One interesting Arthur Pendragon OC fanfic could be about an OC who is a powerful sorcerer from a far - off land coming to Camelot. They initially face suspicion but end up helping Arthur in a great battle, using their unique magic skills. This kind of story can add new elements to the Arthurian legend.
There are also fanfictions where the OC is a commoner with a hidden noble lineage. In this story, as they interact with Arthur, they gradually discover their true heritage. This kind of plot often involves a lot of character development for both the OC and Arthur as they navigate through their new relationship while dealing with the court politics and the threat of Morgana.
To create a good Arthur Pendragon OC fanfic, you need to pay attention to the writing style. Use descriptive language to bring the world of Camelot to life. Describe the castle, the forests, and the people. When writing the interactions between the OC and Arthur, show rather than tell. Let the readers feel the tension, the friendship, or the conflict through their actions and dialogues. And don't forget to have a good pacing. Don't rush through important moments but also don't drag out the story unnecessarily.
I really like 'Avalon's Arthur in Fate Fanfic'. In this story, Arthur has a deeper connection with Avalon, his mythical resting place. It gives a fresh perspective on his powers and his relationships with other Fate characters. Then there's 'Arthur's Allies in Fate'. This fanfic focuses on Arthur forming new alliances and how those relationships shape his journey in the Fate world. 'The Pendragon Legacy in Fate' is also good. It explores how Arthur's legacy affects the present - day Fate universe and the characters within it.
A good 'Arthur Pendragon Merlin fanfic' often has a strong portrayal of their friendship. For example, it might show how they support each other through difficult times. Like when Arthur is facing a tough battle, Merlin is there with his magic to help, and vice versa.
One great 'Arthur Pendragon Merlin fanfic' is 'The Once and Future King' -esque story where Merlin's magic is a key factor in Arthur uniting the kingdoms. It shows their deep bond and how Merlin uses his powers to protect Arthur in a very creative way.
In some fanfictions, the heir of Arthur Pendragon could have a special connection to the magical creatures in the Harry Potter universe. Since Arthur was a great king, the heir might inherit his ability to communicate or form bonds with these creatures. This connection could be crucial in solving various mysteries in the wizarding world, like finding a hidden place where a powerful dark magic object is hidden. They could use the help of these creatures to outwit the villains who are also after the same object.
Maybe Arthur Pendragon gets transported to the Fate world and his presence disrupts the normal balance of power. The mages in the Fate universe might see him as a threat or an opportunity. He could end up being a wild card in the Grail War, not bound by the normal rules of Servant summoning. His noble phantasm, Excalibur, could be a game - changer in battles against other powerful Servants.
One possible plotline could be Arthur trying to escape the whore house and regain his honor. He might meet some unlikely allies among the people there who help him plan his escape.
Saber from Fate/Stay Night would be an obvious choice. Since she is also related to the Arthurian legend, there could be a lot of interesting interactions between them. They could compare their experiences as king, or even fight side by side against a common enemy.
One interesting Arthur Curry OC fanfiction could be about an OC who is a long - lost relative of Arthur Curry. This OC might have unique powers related to the sea that they discover while interacting with Arthur. Another could be a story where an OC is a scientist who is studying Arthur Curry and his abilities, and they end up on an unexpected adventure together.