In fanfiction, Arthur might be rough with Merlin because of a prophecy or a pre - ordained fate. He might think that by being tough on Merlin, he can prevent some bad outcome that he believes is related to Merlin. For example, if there's a prophecy that Merlin will bring great change to Camelot, Arthur might be rough in an attempt to keep things as they are, out of fear of the unknown.
One story could be where Arthur's roughness is a result of his insecurities. He might be rough in his training methods with Merlin, but it's because he's worried about Merlin's safety in battles. So, he pushes him hard. Another could be a plot where Arthur is under a spell that makes him act rough towards Merlin, and Merlin has to find a way to break the spell while still being loyal to Arthur.
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.
In such a fanfiction scenario, the roughness can have various impacts. It could create a sense of tension and conflict in their relationship. Merlin might start to question Arthur's true feelings towards him. But on the other hand, this rough treatment could also be a sign of Arthur's internal struggles or misunderstandings. Maybe he's dealing with his own insecurities or pressures and taking it out on Merlin in the wrong way. As the story progresses, this could be a catalyst for character growth for both of them, with Merlin learning to stand up for himself and Arthur learning to be more empathetic.
The banter between Merlin and Arthur in fanfiction is really interesting. It can range from light - hearted jabs at each other's habits. Merlin might poke fun at Arthur's love for jousting and how he always gets a bit too competitive. Arthur could retort by mentioning Merlin's clumsy attempts at serving him. Their banter also reflects the underlying respect they have for each other despite their different social standings. It's like a friendly sparring that keeps their relationship dynamic.
The 'Redemption' trope is also seen in some fanfictions. Maybe Arthur has made some mistakes in the past, and Merlin helps him to redeem himself. Or vice versa. It's a way to explore the characters' growth and development. And then there's the 'Battle Against Evil' trope where they fight side by side against dark forces, which really showcases their bond and loyalty.
I really like 'The Sword in the Stone' as a fanfiction - like take on Merlin and Arthur. It shows Merlin as this wise and mysterious figure guiding Arthur on his journey to become king. There are also some great interactions between the two characters that show the deep bond they share. You can find it in many libraries or online bookstores.
Merlin would likely be seen as a bit of an enigma at Hogwarts. His magic is different from the norm, so he might be a bit of an outsider at first. But his kind heart and loyalty would soon win over his classmates. Arthur would be the brave and headstrong character, perhaps a bit like a Gryffindor version of his usual self. He'd be eager to learn about combat magic and would probably be a natural leader in group projects or Quidditch teams.
During the time of Merlin's captivity, they could have long conversations that they never had before. Arthur might open up about his insecurities regarding magic and his kingdom, and Merlin could share his true feelings about serving Arthur. This would strengthen their bond in a new and unexpected way.
It could start with a slow realization of their feelings. Maybe they were friends for a long time and then suddenly, one day, they look at each other in a new light. After getting married, they become more protective of each other. Arthur might become more open to Merlin's magic, and Merlin would be more involved in Arthur's political decisions.