One interesting plot could be that Naruto is betrayed by the Hidden Leaf Village due to false accusations of being a spy for a powerful enemy. Banished, he then discovers new powers or allies outside the village. He might form his own group of outcasts and come back to the village to prove his innocence and seek revenge on those who wronged him.
Well, in some fanfictions, Naruto could be betrayed by someone close, like Sasuke. After being banished, he stumbles upon an ancient and forgotten ninja art. This art gives him the ability to manipulate nature in ways no one has seen before. He uses this new power to build a new life away from the village, but also to keep an eye on the village's affairs and secretly protect it from afar.
In these fanfictions, a possible plot is that the village elders, fearing Naruto's growing power, frame him for a crime he didn't commit and banish him. Naruto, feeling the sting of betrayal, wanders into a desolate land. There, he meets a reclusive and powerful ninja who trains him to master his chakra in ways he never thought possible. He then decides to use his newfound skills to expose the corruption in the Hidden Leaf Village and earn his rightful place back.
One plot idea could be that Percy is betrayed by a close friend who is jealous of his powers. This friend spreads false rumors about Percy being a threat to Camp Half - Blood. As a result, he is banished. Percy then has to prove his innocence while on his own, facing various monsters and challenges that test his strength and loyalty.
One idea could be that Naruto and Tenten are banished due to a false accusation of plotting against the village. They then have to prove their innocence while on the run. They might encounter old enemies who have also been exiled and form an unlikely alliance to clear their names.
One idea could be that the character with the Sharingan is banished due to false accusations of using its power for evil. He then has to journey alone, facing challenges and learning to control his power in new ways. Maybe he meets a group of outcasts who he befriends and together they fight against the unjust system that banished him.
One plot idea could be Naruto being banished to the world of One Piece. He could join the Straw Hat Pirates and use his ninja skills in new and exciting ways. For example, his shadow clone jutsu could be used for various tasks on the ship. Another idea is that he gets banished to the Bleach universe. He might learn about Soul Reapers and Hollows, and his chakra could be seen as a unique form of spiritual energy there. Maybe he could even train with the Soul Society to become stronger.
A possible plot could involve the banished mercenary being from a long - lost clan. The reason for his banishment was a false accusation by a rival clan. As he wanders the Naruto world as a mercenary, he discovers clues about his clan's true heritage and power. He then uses his skills as a mercenary to gather allies and resources to prove his clan's innocence and restore its honor. Along the way, he crosses paths with Naruto and his friends and they either help or hinder his quest depending on the situation.
Maybe Naruto is banished because of false accusations, and fem Sasuke feels betrayed as she thought Naruto would always be there for the village. However, Naruto's banishment leads him on a journey of self - discovery. Fem Sasuke, torn between her loyalty to the village and her feelings for Naruto, eventually decides to follow Naruto. They then face many challenges together which strengthen their bond and lead to a romantic relationship.
Perhaps Naruto, in his banished state, has some new and unique abilities that Temari is intrigued by. She decides to help him master these powers in secret. As they train together, feelings start to develop. Their relationship could then be a source of conflict between Konoha and Suna as the two villages have different views on Naruto's banishment and his newfound connection with Temari.
One plot idea could be that Naruto, after being banished, crosses paths with Kurenai who is on a solo mission. She initially has her doubts about him due to his banishment but gradually realizes he was wrongly accused. They team up to face a common enemy that threatens the village from afar. This could lead to a growing bond between them.
In 'naruto betrayed fanfiction', sometimes Naruto is betrayed by the hidden village itself. They might not support him when he needs it most, perhaps during a major battle against a powerful foe. The village could cut off his resources or even try to capture him. Also, a betrayal could come from a character who Naruto trusted to train him, but instead uses his training to turn Naruto into a weapon for their own evil purposes.
One idea could be that the banished mercenary has unique jutsu skills learned from different lands during his mercenary days. He could return to the Naruto world with a new perspective and hidden motives, perhaps trying to unite different ninja clans against a new, greater threat. Another plot idea is that he has a connection to an ancient prophecy that was thought to be forgotten, and his banishment was actually part of a grand scheme to protect him until the time was right.