You can start by looking on popular fanfiction websites like Archive of Our Own (AO3) or Fanfiction.net. Just type 'Draco is Arthur' in the search bar and you'll get a list of relevant stories. Another option is to join fanfiction communities on social media platforms like Reddit or Tumblr. People there often share and recommend good fanfics.
Well, there's 'The Arthur - Draco Equation' in which their relationship is built on mutual respect and understanding that develops over time. It delves into how they both view the wizarding society from their different perspectives and how that influences their bond. There are also some that focus on a more mentor - mentee type of relationship, like 'Draco's New Guidance' where Arthur becomes a sort of guiding figure for Draco, steering him away from the dark path he was on in the original series.
Friendship and rivalry are also prominent themes. In the original stories, Harry and Draco had a complex relationship. Now, in this new setup, that relationship gets a fresh take. They may have to work together more closely like Merlin and Arthur did, but their old grudges and differences still play a part, creating an interesting blend of friendship - building and ongoing rivalry.
Another plotline could be a time - travel scenario. Draco gets sent back in time to Camelot. He becomes an apprentice or a follower of Arthur Pendragon. He then has to learn the ways of Arthur's court, deal with the politics and magic there, and in the process, he grows as a person, bringing back some of Arthur's wisdom to his own time when he eventually returns.
There are several platforms where you can find such fanfiction. Archive of Our Own (AO3) is a great place to start. Just type in relevant tags like 'Harry as Merlin' and 'Draco as Arthur' in the search bar, and it should bring up a list of stories that match this concept.
Their relationship might start with distrust. Harry, like Arthur, may be wary of Draco, as Merlin, due to their past differences. But as they face common enemies, they begin to rely on each other. Draco's magic skills, similar to Merlin's, prove useful to Harry, and they gradually form a bond of friendship and mutual respect.
Draco might admire Arthur's leadership. Arthur led his knights and his kingdom with confidence. Draco, coming from a family with certain expectations of leadership in the wizarding world, could look up to that.
One way could be by having Draco find inspiration in King Arthur's code of chivalry. He might strive to be more noble in his actions, like Arthur. For example, he could start treating those he previously looked down on with more respect.
Well, perhaps Draco, in the role of Merlin, has a special connection to the magical creatures that he uses to help Harry. Harry, as Arthur, is trying to unite the different factions of the wizarding world. Draco's knowledge of magic, similar to Merlin's, allows him to create magical artifacts or spells that assist Harry in his quest for unity. And there could be a love story involved too, like Guinevere and Arthur, but in the context of the wizarding world with some other character and Harry.
Another theme is the exploration of their different personalities. Arthur is usually more responsible and DW can be more carefree. Fanfictions play with this by putting them in situations where their personalities clash at first but then they find a way to complement each other. For instance, in a story where they are planning a party for their parents, their different approaches initially cause problems but in the end lead to a great celebration.
Draco in these fanfictions can also display more open - mindedness. Since Ravenclaw is a house that encourages different ways of thinking, he may start to question the pure - blood ideology he was raised with. He could have conversations with Ravenclaw students that make him see things from new perspectives, like the importance of merit over blood status.