Another interesting plot could be that Naruto is adopted by a family of civilians in the Hidden Leaf. They don't understand the shinobi world fully but they love Naruto unconditionally. Naruto then has to balance his ninja training with protecting his new family from the dangers that come with being associated with a ninja. He might also use his new family's values, like kindness and hard work, to change the way some of the shinobi in the village think.
Maybe Naruto is adopted by a family outside of the Hidden Leaf village. This would force him to adapt to a new culture and way of life. He could learn different chakra - control techniques or even new forms of ninjutsu that are specific to that village. It could also create a conflict when the Hidden Leaf needs his help but he has loyalty to his new home as well.
Another plot could be that Naruto is adopted by an older ninja who has retired from active duty. This ninja has a lot of wisdom and secrets. Under his guidance, Naruto discovers a new power within himself that was hidden all along.
One idea could be that Naruto is adopted by a powerful but reclusive shinobi. This shinobi could teach Naruto unique and forbidden jutsu, which would set him on a different path in his ninja journey. Another plot could involve Naruto being adopted by a family outside of the Hidden Leaf Village, and he has to learn to adapt to a completely different ninja culture. He could also bring some of the Leaf Village's values to this new place and cause a stir.
One idea could be that Naruto is resurrected in a world where all his friends have forgotten him. He has to re - establish his relationships while also dealing with a new threat that emerged in his absence.
One idea could be that Naruto has to find new ways to communicate his strong will and determination without speaking. Maybe he uses sign language that he invents himself, and his friends gradually learn to understand him. This could lead to some really heartwarming moments of connection.
Perhaps Harry is adopted by a Muggle family who are aware of the wizarding world. They could be a family of scientists who study magic from a scientific perspective. Harry would grow up with a unique understanding of magic, seeing it both as a wonder of the wizarding world and something that can be analyzed. This might make his time at Hogwarts very interesting as he tries to blend these two views of magic.
One plot idea could be that they discover their brotherhood early on and train together more closely. They might combine their unique abilities, like Naruto's Rasengan and Sasuke's Chidori, to create new and powerful jutsus. This could change the whole dynamic of the story, with them facing challenges as a united front instead of rivals.
One idea could be that they are adopted by a powerful but reclusive wizard. This wizard has his own motives for taking them in, like using their potential for a grand magical plan. Another plot could be that they are adopted into different families at first and then reunite later, realizing they have a special bond that goes beyond blood relations. Maybe they discover that their adoption was part of a prophecy protection mechanism, to keep them safe from the dark forces that are after them.
A possible plot could involve Percy being adopted by Hera and suddenly having access to new powers or abilities that come with being associated with her. But these powers come with a price. He has to perform certain tasks for Hera. Along the way, he meets other characters from Greek mythology that he wouldn't have interacted with otherwise, like some of Hera's more loyal servants or creatures. This could lead to all sorts of adventures and challenges as Percy tries to balance his old life and his new one under Hera's wing.
Well, one plot could be that fem Naruto is adopted by a group of wandering ninjas. They teach her unique and unorthodox ninja skills. She then uses these skills to help her when she finally returns to Konoha and has to prove herself to the skeptical villagers.
Another plot could be that Naruto's adopted mother is secretly related to one of the main antagonists. She has to hide this fact from Naruto while also trying to guide him to be a great ninja. This creates a lot of internal conflict for her and also adds an interesting layer of mystery to the story as Naruto might start to notice some strange behavior from her.