A really interesting plot twist could be that their marriage is part of a prophecy. However, they both initially reject the idea of being bound by a prophecy. As they try to avoid their fated union, they end up in all sorts of crazy situations. They might meet other characters who also have a stake in the prophecy. Eventually, they realize that the prophecy doesn't control them but rather is a guide, and they fully embrace their marriage and relationship in their own way.
Perhaps a plot twist could be that a long - lost relative of either Zoro or Sanji shows up to object to the marriage. This relative could have some old grudge or a different plan for their family member. It would create a lot of drama and conflict. They would have to fight against this external force while also dealing with their own feelings for each other. Zoro would probably be more straightforward in facing the relative, while Sanji might be more conflicted between family loyalty and her new relationship with Zoro.
A really interesting plot twist could be that female Naruto is actually from an alternate dimension where she and Kakashi are already married. In this new world, things are different, and she has to figure out how to make their relationship work in this dimension too. Plus, there could be a character who is jealous of their union and tries to break them apart by spreading false rumors about Kakashi's past, which female Naruto has to deal with.
One possible plot twist could be that they face opposition from their respective clans who still hold grudges from the past. The Uchiha clan might not accept Naruto easily due to his connection to the Nine - Tails. Another twist could be that Sasuke discovers a new power within herself during their marriage that has unforeseen consequences for the village. Maybe it attracts enemies who want to steal that power.
Zoro might start to show his softer side more often. Usually, he's all about training and fighting, but with Sanji as his wife, he'd start to open up about his feelings. He could become more communicative, which is a big change for him. Sanji would become more confident in her own abilities outside of the kitchen. Zoro's belief in her as a fighter would boost her self - esteem. She might start to take on more dangerous missions and prove herself not just as a great cook but also as a strong member of the crew. And together, they would influence each other's decision - making. They'd have to consider each other's opinions more when it comes to matters regarding the crew or their personal lives.
One possible plot twist could be that Sakura discovers Kakashi has a secret past she never knew about. Maybe he was involved in some kind of dangerous mission long ago that has consequences in the present. This could put a strain on their relationship as she tries to come to terms with this new information.
One possible plot twist could be that just before the wedding, Ayame discovers a long - lost relative who has some dark secrets about Kouga's family. This relative tries to stop the wedding by revealing these secrets to Ayame. Another could be that on the wedding day, an old enemy of Kouga shows up and challenges him to a fight, putting the wedding on hold. Or perhaps there is a misunderstanding where Ayame thinks Kouga has betrayed her trust in some way, like he made a deal with an enemy for the sake of the tribe but didn't tell her.
Maybe Hikari suddenly gets an amazing job opportunity in a far - off place. This would force them to decide between following Hikari's career dreams and staying in their current comfortable life. It could lead to some really emotional and tense moments in the fanfiction.
One possible plot twist could be a long - lost relative showing up at the wedding and revealing a family secret that threatens to stop the marriage. For example, if there's a feud in the family that was hidden from Heiji and Kazuha.
One possible plot twist could be that their marriage is part of a larger plan to infiltrate an enemy organization. They pretend to be a happily married couple but are actually gathering intel. Another could be that Neo's past catches up with her during the wedding, and they have to deal with old enemies trying to disrupt the celebration.
One possible plot twist could be that they face opposition from the Hidden Leaf Village. Since same - sex relationships might not be as openly accepted in the traditional ninja world. Another twist could be that they have to go on a dangerous mission together right after getting married, which tests their new relationship. And perhaps there's a secret enemy who wants to break them apart because their union represents a new kind of hope in the village.
Well, perhaps a plot twist could be that Naruto gets cursed. This curse makes him forget all about Ino and their relationship. Ino then has to go on a journey to find a way to break the curse. Along the way, she might face many challenges and meet new characters who either help or hinder her. Or maybe there's a twist where it's revealed that Ino was arranged to be married to someone else in her family long ago, and she has to fight against the family traditions to be with Naruto.