First, you should study the characters of Arthur and Uther. Know their traits, like Arthur's courage and Uther's strong leadership. Then, think of a unique plot. Maybe it could be about a time - traveling Arthur meeting a young Uther. Start with an interesting opening scene to hook the readers.
One great Arthur Uther fanfic could be 'The Bond of Father and Son'. It delves deep into their relationship, showing Uther's strict but loving side towards Arthur. Another one might be 'Arthur's Training with Uther' which focuses on the lessons Arthur learned from his father.
The unique aspect is the complex triangle of relationships. Fem Merlin adds a different flavor to the traditional Arthurian tales. Her relationship with Arthur can be both romantic and a strong friendship. With Uther, it's often a relationship of power dynamics and unexpected respect that grows over time.
There's also 'Three Paths in Camelot'. In this fanfiction, fem Merlin has to navigate her feelings for both Arthur and Uther. The author does an excellent job of showing the different dynamics. Arthur is attracted to her strength and kindness, while Uther starts to see her as an important asset to Camelot. It's a really interesting read.
One common theme is redemption. Uther has been so against magic, but in these fanfics, he often has to face his prejudices when it comes to Merlin. For example, he might realize that not all magic is evil through Merlin's actions.
It would likely become very strained. Arthur has been brought up to uphold his father's anti - magic stance. So, when Uther discovers Merlin's magic, Arthur might initially feel betrayed and distance himself from Merlin.
Uther might initially be shocked. He has always been so against magic, so he could be furious at first. He might feel betrayed by Merlin, whom he has known for a while.
One possible plot could be that Harry discovers his true heritage as the son of Uther Pendragon. He then has to navigate between the wizarding world he knows and the newfound Arthurian legend - related powers and responsibilities. He might face challenges from both sides, like dark wizards in the Harry Potter world who fear his new power, and enemies from the Arthurian realm who see him as a threat or an opportunity.
One popular 'Uther Pendragon x Merlin' fanfic is 'The King's Mage'. It delves into an alternate universe where Uther discovers Merlin's magic earlier and their relationship takes a very different turn. It has a great plot that shows the growth of their bond in a complex political and magical setting.
It would be very complex. Initially, Uther would be in shock. He has been hunting magic - users, and now his son is one. But he might also feel a sense of protectiveness. Merlin, on the other hand, would be confused and angry at being lied to about his identity. Eventually, they might start to understand each other more. Uther could see the good in Merlin's magic and Merlin could see the reasons behind Uther's actions, even if he doesn't agree with them all.