It could be Orochimaru. He is always on the lookout for powerful specimens to experiment on or train in his ways. Naruto, as the son of the Fourth Hokage, would be an extremely appealing target for him at birth.
One possible plot could be that a powerful and secret organization kidnaps Naruto at birth to use his special chakra for their own dark purposes. They keep him hidden away, training him to be a weapon against the Hidden Leaf Village. However, as Naruto grows, he starts to question his captors' motives and tries to break free to find out about his true heritage.
If Naruto was kidnapped by Orochimaru at birth, the entire Naruto universe would be drastically different. Konoha would lose its Jinchuriki, which could lead to a power imbalance. Without Naruto, the Nine - Tailed Fox's power couldn't be harnessed for the village's protection. Also, Orochimaru might have used Naruto's Uzumaki heritage and the power of the Nine - Tails for his own dark experiments. This could have led to the creation of more powerful and dangerous entities. His Akatsuki plans might also be affected as Naruto was a key part of their overall scheme.
Naruto's character would be completely different. Instead of growing up in Konoha with the love and hate of the villagers, he would be under Orochimaru's influence. He might be more cold and calculating, as Orochimaru is not one to promote positive emotions like friendship. He could be trained to be a ruthless assassin rather than a hero who wants to protect everyone.
The potential kidnappers could be a secret society within the wizarding world that has its own agenda. They might believe that Hermione has a special power or connection that could either help or harm their cause, so they took her at birth to control that. It could also be a non - human magical being, like a centaur or a goblin, who thought that Hermione's birth was a sign of something significant in the magical world. They kidnapped her to study her or use her in their own cultural or magical practices. Or perhaps it was a wizard who had a grudge against Hermione's parents and took their child as revenge.
Naruto might be initially confused. He trusts Tsunade, so being kidnapped by her would be completely unexpected. He would probably start by asking her why she's doing this.
One possible plot twist could be that the kidnappers were actually working for a powerful dark wizard who wanted to use Hermione's intelligence for his own evil plans. Maybe they planned to brainwash her into becoming a powerful weapon against the wizarding world. Another twist could be that Hermione's real family had a dark secret and the kidnapping was an attempt to keep her away from it. For example, her family might have been involved in some sort of ancient dark magic that they didn't want her to discover. Or perhaps the kidnappers thought they were rescuing her from a prophecy that would bring doom to her if she stayed with her birth family.
One possible plotline could be that Draco kidnaps Hermione due to some dark family obligation related to her birth. Maybe there's a prophecy that involves her and his family wants to control the situation. Another could be that he's misinformed about her birth and thinks she's a threat to the wizarding world as he knew it. So, he takes her to figure out the truth.
Well, in 'naruto birth of the juubi fanfiction', it often explores the concept of the birth of the Juubi in new and creative ways. It might involve different interpretations of the chakra sources, the role of different characters in the process. Maybe some fanfictions focus on how Naruto and his friends deal with the emerging threat of the Juubi's birth, adding new plot twists compared to the original story.
Well, in general, any form of fanfiction that involves kidnapping and bondage themes can be a bit dicey in terms of ethics. In the Naruto universe, which is mainly aimed at a younger audience in its original form, such themes are far from the original intention. However, in the realm of fanfiction for an older and more mature audience who understand the fictional and consensual nature of such works in that context, it could be seen as a creative exploration of different scenarios. But it's important to note that it should always stay within the boundaries of legality and respect for the original source material.