How about a fanfiction where Orochimaru is transported to a different dimension where ninjutsu doesn't exist? He has to adapt and use his wits and knowledge in a completely new way. This would be a great way to explore his character without any adult themes. Or a story where Orochimaru tries to atone for his past sins by helping to rebuild a village that he once destroyed, showing a different side of his complex character.
One idea could be an Orochimaru crossover with the Harry Potter universe. Orochimaru could be a dark wizard from a far - off land who comes to Hogwarts seeking ancient magic. He might try to corrupt some of the students with his snake - like ways and thirst for power.
How about a story where Orochimaru, in a strange turn of events, has lost his memory. Sakura, being the medical ninja she is, is tasked with helping him recover. As she tries to bring back his memories, she discovers parts of his past that she never knew and has to decide whether to keep these secrets or expose them. It would be a story full of mystery and moral dilemmas.
Well, perhaps the OC son of Orochimaru could be in a situation where he is forced to choose between following his father's evil ways or siding with the ninja world to stop Orochimaru once and for all. He could have a unique ability, say, the power to communicate with all kinds of snakes and use this to his advantage in battles or in diplomatic situations. He might also meet some old enemies of Orochimaru who initially distrust him but then come to see his potential for good.
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.
A plot could revolve around Orochimaru being forced to protect Naruto for some reason. Maybe there is a powerful enemy that is after Naruto and Orochimaru has to keep him safe because of some hidden agenda related to the balance of power in the ninja world. This would lead to a series of adventures where Naruto starts to see Orochimaru in a different light, not as a pure villain.
Well, perhaps there could be a plot where they both get trapped in a mysterious dimension. In this dimension, they have to rely on each other's skills. Jiraiya's knowledge of sage mode and Orochimaru's various jutsu could be combined to find a way out. It could also explore their relationship in a more in - depth way as they face different challenges together.
Well, a plot could revolve around Orochimaru and Sasuke going on a journey to find a rare ingredient for a powerful elixir. Along the way, they encounter different enemies and allies from the Naruto universe. They might also have to face their own inner demons during this journey. For example, Sasuke has to deal with his lingering hatred while Orochimaru has to confront his thirst for power in a new way.
One idea could be Orochimaru taking an unexpected interest in Naruto's growth not for his power but for his unique way of seeing the ninja world. Maybe Orochimaru starts to secretly guide Naruto in some unorthodox ways of chakra control, which Naruto initially resists but later realizes could be useful.
One plot idea could be Orochimaru finding a way to truly achieve immortality that doesn't involve body - hopping. Maybe he discovers an ancient jutsu that links his soul to the very essence of the ninja world. Another idea is Orochimaru teaming up with Naruto to face a new, greater threat, and in the process, Naruto starts to understand Orochimaru's pursuit of immortality from a different perspective. And perhaps Orochimaru could create a new form of immortality that is more about passing on his knowledge and skills in a unique way rather than just living forever physically.
Perhaps Orochimaru's experiment accidentally releases an ancient evil that was sealed long ago. Naruto, being the hero he is, takes it upon himself to reseal the evil. Along the way, he discovers secrets about his own family and the origin of chakra that are linked to Orochimaru's experiment.