One possible plot twist could be that an ancient curse is revealed just before the wedding. This curse might be related to their different spiritual powers and threatens to tear them apart. For example, it could cause Toshiro to lose his ice powers, which are an essential part of his identity, and he might feel unworthy of Rukia. Another plot twist could be the interference of a powerful enemy. Maybe a rogue Soul Reaper who has a vendetta against Toshiro's division decides to use the wedding as an opportunity to strike. They could try to kidnap Rukia to lure Toshiro into a trap. Or perhaps a discovery that their marriage has been pre - ordained by some higher spiritual force for a greater purpose, like saving the Soul Society from an impending doom, and they have to quickly come to terms with this new - found responsibility.
Well, a plot twist could be that one of them loses their powers right before the marriage. For example, if Ichigo loses his Soul Reaper powers, he might start to doubt if he can protect Rukia and their future together. Or perhaps Rukia is suddenly called back to Soul Society for an important mission that she can't refuse, and it's a mission that might keep her there for a very long time, putting their relationship to a hard test. Also, there could be a new character introduced who has a mysterious connection to either Ichigo or Rukia and tries to disrupt the wedding.
One possible plot could be a post - battle scenario. After all the chaos and fighting they've been through, Ichigo realizes his true feelings for Rukia. They start to secretly date while trying to maintain their duties as Soul Reapers and protectors of the living world. Eventually, their friends find out and support them wholeheartedly. They plan a simple yet beautiful wedding in the Soul Society, with all their friends and comrades in attendance, and they live happily ever after, constantly going between the Soul Society and the living world to visit their loved ones.
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.
A third plot twist could be the appearance of an old enemy from either of their worlds. For instance, if one of Naruto's old foes teams up with an enemy from Esdeath's world. They would then have to put aside their differences and work together to defeat the common enemy, which could either strengthen or strain their marriage.