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.
The plot could also involve Naruto's memory loss being a result of some sort of dark magic or curse. And the male character in the Yaoi relationship has to go on a journey to find a way to restore Naruto's memories. During this journey, they grow closer and their relationship deepens in ways it wouldn't have if Naruto hadn't lost his memories. Their shared experiences during this time create a stronger emotional bond between them.
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.
One possible plot twist could be that Percy forgets not only his past but also his special abilities. So he has to relearn everything from scratch, and in the process, discovers new and unexpected powers within himself. This could lead to him being seen as a threat by some and a savior by others in the fanfiction world.
A plot twist could be that Naruto finds out through Tobirama's memories that there was a secret alliance that Tobirama had made with another village long ago, and this alliance was supposed to be kept hidden. But now, Naruto has to figure out how to handle this information without causing chaos between the two villages. Another possibility is that Tobirama's memories show Naruto a different side of some of the village elders, a side that is more sinister. This could make Naruto question who he can really trust in the village and lead to a whole new set of power struggles and investigations within the fanfiction.
One interesting plot twist could be that Naruto is brainwashed into believing his friends are his enemies. So he starts to attack them, but then there are hidden memories that start to resurface during a crucial battle, making him question the brainwashing. This creates a moment of internal struggle within Naruto, which is a great source of drama.
One interesting plot twist could be that the Kitsune endows Naruto with unique fox - like powers that are different from his normal chakra. For example, he might be able to communicate with other fox - related spirits in the forest. Another twist could be that the Kitsune's upbringing makes Naruto more in tune with nature, so he has an easier time learning certain types of jutsu related to the elements. And perhaps, due to the Kitsune's influence, Naruto has a different view on the concept of family, leading to some interesting interactions with his friends who have more traditional family structures.
Maybe Naruto is resurrected by an unexpected force, like an ancient and forgotten jutsu that was thought to be lost. This could lead to a whole new arc where he has to figure out who resurrected him and why, while also dealing with the fact that the world has changed since his death.
One interesting plot twist could be that the kidnappers are actually being controlled by an old enemy of the Hidden Leaf Village who has a personal vendetta against Naruto. Maybe they plan to use him as a bait to draw out the Hokage. Another twist could be that Naruto is kidnapped by someone he trusts, like a seemingly friendly ninja from another village who has a secret agenda.
One interesting plot could be Naruto forgetting all his ninja skills. So he has to start from scratch, relearning basic jutsus. This would make for a great character development arc as he discovers his old abilities in new ways.
One interesting plot twist could be that Naruto discovers he has a hidden power from a long - lost clan that changes the course of the final battle. This power might be something that gives him an edge against a seemingly unbeatable foe.