One common theme is the clash of different forms of power. Merlin has his old - world magic and wisdom, while Umbridge has her political power within Hogwarts. Another is the idea of resistance. Merlin would likely oppose Umbridge's unjust rules.
Yes, there are. You can find them on various fanfiction platforms. Some might explore Merlin's magic in the context of Hogwarts where Umbridge is trying to enforce her strict rules. It could be a really interesting clash of two different magical universes' power dynamics.
Their interaction would be intense. Merlin, being from a different era and having a different view of magic, would likely be appalled by Voldemort's use of dark magic. Voldemort, on the other hand, would probably see Merlin as a threat to his power. Merlin might try to reason with Voldemort at first, but when he realizes that Voldemort is beyond redemption, he would use his magic to stop him.
Merlin is from a time when magic was perhaps more primal and less restricted. He has an intuitive understanding of magic that Voldemort, who is more about power - hungry and dark magic, might not fully comprehend. Merlin has been known to perform feats like creating powerful illusions and controlling the elements. Voldemort's main strength lies in the Unforgivable Curses and his ability to create Horcruxes. But in a direct magical duel, Merlin could use his magic to disrupt Voldemort's attacks. For example, he could use his knowledge of nature magic to counter Voldemort's dark spells. Also, Merlin's ability to blend into his surroundings and his quick thinking would make it difficult for Voldemort to land a decisive blow.
One great female Merlin fanfic could be one where she uses her magic in unique ways to save Camelot. For example, in a story she might use her powers to heal the knights secretly when they are injured in battle. This would add an interesting twist as she has to hide her actions from Uther.
If Merlin died in the fanfiction, it could trigger a series of tragic events. The balance of power could tip, and the villains might seize the opportunity to attack. It could also bring out hidden strengths in the remaining characters as they try to cope with the loss.
In a more humorous take on the 'Merlin tied to a bed' fanfiction, it could be that Merlin has fallen ill and the overly - protective Gaius has tied him to the bed to make sure he rests. Merlin, being the active person he is, complains constantly. Arthur comes to visit and teases Merlin about finally being still for once. Meanwhile, Merlin tries to convince Arthur to let him loose, promising that he'll be fine. Eventually, Gaius relents and unties Merlin, who then immediately starts bustling around the room.
One possible reason could be a magical curse. In many Merlin fanfictions, magic is often used as a plot device. A dark sorcerer might cast a spell on Merlin to make him forget certain things, perhaps to prevent him from using his powerful magic to oppose them. Another reason could be a self - imposed forgetting due to trauma. Merlin has witnessed and endured a great deal of pain and suffering. To protect his own mental state, his mind might subconsciously block out certain memories.