There are also plotlines where Naruto has to fight against an inner Orochimaru - like persona. Maybe due to some dark magic or curse, Naruto starts to have thoughts and desires similar to Orochimaru. He then has to struggle to keep his true self intact while fighting this internal 'Orochimaru' that is trying to take over his mind and actions.
One common plotline is the corruption arc. Naruto starts off on his normal path but then gradually gets influenced by Orochimaru - like ideas of power. For instance, he might be tempted by the idea of using forbidden jutsu to gain an edge in battles, similar to how Orochimaru was always seeking new and powerful techniques through unethical means.
Another plotline could be the redemption of Orochimaru's methods through Naruto. In these fanfictions, Naruto might see some value in Orochimaru's way of thinking about power and knowledge. He could try to adapt Orochimaru's research in a more ethical way, like using Orochimaru's knowledge of the human body to develop new medical ninjutsu that can save lives instead of harming people.
A possible plotline could be Orochimaru's redemption. He realizes the error of his ways and joins Naruto in protecting the ninja world. He could use his vast knowledge of jutsu and forbidden arts to help Naruto against new threats.
One interesting plotline could be Orochimaru trying to use Naruto for a new experiment but Naruto ends up influencing Orochimaru instead. For example, Naruto's strong will and belief in friendship might start to make Orochimaru question his own dark path.
Well, in some 'Naruto second Orochimaru fanfiction', a possible plotline is Orochimaru's redemption arc. He could start to realize the errors of his ways after seeing the destruction his actions have caused. This might lead to him trying to help the Hidden Leaf Village in some way, perhaps by sharing his vast knowledge of jutsus and forbidden techniques to fight a greater evil. Also, there could be a plotline where Orochimaru discovers a new power source that changes the power dynamics in the Naruto world.
Perhaps Naruto starts to have a connection to Orochimaru's other experiments or creations. He might find himself in a situation where he has to either help or fight these other 'products' of Orochimaru's mad science. Also, the fanfiction could explore how Naruto's friends react to what has happened to him. Do they trust him still? Or are they afraid of what Orochimaru might have turned him into?
One possible reason could be in the realm of artistic interpretation in the fanfiction. The author might want to explore a different aesthetic or a unique plot where Naruto has some physical or behavioral traits similar to Orochimaru for shock value or to create a new kind of character dynamic.
Another plotline could be that Orochimaru is forced to train Naruto. Maybe the Hidden Leaf Village has some sort of leverage over Orochimaru. During the training, Naruto discovers some dark secrets about Orochimaru's past and his experiments. This knowledge could help Naruto in his future battles not just against Orochimaru if he turns on him, but also against other enemies who might have similar ideas. Naruto might also gain some new physical abilities from Orochimaru's training, like enhanced speed or strength.
Often, the theme of transformation is prevalent. Just like Orochimaru was known for his various experiments on himself to gain new powers and forms, a character 'just like him' in fanfiction might also be on a journey of self - transformation. This could be both physical and mental. There may also be themes related to secrecy and hidden motives, as Orochimaru was always full of secrets. And in relation to Naruto, the theme of friendship or the lack of it can be explored. Can Naruto befriend someone with Orochimaru - like tendencies? Or will their differences be too great?
One possible plotline could be Naruto being forced to serve Orochimaru due to some sort of blackmail or threat against his friends in Konoha. Maybe Orochimaru has some information that could endanger Naruto's loved ones if he doesn't comply. Another aspect could be Naruto initially pretending to serve while actually trying to find a way to take Orochimaru down from the inside. This would add an element of mystery and deception to the story.
A common theme is redemption. Since Orochimaru has done many bad things in the original series, in fanfiction with a female version, she often seeks redemption through her interactions with Naruto. Naruto's positive influence drives her to change for the better.
One common plot is redemption. Orochimaru is often shown as being redeemed through his relationship with Naruto. Naruto's positive influence makes Orochimaru question his past actions and strive to be a better person. Another plot could be a forbidden love story. Given their differences and the fact that Orochimaru was once an enemy, their relationship is considered taboo in the Naruto world, which adds an element of drama.