One possible plot twist could be that an old enemy resurfaces during their wedding preparations. For example, a powerful dark cultivator who was thought to be defeated long ago comes back to seek revenge. This would put Lan Zhan and Wei Ying in a difficult situation as they have to protect their loved ones and their future together. They might have to postpone the wedding and face this new threat head - on.
One common theme is their strong friendship and how it evolves into something more. Another is the adventures they go on together, fighting against evil forces.
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The plot you mentioned might be from the online novel " Demonic Ancestor " written by Mo Xiang and Tong Chi, which was also adapted into an anime of the same name. In this plot, Wei Ying didn't let Lan Zhan eat spicy food in order to help him quit drinking. However, Lan Zhan wanted to eat chili, and Wei Ying refused him.
One popular 'lan zhan and wei ying fanfiction' is 'The Untamed: A New Beginning'. It explores their relationship in a new and exciting adventure. Another one could be 'Lan Zhan and Wei Ying's Hidden Journeys' which delves deeper into their emotional bond.
Perhaps Ino's ex - boyfriend shows up and tries to win her back. This would create a lot of tension as Sai would have to fight for Ino's love and prove that he is the better choice for her. It could also make Ino re - evaluate her feelings for both men.
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.
One possible plot twist could be that their families, who initially opposed the marriage, suddenly come around due to an unexpected event. For example, a family member might fall ill and realize how much Mei and Yuzu love each other during the difficult time. Another plot twist could be that there's a misunderstanding that threatens to break up their marriage plans. Maybe someone spreads false rumors about one of them, but they eventually clear it up through honest communication. A third plot twist could be that a long - lost relative shows up and has some strange conditions or secrets related to their union.
A plot twist could be that Ayame is actually part of a prophecy related to Naruto. For example, their marriage is foretold to bring either great prosperity or great disaster to the Hidden Leaf Village. This makes their relationship more than just a love story and puts a lot of pressure on them, as they have to figure out how to fulfill the prophecy in a positive way.
A plot twist could be that Inuyasha is forced to choose between Kagome and saving his friends. Some dark force could put his friends in danger and the only way to save them is to break off his marriage to Kagome. This would create a huge conflict for him as he loves Kagome but also values his friends deeply. Also, Kagome might come from a future where she is suddenly called back and has to find a way to either stay in the past with Inuyasha or go back to her own time, leaving him behind.
Maybe a plot twist is that Jacob has a long - lost relative who shows up just before the wedding. This relative has different ideas about Jacob's future and doesn't approve of his marriage to Renesmee. He tries to persuade Jacob to break off the engagement, which causes a rift between Jacob and Renesmee as they deal with this unexpected interference.