Well, perhaps a plot twist could be that the elf is from a rival magical faction. Merlin's marriage to the elf then becomes a political move that he didn't initially realize. This would lead to a lot of conflict and drama as he tries to balance his love for the elf with the politics of the magical world. Or, the elf could be cursed, and Merlin has to find a way to break the curse before it affects their relationship and the world around them.
One possible plot twist could be that the elf has a hidden magical power that Merlin doesn't know about. This power could either help them in their adventures or cause some problems in their relationship. For example, it might attract the wrong kind of attention from other magical beings. Another plot twist could be that Merlin discovers that the elf is part of a prophecy that he was unaware of. This could change the whole dynamic of their relationship as they now have to deal with the implications of the prophecy.
One possible plot could be that Merlin, with his powerful magic, meets an elf in a magical forest. They initially bond over their shared connection to nature and magic. As time passes, they face challenges together, like fending off dark forces that threaten both the human and elf realms. Eventually, their love grows strong enough for them to decide to marry, uniting their two worlds in a new way.
One possible plot twist could be that they get married for a strategic reason in the wizarding world. Maybe to unite two powerful magical families or to end a long - standing feud between Slytherin and Gryffindor. Another could be that they discover a deep - seated mutual respect during their married life that they never expected, as Severus was always seen as a Slytherin outcast by James and his friends, but now they start to understand each other on a whole new level. And perhaps, in a strange turn of events, they find out that they have a common enemy that forces them to work together and this marriage becomes a key part of their plan to defeat that enemy.
One possible plot twist could be that Merlin is carrying a child with magical powers far beyond what anyone has seen. This could lead to a race among the dark forces to either control or destroy the unborn child, while Merlin's friends strive to protect him and the baby.
A plot could involve Merlin and Freya getting married in secret. Then, as they start their new life together, they discover that Freya has a special connection to a hidden realm. They must work together to protect this realm from dark forces that are trying to invade it. Their married life becomes a series of adventures as they fight side by side, using their combined magic to keep the realm safe.
One possible plot twist could be that Konan discovers a hidden power within Naruto that he's not even aware of himself. This newfound power could attract the wrong kind of attention from other ninja villages or even from some secret organization. Another twist could be that Konan's past catches up with her in a way that endangers their marriage. Maybe an old enemy resurfaces and tries to use Konan to get to Naruto. Or perhaps there's a prophecy that says their union will bring either great destruction or great peace, and they have to figure out which it will be.
One possible plot twist could be that Shikamaru is actually on a secret mission that he can't tell Sakura about, and she starts to suspect he's hiding something from her, causing tension in their marriage. For example, he might be working undercover to expose a traitor in Konoha and his secrecy makes Sakura think the worst.
A possible plot twist is that Hermione is actually on a secret mission for the Order of the Phoenix when she marries Draco. She's using the marriage as a cover to get closer to some dark wizards Draco has connections with. As they spend more time together in their 'fake' marriage, they start to truly fall for each other, which complicates things for Hermione's mission.
One possible plot twist could be that they keep their marriage a secret from the wizarding world because of the age difference between them. Hermione is much younger than Remus, and the wizarding society might not accept their union easily. Another twist could be that they got married secretly to protect each other. Maybe there's a dark force threatening them, and by being married secretly, they can use some magic spells or charms that are only available to married couples to keep each other safe.
One possible plot twist could be that the other gods oppose their marriage strongly. Since it's an unconventional union in Greek mythology, Zeus might try to stop it for fear of disrupting the order of the cosmos. Another twist could be that a powerful external force, like a primordial being, tries to use their marriage as a way to gain power over the underworld and the seas.
Well, a plot twist might be that Freya discovers she's pregnant with a special kind of magic - not just normal magic but something that is a blend of different magical realms. This causes a stir in the magical community and they have to deal with the politics and jealousy that comes with it. Also, Merlin might have to hide this fact from Arthur for a while as he fears Arthur's reaction to such a strange magical occurrence.