the side of good, and joining Orochimaru, even if for a good reason, would put him in a morally gray area. His view of power might change as he is exposed to Orochimaru's unorthodox ways of obtaining it.
In this kind of fanfiction, Naruto might first try to understand Obito's motives. He could see the pain and loneliness that drove Obito to his dark path. Maybe Naruto would try to convince Obito to give up his evil plans and return to the side of good. They could form an unlikely alliance against a common enemy, like Madara or Kaguya. Naruto's positive attitude and Obito's powerful abilities would make a very interesting combination.