Another fanfiction might focus on Orochimaru's early days. It could explore his relationship with his sensei, how he got interested in forbidden jutsu in the first place, and what events led him to become the villain we know. For example, perhaps he was once a curious student who was pushed too far in his thirst for knowledge.
Another idea for a fanfiction could be a time - travel story. Naruto somehow travels back in time and meets a younger Orochimaru. He tries to prevent Orochimaru from going down the dark path. This would involve Naruto using his knowledge of the future to influence Orochimaru's decisions and change the course of history in the Naruto universe.
One interesting story could be about Naruto's journey of understanding Orochimaru's complex past. In this fanfiction, Naruto might start to see Orochimaru not just as a villain but as a troubled soul. It could show how their interactions change over time as Naruto tries to bring out the good in Orochimaru. This could involve Naruto using his own experiences of being an outcast at times to relate to Orochimaru.
One interesting Orochimaru fanfiction could be about his early days of exploring forbidden jutsu. It might show how he got drawn into the dark side of ninjutsu research. Maybe he had a mentor who initially guided him in the right direction but then something happened that led him astray.
A really cool plot might be that Orochimaru discovers a prophecy about Naruto being the key to a new era of ninjutsu. Instead of trying to take over Naruto's body, he decides to team up with Naruto. They go on a journey to find ancient scrolls that can unlock this new era. Along the way, they face many challenges and their relationship evolves from mistrust to a strange kind of friendship. Another plot could be that Orochimaru is resurrected after his death in a different form and has no memories of his past evil deeds. Naruto is the one who finds him and decides to help him start a new life, but they have to face the people who still remember Orochimaru's old self.
In some fanfictions, Orochimaru could be a mentor figure to Naruto in a different sense. He might teach Naruto some dark jutsu not to use them for evil but to understand the nature of power better. Naruto, in turn, could teach Orochimaru about friendship and redemption. But of course, this is all part of the creative world of fanfiction.
One interesting idea could be Orochimaru seeing Naruto as a unique specimen and instead of just trying to use him, he actually starts to respect Naruto's willpower. This could lead to a strange mentorship of sorts where Orochimaru teaches Naruto some of his more unorthodox jutsu in exchange for Naruto trying to help Orochimaru find a new path that doesn't involve so much darkness.
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.
There might be a fanfiction where Sakura is sent on a mission to spy on Orochimaru. Along the way, she discovers that Orochimaru has some secrets that could potentially help the Hidden Leaf Village if he were to be redeemed. This leads to a complex relationship between them as she tries to balance her loyalty to the village and the new knowledge she has about Orochimaru.
One interesting plot point could be Naruto using new and unexpected jutsus. Maybe he combines different techniques he's learned in a creative way to fight Orochimaru. For example, he might blend his Rasengan with some Sage Mode abilities in a way he hasn't done in the original series.