The plot twist might be that Sakura is forced to marry this person to save her village or loved ones. She doesn't love him but has to go through with it for the greater good. As the story progresses, she could find unexpected qualities in him that make her question her initial feelings. Or perhaps the person she truly loves comes back just as she's about to say 'I do' and there's a big showdown between the two suitors.
One possible plot twist could be that the person Sakura is marrying is actually under a spell. For example, an enemy might have cast a love spell on him to get close to Sakura for some devious plan. Another could be that Sakura discovers at the last minute that the man she's about to marry has a hidden identity. Maybe he's a long - lost relative of an enemy she thought she had defeated. It would add a lot of drama to the story.
Well, perhaps the person she marries is from a different dimension. This would bring in elements of exploring new cultures and powers. The marriage could be a political move to unite two very different groups. And Bulma, being Bulma, would have to navigate through all the new and strange things that come with this situation. It could also lead to her having to choose between her old life and this new one she's been thrust into.
One possible plot twist could be that the new marriage is a political alliance. For example, if he marries a noblewoman from a far - off land, it could bring new resources and allies to his kingdom. This would create a whole new set of power dynamics as different factions within the court would either support or oppose the new alliance.
A plot twist could be that Sakura and Hinata actually team up against Naruto in some way. Perhaps they realize that Naruto is being pushed into a relationship by the village elders for political reasons. So, they decide to fake a relationship between themselves to make Naruto see that he should be free to choose his own path and not be pressured into a marriage. This would turn the typical love triangle on its head.
Well, it could be a story where Sasuke saves Sakura from someone else who might be a threat. Maybe it's an enemy from another village or a rogue ninja. Sasuke, with his powerful skills, steps in to protect Sakura.
Well, it could be a new character introduced in the fanfic. Maybe a mysterious stranger who has some special charm that attracts Sakura.
Maybe it could be her long - time rival. This would be really unexpected because they've always been at odds. But perhaps there was some hidden admiration or understanding between them all along that they didn't realize until later. It would completely change the dynamic of their relationship from enmity to love, which would be a very interesting turn of events in the fanfic.
It could be a jealous rival. Maybe there's another ninja who has feelings for Sakura and is trying to keep her away from Sasuke. So Sasuke has to catch her to prevent this rival from taking her away.
Maybe she kisses one of her rivals in a competition. This could be a way to throw the rival off - guard or perhaps it's a moment of sudden understanding between them that leads to the kiss. For instance, if they are in a magical competition and Sakura realizes that the rival has a side to them that she never noticed before, and in a moment of impulse, she kisses them.
One possible plot twist could be that Orochimaru has an ulterior motive for training Sakura. Maybe he wants to use her new - found skills against Konoha in the future. Another could be that Sakura discovers a hidden power within herself during the training that Orochimaru wasn't expecting.
First, introduce the fiancé. Is he from a different world? Is he a rival? Then, show Sakura's initial reaction. Is she happy, confused, or forced? Next, add some conflict. Maybe her friends don't approve, or there are some secrets about the fiancé. For example, if he's from an enemy clan. Also, include some internal conflict for Sakura. Does she really love him? Or is she just doing it for some other reason? Finally, build up to a climax where she has to make a decision about the engagement.