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.
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.
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.
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.
One idea could be that they grow up with a new sense of family loyalty. They might support each other in ways different from the original story. For example, Sasuke could be more open about his feelings because he has Naruto as a true brother. Another plot could be them facing challenges together that are specifically related to their adopted family status, like dealing with the expectations of their new family or protecting their new family from threats.
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.
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.
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.
Well, a plot could involve Naruto being initially ostracized in the village because of his deafness. But then, he proves his worth by using his unique perspective. Since he can't hear, he becomes extremely observant of body language. This helps him in battles and also in understanding the true feelings of people around him. He could also form a special bond with a character who is also an outcast, perhaps someone with a disability of their own, and together they change the perception of the village towards those with differences.
One idea could be Naruto going back in time and meeting his parents when they were young. He could try to prevent their early deaths or change certain events that led to the hardships in his own life. Another plot could be Naruto ending up in the time of the First Hokage, and learning the original ninja ways that were perhaps lost or changed over time. He might also have to deal with the different political situations of that era.
One plot idea could be that Naruto is a celestial being sent to the human world on a mission. He has powers far beyond what normal ninjas possess, like the ability to control the elements on a much larger scale. For example, he could stop a natural disaster by simply willing it. Another idea is that he's a spirit in a human form, and he has to find a way to return to his spirit realm while still protecting the village. This could involve him learning about his true identity through a series of mysterious encounters.