It could be Sakura. In the original series, their relationship was complex, and in fanfiction, it would be a common choice for her to be the one to dump Naruto, perhaps due to her still having feelings for Sasuke.
In some 'naruto gets dumped fanfiction', there could be a plotline where Naruto's friends try to cheer him up. They might take him on adventures or introduce him to new people. This could show the importance of friendship during tough times and how his friends can help him get over the dumped experience.
Another reason might be personal growth differences. As they grow, Percy and Annabeth may develop in different directions. Annabeth could become more focused on her academic and architectural pursuits in the fanfiction world, while Percy remains more centered on his demigod adventures. This divergence in their interests and life paths could cause Annabeth to feel that they no longer share the same connection and thus dump Percy.
He might be initially in shock. Percy has been through a lot with Annabeth, so being dumped would come as a huge blow. He could be speechless for a while, unable to process what has just happened.
On the other hand, the Avengers could become more protective of Tony. They see him as a single father and want to help him out. Thor might offer to babysit (in a humorous way) or Natasha could teach Tony's daughter some self - defense moves. This could strengthen their bond as a team and as friends.
One possible scenario in this fanfiction could be that Naruto's sister constantly interferes in his ninja training. She might think the training is too dangerous for him and tries to stop him from taking on challenging missions. For example, when Naruto is about to go on a mission to the Land of Waves, his sister could try to convince the Hokage not to send him, believing that he's not ready yet. This would add a whole new layer of conflict to the story, not just between Naruto and his sister, but also with the village's expectations of Naruto as a ninja.
A fanfiction about Naruto getting the Kusanagi could also involve a time - travel aspect. Naruto could be sent back in time and end up in the era when the Kusanagi was first created. There, he meets the original wielder and learns from them. He then brings the knowledge and the sword back to his own time, using it to defeat a great evil that was previously unbeatable.
In a Naruto fanfiction where he gets a massage, it could be a really interesting scenario. Maybe he's injured from a tough battle and the massage is part of his recovery. It could also be a way for him to relax after all the stress of being a ninja. This kind of fanfiction might explore his reaction to the gentle touch and care during the massage.
One idea could be that Naruto discovers the tanto in an ancient shinobi relic site. He initially doesn't know how to use it but with the help of Kakashi, he starts to learn. The tanto could have some special powers, like being able to cut through chakra - based defenses. This would add a new dimension to Naruto's fighting style.
No. Slavery is an immoral and unethical concept, and while it may be in a fictional fanfiction context, it still promotes a very negative idea. Naruto is a series that promotes friendship, hard work and positive values, and such a concept goes against the spirit of the original work.