These fanfictions are popular because they allow for a lot of character exploration. Uther is a complex character, and when he adopts Merlin, we can see different sides of him. For example, we might see a more nurturing Uther, which is a contrast to his usual strict self. Also, Merlin's character can develop in new ways, like how he might use his magic more openly or subtly within the context of being Uther's adopted son. It gives the writers a chance to play with the existing characters and create new and exciting storylines.
A popular one is 'Merlin: The Adopted Son'. This fanfiction focuses on how Merlin, as Uther's adopted son, has to navigate the politics of Camelot while hiding his magic. It also explores the relationship between Merlin and Arthur from a new perspective, as brothers in a way, which makes for a very engaging 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.
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.
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.
It could mean that in the context of the Merlin fandom, Uther's character is being depicted in a way in fanfiction that is acceptable or even favored by some fans. Maybe the fanfiction shows a different side of Uther that makes his actions more understandable or redeemable, and thus it is seen as approved within the fan community.
Power dynamics is a major theme. As Merlin is Uther's son, it affects his standing in Camelot, both in terms of political power and magical power. Also, redemption is a theme sometimes. Uther was not always kind to magic - users, and this relationship can lead to a path of redemption for him in some fanfictions.
One popular 'Uther Merlin father' fanfiction is 'The King's Secret Son'. It delves into the idea of Uther secretly being Merlin's father and how that changes the dynamic in Camelot. It has great character development and interesting plot twists.
One common theme is power dynamics. Given Uther's position as king and Merlin's as his servant, there's often exploration of how power affects their relationship. Another theme is secrecy, as Merlin has to hide his magic from Uther.
The relationship between Merlin and Uther is full of contradictions, which makes fanfiction about them really interesting. Uther hates magic, but Merlin has magic. Fanfictions can explore how they could have interacted in different scenarios, like if Uther found out about Merlin's magic earlier.