One possible plotline could be Naruto having to relearn all his ninja skills with only one arm. He might struggle at first but then discover new ways to perform jutsus, like using his legs more for balance and chakra control. Another could be his friends trying to find a way to restore his arm, leading them on a dangerous journey to find a rare artifact or a powerful healer.
In some fanfictions, Naruto losing his arm could be a sacrifice to save the village from a powerful enemy. This could lead to a story where he has to deal with the guilt of not being able to protect the village fully. His missing arm could also be a symbol of his self - sacrifice. As he tries to move forward, he might get unexpected help from an old enemy who has now changed their ways and wants to make amends.
One possible plotline could be Naruto's struggle to adapt to his new disability. He might have to relearn his ninja skills, like how to fight and perform jutsus with only one arm. This could lead to him developing new and unique techniques that rely more on his chakra control and his legs for mobility.
Maybe he was protecting someone in Wave. He's always the self - sacrificing type, so he could have put himself in harm's way to save a villager or a friend.
One interesting plotline could be that Harry forgets his magical abilities. He then has to rediscover magic in a completely new way, which could lead to him seeing the wizarding world from a fresh perspective. For example, he might start to question the norms and traditions of Hogwarts that he previously took for granted.
One possible plot development could be Naruto having to relearn his ninja skills with only one arm. He might struggle at first, but then discover new ways to use his remaining arm in combination with his chakra control. For example, he could focus more on using his legs for powerful kicks and use his one arm mainly for balance and quick jabs of kunai or shuriken. Another aspect could be the psychological impact. Naruto might feel a sense of loss and inadequacy, which could lead to some self - discovery as he overcomes these feelings and becomes stronger in the end.
One possible plotline could be that Naruto's son is kidnapped by an old enemy seeking revenge. Naruto then embarks on a journey filled with self - doubt as he struggles to find his son. He may have to face his own past mistakes and enemies he thought were long gone.
Perhaps in the fanfic, Anakin losing his arm is a turning point. Padmé, seeing his pain and the path he might be headed towards, decides to take Luke and hide away. But Anakin, consumed by his own loss and the dark side tugging at him, tries to find them. This could lead to a cat - and - mouse type of plot where Padmé is constantly on the run, trying to protect Luke from Anakin who is slowly losing himself more and more.
A great plot twist could be that Naruto's lost memories are actually a part of a seal placed on him by an ancient being. As he loses his memories, he starts to exhibit strange powers that are related to this seal. This could lead to a journey where he has to figure out not only how to get his memories back but also the origin and purpose of this seal.
Naruto might become more introspective. He has always been action - oriented, but losing his arm could force him to think more about his actions and their consequences. For example, he may be more cautious when engaging in battles.
One possible plotline could be Ruby's struggle with self - image. Losing an eye would be a huge change for her. She might have to adapt to new ways of fighting and seeing the world. Another plotline could involve her relationships. Her friends would likely be very concerned and protective, which could lead to some interesting character dynamics.
Another plotline could involve time - travel in the fanfiction. Naruto and his friends could be sent back in time to the era of the First Hokage. There, they would have to adapt to the different ways of the past while also trying to figure out how to get back to their own time, and in the process, they might change the course of ninja history.