If Naruto were to join Orochimaru in fanfiction, it would be a huge deviation from the original story. Naruto's values of loyalty and friendship would be put to the test. He might start to see the world from Orochimaru's perspective, which is often self - serving. This could also mean that Naruto would be involved in Orochimaru's plans to gain immortality, perhaps even becoming a part of his body - swapping experiments in some extreme cases.
In this type of fanfiction, it might also be that Naruto joins Orochimaru to spy on him. The Hidden Leaf Village realizes they need to know Orochimaru's plans from the inside. Naruto, being the brave and somewhat reckless one, volunteers for the mission. He endures Orochimaru's experiments and teachings while secretly sending information back to the village. Eventually, when the time is right, he betrays Orochimaru and uses the knowledge he gained against him.
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.
The story could develop in a dark direction. Naruto might start to learn Orochimaru's jutsus. His personality could become more cynical. He'd be cut off from his usual support system in Konoha.
Well, perhaps in this fanfiction, Naruto joins Sasuke because he realizes that the village's way of handling things isn't always right. Their bond could be so strong that Naruto decides to side with Sasuke against all odds. They could start a new journey to find a better solution for the ninja world's problems, like the cycle of hatred among clans. And along the way, they meet new characters or face old enemies who now see them as a united and dangerous force.
One possible plot could be that Naruto, feeling ostracized in Konoha due to his jinchuriki status, decides to join Orochimaru. Orochimaru, seeing Naruto's potential, trains him in some dark and forbidden jutsus. Naruto might start to change, becoming more cynical. He could use his newfound powers against those in Konoha who once shunned him, leading to a series of battles between him and his former friends like Sasuke and Sakura.
In fanfiction, the relationship between Sasuke and Orochimaru is often complex. Orochimaru saw Sasuke as a vessel for his own resurrection or as a powerful tool. Sasuke, on the other hand, initially sought power from Orochimaru to avenge his clan. However, Sasuke was always cautious and didn't fully trust Orochimaru. This dynamic creates a lot of interesting plot points in fanfiction, such as Sasuke's internal struggle between his desire for power and his awareness of Orochimaru's true intentions.
It could be an old enemy who has resurfaced, like Orochimaru again. Since Naruto and Sasuke are together now, Orochimaru might see them as a threat to his own plans for power and immortality.
In fanfiction, Naruto joining Orochimaru could make him a more complex character. He'd be exposed to Orochimaru's unethical practices, which could make him question the ninja world's values. He might develop a darker side, but also a deeper understanding of the gray areas. Sasuke would experience a transformation too. His relationship with Orochimaru would be a strange mix of mentorship and power struggle. He could become more ruthless, but also more calculating. His interactions with Naruto in this new setting would be full of tension and moral dilemmas.
The interactions between Sasuke and Orochimaru in fanfiction are significant as they drive character development. Sasuke's time with Orochimaru makes him more ruthless and power - hungry at first, but also more aware of the darker side of the ninja world. For Orochimaru, Sasuke is a key part of his plans, and his pursuit of Sasuke shows his ambition. Their interactions can also lead to different plot twists, like Sasuke turning against Orochimaru earlier or later than in the original story.