It could be about Fem Orochimaru having a different relationship with Naruto. Maybe she sees him as a potential ally or apprentice in a new way compared to the original Orochimaru.
You can try searching on fanfiction websites like FanFiction.net or Archive of Our Own. Just type in 'Fem Orochimaru Naruto' in the search bar and you'll likely find some relevant fanfictions.
One possible fanfiction could involve Fem Orochimaru seeing Naruto as a unique specimen. Maybe she's intrigued by his unwavering will and the power of the Nine - Tails within him. She might try to get closer to him in order to study his power source. For example, she could disguise herself and join Naruto on some of his missions, all the while observing him secretly.
A simple plot could be that Fem Orochimaru wants to use Naruto's chakra for her own gain. She tries to capture him but Naruto always manages to escape. Each encounter makes her more obsessed as she realizes how powerful Naruto truly is.
Well, Orochimaru's immortality would mean that his influence would be long - lasting. He could continue to conduct his unethical experiments over a very long period. This might lead to the creation of new and dangerous ninja techniques or even new forms of life. In the long run, it could change the way ninja are trained and how the ninja world views power and knowledge. For example, some might start to see immortality as the ultimate form of power and strive for it at all costs. Naruto and his friends would have to constantly be on guard against Orochimaru's schemes.
In this kind of fanfiction, Naruto might have used his new and powerful jutsu that he developed secretly. Maybe it was a super - enhanced Rasengan with some special chakra nature added to it, which was strong enough to overpower Orochimaru.
Since Orochimaru had many experiments and secrets, his death at Naruto's hands in the Chunin Exams fanfiction could lead to a scramble for his research. Other villages or even some rogue ninjas might try to steal his notes and facilities. In Konoha, Naruto might be pressured to reveal what he knew about Orochimaru's plans and secrets. This could put him in a difficult position as he may not know everything. Also, Sasuke, who had a connection with Orochimaru, might have a complex reaction. He could be angry at Naruto for killing Orochimaru, or he could see it as a sign of Naruto's strength and be motivated to become stronger himself.
Sakura can resist Orochimaru's influence through her strong will. She has always been a determined character in the Naruto series. Her love for her friends and her village could serve as a powerful motivation to not give in to Orochimaru. She could also use her medical ninjutsu skills. Maybe she could develop a way to counteract any mind - altering substances or jutsu that Orochimaru uses on her. Another way is by relying on her own combat skills. If she can keep Orochimaru at bay physically, she has a better chance of avoiding his psychological and physical manipulations.
One characteristic is that they often explore Orochimaru's complex personality. Since he is a morally ambiguous character, fanfics usually dig deeper into what makes him tick. Another is that they might introduce new and unique plotlines related to his experiments or his search for power.
In a fanfiction like this, Orochimaru could train Naruto in the ways of stealth and assassination, skills that Orochimaru is quite proficient in. Naruto would initially be hesitant but realizes that these skills can be used for good. For example, to infiltrate enemy bases and gather intelligence to prevent wars. This would change Naruto's fighting style and make him more versatile in the shinobi world.