Some of the more traditional ninja elders might oppose Naruto's decision. They could think that Naruto, as a busy ninja, doesn't have the time to take proper care of a baby. They might be worried that it could affect his performance in important missions.
Some of the more traditional pure - blood families in the wizarding world might oppose it. They could think that Harry, as a single man, is not fit to raise a child properly. Also, certain members of the Ministry of Magic who are strict about family regulations might be against it at first.
The baby could be the child of a fallen ninja. Maybe the ninja was an ally of Naruto's and before dying, entrusted Naruto with the baby. This would add an emotional depth to the story as Naruto would feel a great sense of responsibility to raise the baby well.
Some of the more traditional pure - blood families might oppose it. They have strict ideas about family and bloodlines, and Harry and Hermione's situation doesn't fit into their narrow view. For example, the Malfoys might initially be against it, seeing it as a break from the 'normal' wizarding family structure.
A hermit who lives in seclusion near the chasm might save him. This hermit could be an ex - ninja who has given up on the world but still has a kind heart. He would then take Naruto in and start training him in his own unorthodox ways, which could include using the natural elements of the chasm area in combat.
Well, one possible plot could be that Naruto discovers an orphaned baby during one of his missions. He decides to take the baby in because he understands what it's like to grow up without parents. He then has to learn how to take care of a baby while still being a ninja. Maybe he gets help from his friends like Sakura who gives him medical advice for the baby's health, and Kakashi who gives him some wisdom on raising a child.
One possible plot could be Sasuke finding Naruto as a baby, perhaps after some great disaster in the village. Sasuke, having changed his views, decides to take Naruto under his wing. He then has to deal with the challenges of raising a child while also facing the judgment of the village.
Protection is also a big theme. Naruto is always protecting Sasuke in these stories, whether from external threats or from Sasuke's own inner demons. It's like Naruto is a shield for Sasuke. And friendship is there too. Even though Naruto is in a father - like role, the essence of their friendship from the original story is still there, just in a different form.
Well, it could be that Itachi sees the potential in baby Naruto and decides to protect him from the dark forces in the ninja world. Maybe Itachi wants to raise Naruto to be a powerful and kind - hearted ninja, away from the hatred that plagues their village.
One possible plot could be that Kurenai, seeing Naruto as a lonely and neglected baby, decides to take him in. She could then start teaching him basic ninja skills from a very young age. Naruto would grow up with a mother - like figure in Kurenai, which would change his personality in some ways. He might be more confident and less of a prankster as he has the love and support he needs early on.
The story could also focus on how Kakashi's decision to adopt Naruto affects the village's perception of Naruto. People might start to see Naruto in a different light, not just as the Jinchuriki but as Kakashi's son. This could lead to Naruto having a more positive experience growing up in the village, with less ostracism. Kakashi would have to navigate the politics of the village while also raising Naruto, which could add a lot of interesting twists to the plot.