Perhaps the fanfic could be about an Orochimaru's student who is sent on a secret mission. On this mission, they meet different characters who make them question their loyalty to Orochimaru. They could also find a hidden power within themselves that is not related to Orochimaru's teachings. This new power could be the key to their redemption or a new path away from Orochimaru.
One possible fanfic could be about a student of Orochimaru who rebels against his evil ways. This student, perhaps having seen the destruction Orochimaru causes, decides to use the knowledge he has gained in a positive way. He might start by secretly helping the Hidden Leaf Village, using his skills in jutsu and forbidden arts to protect rather than harm.
The student could go on an adventure to find a cure for Orochimaru's curse mark. Since Orochimaru often experiments with curse marks on his students, this one particular student might be determined to find a way to get rid of it once and for all. He could travel to different hidden villages, seeking out ancient scrolls and wise sages for answers.
One possible plot could be that Naruto, as Orochimaru's son, struggles with his identity. He might have Orochimaru's scientific genius but also Naruto's determination. He could be shunned by the village at first due to Orochimaru's bad reputation. But then, he uses his unique skills to prove himself, perhaps by developing new jutsu that combines Orochimaru's snake - related techniques with Naruto's own chakra - based powers.
Well, perhaps the story could be about Orochimaru seeing Harry as an interesting experiment. He might teach Harry things like advanced potions and how to handle dangerous magical creatures in a very unorthodox way compared to Hogwarts' teachings. But Harry would constantly be in a moral dilemma, whether to accept Orochimaru's teachings which are often on the edge of what is considered good magic in the wizarding world.
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.
One possible fanfic could be about a student of Orochimaru who struggles with the dark arts they are being taught. This student might start to question Orochimaru's motives as they see the harm his experiments cause. For example, they could witness the pain of the test subjects in Orochimaru's lair and decide to rebel. They might try to find a way to use the knowledge they've gained for good, like developing healing jutsu based on Orochimaru's research on the human body.
Maybe in this fanfic, Naruto has been influenced by some dark force or a traumatic event that makes him turn to Orochimaru. Orochimaru, seeing Naruto's potential, convinces him to work together. Naruto's tasks could involve helping Orochimaru in his experiments. However, as time passes, Naruto realizes the true evil nature of Orochimaru and has to struggle between the loyalty he feels due to the power he's gained and his own moral compass.
One possible plot twist could be that Orochimaru has an ulterior motive for training Sakura. Maybe he wants to use her new - found skills against Konoha in the future. Another could be that Sakura discovers a hidden power within herself during the training that Orochimaru wasn't expecting.
Naruto might learn some very dark and powerful jutsus. Orochimaru is known for his forbidden jutsu knowledge. So Naruto could become a much more dangerous fighter but also risk being influenced by Orochimaru's immoral ways.
A plot twist could be that Orochimaru's transformation into a girl is part of a larger, more complex jutsu that was set in motion long ago. In this new form, she has access to different types of chakra or abilities that she didn't have before. This makes her a target for other villains who want to use her new powers for their own gain, and Naruto has to protect her while also being cautious of her true intentions.