In such a fanfiction, one possible plot could be that the villages Naruto protected during the war start to fear his power. They might see him as a threat now that the common enemy is gone. So, they conspire against him, leading to his feeling of betrayal.
One possible plot could be that the village, still shaken by Pain's attack, blames Naruto for not preventing all the destruction. They think he has some hidden connection to Pain and turn on him. Naruto, heartbroken, decides to leave the village and find out the truth about his past and the Akatsuki on his own.
Well, one possibility could be the rebuilding of the ninja villages. After the war, there would be a lot of destruction to repair. Maybe Naruto and his friends would take on leadership roles in this rebuilding process.
Perhaps Naruto forms new alliances in this 'naruto after the war crossover fanfiction'. He might team up with characters from other fictional universes who got involved because of the crossovers. They could work together to restore peace not just in his world but also in the worlds that have been connected through the crossovers.
Another reason could be political. After the war, the power dynamics in the village might have changed. There could be new leaders or groups who saw Naruto as a threat to their authority. They might have plotted to make him look bad and turn the villagers against him, causing him to feel betrayed by the very people he fought for.
One possibility could be that the wizarding world turns on Harry after the war. Maybe they start to fear his power and influence. They could spread false rumors about him being a dictator in the making. His friends might be pressured to turn away from him, and he would be left alone, feeling betrayed by those he fought for.
Perhaps his wife betrays him out of jealousy. She could be jealous of Naruto's status and the attention he gets. So she leaks some of his secret plans to the enemy. As a result, Naruto's missions start to fail and he becomes a target. He then has to face not only the external threats but also the heartbreak of his wife's betrayal. He might start to question his own judgment in choosing her as his partner.
In the fanfiction, it might be that Tsunade believes Naruto has become too dangerous. Maybe she's misled by false information about Naruto's new powers being uncontrollable and a threat to the village. So she decides to betray him to protect Konoha from a potential disaster.
Well, in some fanfictions, it could be due to political manipulation. After the war, there might be different factions vying for power. Naruto could be seen as a threat to certain groups, and they manipulate his friends into betraying him. Also, sometimes characters' insecurities can play a role. His friends might have their own personal issues and insecurities that lead them to turn on Naruto.
One possible plot could be that Naruto is somehow transported to the world of God of War. He teams up with Kratos. Naruto's jutsu and his never - give - up attitude might impress Kratos. Together, they could face a common enemy, like a new powerful demon that threatens both their worlds. Naruto's ability to sense chakra could help them track the demon, while Kratos' brute strength and combat skills would be useful in direct battles.
In 'naruto is betrayed in wave fanfic', it could be that Naruto is betrayed because of false accusations. People might believe that he's working with the enemy. His friends in the Wave mission, like Sasuke or Sakura, could turn their backs on him. They might not trust him anymore and even try to stop him from achieving his goals in the mission.