The plot could take a turn when the female Naruto's friends and comrades in the ninja world oppose the engagement. They believe that it will disrupt the balance of power or that the prince has some ulterior motives. So, the female Naruto has to choose between her loyalty to her friends and her love for the prince.
Well, a plot twist could be that Mei is actually engaged to Naruto as part of a long - term plan to steal some secret from Konoha. But as she spends time with Naruto, she starts to really fall in love with him. This creates an internal conflict for her as she has to choose between her village's mission and her new - found love. Or perhaps Naruto discovers some dark secret about Mei's past that makes him question their relationship, but then he realizes that people can change and that he still loves her regardless.
One possible plot twist could be that an old enemy resurfaces just as they are about to get engaged. This enemy might try to disrupt their relationship by spreading false rumors about Naruto, like he has some hidden dark power that could endanger Hinata. Another twist could be that Hinata's family has some ancient clan secret that surfaces and creates a rift between them and Naruto's side. Maybe the secret is related to a power that the Hyuga clan once had and lost, and they fear Naruto might be involved in its re - emergence in a negative way.
One possible plot twist could be that their engagement is part of a political alliance between the ninja world and the supernatural world of Rias. But then they discover a hidden conspiracy within the alliance that threatens both their worlds. So they have to work together to uncover the truth while also dealing with their growing feelings for each other.
In this fanfiction, it could be that Naruto is found to be a prince of a foreign land during one of his missions. As a prince, he is expected to marry for political alliances. However, Naruto is torn between his duties as a prince and his feelings for his friends back in Konoha. He has to find a way to balance both worlds and maybe even change the traditional ways of the foreign kingdom.
Perhaps there could be a rival who tries to break them apart. This rival could be someone from Sasuke's past who has a grudge against him and sees Sakura as a way to get revenge. They might spread false rumors about Sasuke to make Sakura question his loyalty.
Maybe there's a plot twist where Hermione discovers that Blaise has a hidden past or a secret mission that he hasn't told her about. This could put a strain on their engagement as she questions whether she really knows him. Or perhaps there's a magical curse that gets in the way of their relationship, and they have to find a way to break it in order to have a successful engagement.
One possible plot could be that Naruto, after achieving great things in his own village, travels for some reason to the world where Konoka lives. They meet by chance, and Naruto's heroic nature and kind heart immediately attract Konoka. As they spend more time together, they start to develop feelings for each other and eventually get engaged. Their engagement might face some opposition from people who don't understand their relationship, but they overcome it through their love and determination.
One possible plot could be that their villages arrange their engagement as a way to strengthen the alliance between Konoha and Sunagakure. Naruto and Temari initially resist but then gradually fall in love as they get to know each other better.
One possible plot twist could be that due to Zabuza's influence, the female Naruto becomes more of an assassin - type. She might develop a different set of values compared to the original Naruto. For example, she could be more ruthless in combat and less hesitant to take lives when necessary.
One possible plot twist could be that the female Kyuubi imparts unique jutsu knowledge to Naruto that no one else in the village has. This could make Naruto a target of envy and suspicion among his peers at first. Another plot twist might be that the female Kyuubi has a hidden agenda related to an ancient prophecy that Naruto unknowingly is a part of. This could lead to Naruto being forced to make difficult choices between his loyalty to the village and the Kyuubi's plan.