Naruto could develop a new sense of determination. He might be determined to not let Orochimaru's experiments define him. Instead, he could use what has happened as a motivation to become stronger in his own way. He may also start to study more about the type of experiments Orochimaru was doing, not to replicate them, but to find ways to counter any future threats related to that kind of science.
He survives through his strong will. Naruto has an unwavering determination that refuses to be broken by Orochimaru's experiments. His inner strength and the chakra of the Nine - Tails within him might also play a role in withstanding the physical and mental torture of the experiments.
It changes the Naruto universe in several ways. Firstly, Fem Orochimaru's actions would be different from the male Orochimaru's. Her motives for taking Naruto might not be as purely power - hungry. This could lead to different alliances and enmities. For example, some characters who were against Orochimaru might be more lenient towards Fem Orochimaru if she shows a more benevolent side. Secondly, Naruto's growth and development would be altered. Instead of following the path with Jiraiya, he's with Fem Orochimaru. So his jutsu and combat style might incorporate more of her unorthodox and perhaps more feminine - influenced techniques. Also, the perception of Orochimaru's lair or hideouts would change. It could be less of a spooky, evil - filled place and more of a place of mystery and potential redemption.
Naruto could also become more vengeful. If he survived the experiments, he would likely be angry at Danzo for what he had done. This could lead to a darker side of Naruto emerging, where he is focused on getting revenge rather than his original goal of becoming Hokage and being accepted by the village. He might be more willing to use force and be less forgiving.
His character could develop in a darker direction. The torture and manipulation from Orochimaru's experiments could make him question his values. However, it could also strengthen his resolve to protect his friends and the village. He may start to see the world in a more complex way, understanding that there are greater evils out there. And his newfound powers from the experiments could give him a sense of responsibility that he didn't have before.
Well, it could enhance his jutsu arsenal significantly. Orochimaru has a vast knowledge of various jutsus. Naruto might gain access to Orochimaru's snake - based jutsus like the Hidden Shadow Snake Hands. Also, Orochimaru is very proficient in forbidden jutsus. Naruto could potentially have a better understanding of these dangerous techniques, but he would also have to deal with the darker aspects of Orochimaru's power and the possible corruption it might bring to his own chakra nature.
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?
He would probably be very angry. Naruto has always been a free - spirited person, and being experimented on against his will would be a huge violation of his rights. He might initially try to resist physically, but as the situation gets more complex, he could start to plot his escape and revenge.
He probably resists. Naruto has always been a fighter. He would not just sit there and let them experiment on him without a fight. He might use his basic ninja skills like substitution jutsu to try and escape the experimenters.
It makes Naruto seem more mysterious. Since Orochimaru is a rather enigmatic and often villainous character, Naruto looking like him in the fanfiction gives him an air of mystery that he doesn't typically have in the original series. People reading the fanfiction might start to question Naruto's true nature.
Naruto's character development could be significantly altered. If Orochimaru saves him, Naruto may start to question his own beliefs about redemption. He has always believed in giving second chances, but being saved by Orochimaru could test the limits of that belief. He might struggle with whether Orochimaru can truly be redeemed or if he is just using Naruto. This internal struggle could make Naruto more introspective and less impulsive. He may also become more cautious in his relationships, not wanting to be used again. And his view of power might change too. He could see that power can be used in different ways, not just for good like he always thought, which would add more depth to his character.