A plot twist could be that an old enemy of Yoruichi resurfaces, seeing their marriage as an opportunity to get revenge. This enemy could be someone from her past in the cat clan or a Shinigami she had crossed paths with before. Now, Yoruichi and Ichigo not only have to plan their wedding but also defend themselves and their loved ones from this new threat.
One plot twist could be that they face opposition from the Soul Society. Since Ichigo is a substitute Soul Reaper and Yoruichi has a complex history there, the elders might try to stop the marriage for political or traditional reasons.
Well, a really interesting plot twist could be that Yoruichi is actually a reincarnation of an ancient soul that was once bound to Ichigo's family in a very different way. And their marriage is a way to restore some sort of balance in the world of Bleach. Also, what if Ichigo suddenly starts to lose his powers during the wedding preparations? It could be due to some sort of curse or a side - effect of their impending union. Then they have to figure out how to get his powers back without cancelling the wedding.
A plot twist might be that Ichigo discovers some long - hidden family secret related to Byakuya during their marriage preparations. This secret could change the way he views Byakuya and their relationship, adding a layer of complexity and drama to the story. For example, it could be related to a past event that involved their ancestors.
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.
A plot twist might be that Rangiku discovers a long - lost family secret just before the wedding. For example, she could find out that she has a connection to a powerful and mysterious clan that has some sort of vendetta against Ichigo's family. This would put a strain on their relationship as they try to figure out how to deal with this new information.
One possible plot could be them adjusting to married life while still dealing with the spiritual world threats. Maybe Ichigo is trying to balance his duties as a protector and a husband, and Yoruichi is using her experience to guide him in both aspects.
One possible plot twist could be that Yoruichi's love for Ichigo is forbidden in the Soul Society. Maybe there are rules against such relationships between different 'classes' or species. For example, Yoruichi being an ex - captain and Ichigo being a human - turned - Soul Reaper - substitute. This could lead to a lot of drama as they try to hide their feelings from others.
One possible plot twist could be that Ichigo struggles to control the Sharingan at first. Since he's not from the Naruto universe originally, the sudden addition of the Sharingan's powers might be overwhelming. He might accidentally activate it during battles in the Bleach world and it could give him an edge in seeing his opponents' moves more clearly, but also make him a target as it's an unknown power in his world.
One possible plot could be that Ichigo, after all his battles and growth, realizes his deep connection with Unohana. They start off as comrades who respect each other's strength. As they spend more time together, they discover their shared values and interests. Maybe Ichigo is drawn to Unohana's calm and collected nature, and Unohana sees in Ichigo a new kind of strength. Their relationship could develop slowly, with small moments of kindness and understanding leading to a deeper love. Eventually, they decide to get married, much to the surprise and joy of their friends in the Soul Society and the human world.
Well, the plot might involve some kind of prophecy or destiny that links Ichigo and Kukaku together. Maybe there's a mysterious force in the Soul Society that decrees they should be together. Their relationship could start with a shared adventure, like they have to team up to fight a powerful enemy. During this time, they start to understand each other on a deeper level. For the wedding, it could be a grand affair with all of Ichigo's friends from Karakura Town and Kukaku's allies in the Soul Society coming together. There could be some comical moments too, like Ichigo trying to understand the complex wedding traditions of the Soul Society.