One common plotline is Merlin using his age - related wisdom to save Arthur from various threats. For instance, he might have prior knowledge of a magical curse that's about to befall Arthur and uses his experience to counter it.
One common plotline is Merlin using his youth to his advantage. For example, he might be able to blend in more easily with the younger generation in the kingdom, gathering information that Arthur can't. Another is Arthur having to deal with his own insecurities about getting older while Merlin is full of energy. Also, there could be a plotline where Merlin's younger age makes him more adaptable to new magic or technologies that are emerging, and Arthur has to rely on him for that knowledge.
One common plotline could be Arthur realizing his roughness is wrong and trying to redeem himself. Another might be Merlin getting fed up and leaving, which then makes Arthur see how much he needs Merlin.
Well, leadership is a common theme. Arthur's growth as a leader and how Merlin influences that. Also, the theme of sacrifice. There are stories where either Merlin or Arthur has to sacrifice something for the greater good of Camelot. And then there's the theme of adventure. They go on quests together which helps in building their relationship in a non - romantic way.
Well, the age difference can create a dynamic where Merlin is seen as the wiser one. Since he's older, he may have different values and beliefs formed over a longer time. This could lead to some clashes with Arthur, who might be more impulsive due to his younger age. But at the same time, it can also make their bond stronger as Merlin can offer Arthur a different perspective on things.
One interesting plotline could be the knights and Arthur facing a new, powerful dark magic threat that only Merlin's unique powers can help them overcome. They might journey to a far - off land in search of a magical artifact Merlin has foreseen as the key to victory.
One common theme is friendship. Their relationship is often at the heart of the stories, showing how they support and grow with each other. Another is loyalty. Arthur and Merlin are extremely loyal to each other in the original series, and this is often emphasized in fanfiction.
One interesting plotline could be Arthur's initial shock and then his gradual acceptance of Merlin's new identity. He might start to see Merlin in a whole new light and realize how much power Merlin truly holds.
One interesting plotline could be their journey to discover their true family history. Since they are brothers in this fanfiction, there might be secrets about their parents or heritage that they uncover together. Another could be them facing challenges as brothers, like one getting into trouble and the other having to save him. For example, Arthur might get captured and Merlin uses his magic to rescue him, strengthening their bond as brothers in the process.
Magic is a big theme. Since Merlin has magic in the series, fanfictions may center around how he uses it in relation to Arthur. For example, secretly protecting Arthur with his magic. Love is also a theme that pops up. Whether it's a deep platonic love or a romantic one, it's often a part of these fanfictions. The idea of destiny is another, as they seem to be intertwined in the original story, and fanfictions might play with that concept.
One common theme is the jealousy over their respective friendships. For example, Arthur might be jealous if Merlin spends too much time with other knights. Another theme could be romantic jealousy. If there are love interests involved for either of them, it can lead to some intense jealous moments. Also, jealousy over power or status can play a part. If Merlin's magic gives him an edge in certain situations, Arthur might feel a twinge of jealousy, and vice versa.