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.
Some interesting Uther x Merlin fanfictions include 'Uther's Second Chance'. In this story, Uther is given an opportunity to redo some of his actions regarding magic after seeing the future Merlin shows him. 'The Unlikely Friendship' is also popular, as it tells the story of how Uther and Merlin form a friendship despite all odds. And 'Merlin's True Purpose in Uther's Eyes' which explores how Uther starts to see Merlin as more than just a servant as the story progresses.
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 great Merlin Uther fanfiction is 'The King's Regret'. It delves into the complex relationship between Merlin and Uther. It shows how Uther might have reacted differently to Merlin's magic if he had known the truth earlier. Another is 'Uther's Hidden Affection', which explores a more emotional side of Uther towards Merlin, a side that was perhaps masked by his hatred for magic in the original series.
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.
Maybe in the fanfiction, Uther discovers the creativity and the different perspectives on his world and characters, and he sees value in it. He might be a more open - minded version of himself in the fan - created stories.
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.
There probably is. The Merlin fandom is quite large and diverse. Some fans might be interested in exploring the consequences and emotional turmoil that would result from such a dark event as Uther killing Merlin. You can look for it on popular fanfiction websites like Archive of Our Own or FanFiction.net.
One great Merlin and Uther fanfic could be one that explores their complex relationship before Uther's death. It might focus on how Merlin, despite Uther's harsh actions at times, still respected the king as the leader of Camelot. Another could be a fanfic where Uther discovers Merlin's magic early on and has to deal with his own prejudices in a different way. There are also fanfics that place them in alternate universes, like a modern - day setting where they have to adapt to new rules and social norms while still maintaining their core characteristics.