One possible plot twist could be that the other gods oppose their union. Since Ares is the god of war and Athena is the goddess of wisdom, their marriage might disrupt the balance among the gods. The gods might fear that their combined powers would lead to unforeseen consequences. For example, Zeus could be worried that they would become too powerful and try to overthrow him. Another plot twist could be that there's a hidden prophecy related to their marriage. Maybe it was foretold that their union would either save or destroy the world of the gods. This would add a layer of mystery and danger to their relationship.
One possible plot twist could be that their marriage is part of a larger plan by the gods to manipulate the mortal world. For example, other gods might be using their union to gain more power or to create chaos among the mortals. Another plot twist could be that Xena discovers a hidden agenda of Ares that threatens their relationship, like he's using the marriage to get closer to a powerful weapon that only Xena can access. And finally, there could be a plot twist where an old enemy of Xena's resurfaces and tries to break up their marriage by revealing secrets from Xena's past that Ares doesn't know about.
One possible plot twist could be that the gods oppose the marriage. Since Athena is a virgin goddess in Greek mythology, her getting married would go against the traditional view of the gods. This could lead to a conflict where Percy has to prove himself worthy not only to Athena but also to the other deities.
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.
One possible plot twist could be that Hanare is actually a spy from an enemy village but has truly fallen in love with Kakashi. She has to choose between her loyalty to her village and her love for him. Another could be that just before the wedding, Kakashi discovers a long - lost family secret that makes him question whether he should get married. For example, he might find out that his family has some sort of curse that could affect Hanare.
One plot twist could be that just before the wedding, Ash discovers a long - lost Pokemon that he has to take care of immediately. This could cause him to be late for the wedding or even make him question if he can take on the responsibilities of both a Pokemon trainer and a husband. Another twist might be that Lenora's old research comes back to haunt her. Maybe a powerful Pokemon she once studied breaks free and heads towards the wedding venue, forcing Ash and Lenora to team up and stop it before they can get married.
One possible plot twist could be that Scorpios is actually from a rival family. Just as they are about to get married, an old family feud resurfaces. His family tries to stop the wedding, creating a big drama.
One possible plot twist could be that Conan's identity as Shinichi is revealed to Haibara in a very unexpected way during their wedding preparations. Maybe while looking for something old - like a family heirloom - Haibara stumbles upon evidence that clearly shows Conan is Shinichi. This would add a whole new layer of drama to their relationship as they would have to deal with this new revelation on top of their wedding plans.
One possible plot twist could be that just before the wedding, Hayate discovers a long - lost family secret that makes him question whether he is worthy of Nagi. For example, he might find out he has some sort of inheritance or a past connection to a powerful family that has been involved in shady dealings. Another plot twist could be that Nagi's financial situation suddenly changes. Maybe her family's fortune is lost due to some unforeseen circumstances like a business deal gone wrong. This would put a strain on their relationship as they have to adjust to a new life without the luxury they were used to. And a third plot twist could be that an old rival of Hayate's returns. This rival could be someone from his past who has always been jealous of Hayate and tries to sabotage his marriage to Nagi by spreading false rumors or causing trouble at the wedding.
One possible plot twist could be that Elsa discovers Hans' true motives just before the wedding. Maybe she overhears him talking about using their marriage to gain more power in Arendelle. Another twist could be that an old enemy of Arendelle tries to stop the wedding by creating chaos. Or perhaps Elsa's powers start to act up in a new and unexpected way during the ceremony, threatening to destroy everything.
One possible plot twist could be that Naruto has to face a powerful enemy right before the wedding. This enemy might be someone from his past who wants to disrupt his happiness. Another could be that Hana discovers a long - lost relative who has some secrets about her family that could change their relationship. Or perhaps there's a mix - up with the wedding arrangements, like the wrong venue being booked, which leads to a series of comical and heartwarming events as they try to fix it.