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.
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.
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.
One great hermione and arthur fanfiction is 'A Different Kind of Bond'. It explores an unlikely friendship that slowly turns into something more. Another one could be 'Unexpected Allies' which shows them working together on a complex magical project. There's also 'Shared Secrets' where they discover they have more in common than they thought.
One great 'dark arthur fanfiction' is 'The Fall of Camelot'. It explores Arthur's descent into a darker version of himself due to a powerful curse. Another is 'Darkness within the King' which delves into Arthur's inner turmoil and how it affects his rule. And 'Arthur's Shadow' shows a more menacing side of Arthur as he battles against his own dark nature.
There's also 'Merlin's Hidden Power'. In this story, Merlin discovers a long - lost power within himself while still remaining loyal to Arthur. The fanfiction focuses on how their bond grows even stronger as they face political intrigue in Camelot. It has a lot of action scenes and emotional moments between the two characters.
One great Merlin Arthur fanfiction could be 'The Bond Beyond Magic'. It focuses on their relationship growing stronger as they face new magical threats together. Another is 'Arthur's Discovery' where Arthur slowly uncovers Merlin's true power and the depth of his loyalty.
Another aspect often explored in fanfiction is the power dynamic. Given Arthur is a king and Merlin his servant, fanfictions may play with this, like Merlin having to hide his true power from Arthur at first but later using it to save Arthur's kingdom, which then leads to a shift in their relationship.
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.