One common theme could be emotional pain. Maybe Arthur has been betrayed by someone close to him, and the fanfiction explores his journey of dealing with that hurt. For example, if a friend he trusted turned out to be a traitor.
One common theme is physical injury and recovery. Since Arthur is often in dangerous situations in the game, fanfiction might explore how he deals with severe wounds, like a bad gunshot or a deep stab wound. Another theme is emotional pain from broken relationships. Maybe he has a falling - out with a fellow gang member or someone he cares about deeply. And the theme of self - blame also shows up a lot, where Arthur blames himself for things that go wrong in his life.
One common theme is loyalty. Arthur's protectiveness shows his loyalty to Merlin as his friend and servant. Another theme could be guilt. If Merlin is hurt because of Arthur in some way, Arthur feels guilty and that drives his protectiveness. For example, if Merlin takes an arrow meant for Arthur.
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.
One of the themes is leadership. Since Arthur is a king, many fanfictions explore how Gwen influences his leadership style and vice versa. They are often depicted as a power couple, making decisions together for the betterment of their people. Also, the theme of sacrifice is present in some fanfictions. Either Arthur or Gwen might sacrifice something for the other's well - being or for the good of the kingdom.
One common theme is the struggle between good and evil within their relationship. Since Morgana often turns to the dark side, it's about how Arthur tries to bring her back or how their relationship is affected. Another theme is love, either a forbidden love or a love that could have been if circumstances were different.
Another theme is change. Arthur's life changes drastically when his partner is pregnant. His daily routine, his relationships, and his own self - perception all shift. For example, he might become more responsible and caring.
One common theme is mentorship. Arthur often takes on a mentorship role for Harry, guiding him in the wizarding world. Another is family. Since Harry lacks a proper family, Arthur can represent a father - like figure in these stories.
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 common theme is loyalty tested. In many Merlin - Arthur hurt fanfictions, situations are created where Arthur's position as king or Merlin's role as his servant put their loyalty to each other on the line. Another theme could be sacrifice. For example, Merlin might have to sacrifice his magic or his safety to protect Arthur, or vice versa. Also, the theme of friendship in the face of danger is prevalent. They might be hurt physically or emotionally due to battles or political intrigue, but their friendship endures.
One common theme is isolation. Magnus might be isolated due to his unique powers or past traumas, which causes him pain. For example, in some fics, his immortality makes him feel alone.