Well, it could be about Merlin embarking on a quest to find the Golden King. Maybe he has to overcome various magical obstacles and face dangerous creatures along the way. He might also meet new allies who help him in his journey.
Obviously, Merlin would be the main character. Arthur could also be involved, perhaps as someone Merlin has to leave behind or someone he's trying to protect during his journey. Morgana might be there too, either as an antagonist or a reluctant ally. And there could be new, made - up characters like a wise old wizard who gives Merlin clues about the Golden King.
Well, one possibility is that Merlin uses his magic secretly to gain the support of the people. He might perform great feats during times of crisis, like saving the kingdom from a powerful enemy. And then, through a series of events, the nobles and commoners alike start to see him as a true leader and he is finally crowned king.
The plot might also be about a threat to the kingdom. As king, Gwaine has to lead the defense, and with Merlin as his partner, they use magic and strategic thinking. Their marriage is not just a love story but also a partnership in ruling. They might face an ancient evil that only Merlin's magic can defeat. Along the way, they'd grow closer, and their relationship would be tested and strengthened as they save the kingdom.
One idea could be Merlin having to deal with the political intrigue of being a king. He might face challenges from nobles who don't trust his magic. Another could be Merlin using his magic in unique ways to improve the kingdom, like creating new irrigation systems for farmers. Or perhaps he has to form alliances with other kingdoms while hiding his true identity as a powerful sorcerer.
It could be a story where Merlin and Gwen attend a royal ball. Merlin, who is usually shy about his dancing skills, decides to ask Gwen for a dance. As they dance, they share a special moment and start to realize their feelings for each other more deeply.
One possible plot could be Merlin hiding her true identity from Meliodas as he grows up. She could be watching over him from afar, secretly guiding his actions and protecting him from afar while he is on his adventures.
Well, perhaps it could be about Merlin using his ancient and powerful magic to train Harry in combat skills. Maybe he teaches Harry spells that have been long forgotten.
In a 'Merlin and Arthur at Hogwarts' fanfiction, the story could start with Merlin accidentally casting a spell that sends them both to Hogwarts. At Hogwarts, Arthur is amazed by the magical creatures and the Quidditch games. Merlin tries to blend in but his unique abilities make it difficult. They both get caught up in a mystery within the school, like a hidden chamber that holds a powerful and ancient magic. As they explore, they discover that their fates are somehow linked to the history of Hogwarts, and they must use their combined skills - Arthur's leadership and Merlin's magic - to solve the mystery and find a way back to their own world.
Well, it could start with Merlin finding Freya in a difficult situation. Maybe she's being chased by some dark forces. Merlin uses his magic to save her and in that moment of relief and gratitude, they share a kiss. It could be a very tender and innocent kiss, filled with the start of new feelings between them.
One possible plot could be that Merlin discovers a hidden dragon lair where he is accepted as one of their own. He learns dragon magic and uses it to protect Camelot in ways he couldn't before. Maybe he even rides the dragons into battle against powerful dark forces.