A frequently seen theme is friendship. In fanfictions like 'Merlin and the Fellowship', Merlin forms new friendships with characters from other stories. Adaptation is also a theme. In crossovers, Merlin has to adapt to new rules and cultures, such as in 'Merlin in Asgard' where he has to figure out the ways of the Norse gods. Additionally, the theme of identity is common. As Merlin interacts with new characters, he may question his own identity and purpose, as seen in 'Merlin and the X - Men' where his magic makes him an outlier among the mutants.
Common themes in Merlin crossovers fanfiction include exploration. Merlin gets to explore new places and concepts, like in 'Merlin in the Land of Oz'. Another theme is the search for knowledge. When he crosses over into a world like that of the Time Lords in 'Merlin and Doctor Who', he is eager to learn about their advanced technology and knowledge. And of course, the theme of heroism. Merlin often has to prove himself as a hero in these new crossovers, whether it's against an alien threat in 'Merlin in the Alien Universe' or a powerful dark wizard in 'Merlin and the Dark Lord'.
One common theme is the struggle of the reincarnated character to adapt to a new and often strange world. They have to learn new rules, cultures, and magic systems if there are any. Another theme is the use of knowledge from their previous life. For example, if they were a scientist in their past life, they might use scientific knowledge in a fantasy world. Also, there's often a theme of self - discovery as they figure out who they are in this new reincarnated form and how they fit into the crossover world.
A prevalent theme in sonic crossovers fanfiction is the fight against a common enemy. Whether it's an evil force from Sonic's world or a new threat created by the crossover, characters from different franchises join forces. Also, the theme of discovery is common. Sonic and the other characters discover new places, cultures, and ways of life in the crossover stories.
One common theme is the clash of different magical systems. Merlin has his druidic magic and Loki has his Asgardian magic, so a lot of fanfics explore how these two types of magic interact. For example, in some stories, they might try to combine their powers to defeat a common enemy.
In sub Merlin fanfiction, a major theme is secrecy. Given Merlin's sub position, he must keep his magic a secret, and this secrecy drives a lot of the plot. Another theme is growth. He grows as a person and as a magic - user while being in a sub role. It's about how he overcomes the limitations of his position. Additionally, the theme of sacrifice is common. Merlin is often in situations where, because of his sub role, he has to sacrifice something for the greater good, whether it's his own safety or his relationships.
The theme of sacrifice is also quite prevalent. In many fanfictions, Merlin's father has made sacrifices for Merlin's future, which Merlin discovers as the story progresses. It gives a deeper understanding of their relationship.
In Merlin vampire fanfiction, the theme of acceptance is quite common. Whether it's Merlin accepting the existence of vampires or the vampires accepting Merlin's power. Another is the theme of transformation. Merlin might transform in some way due to his encounters with vampires, or the vampires themselves may transform, either physically or in their attitudes. And the theme of forbidden knowledge often pops up, as the vampires may possess knowledge that is both dangerous and alluring to Merlin.
Another theme is friendship. The neckerchief can be a focal point for the relationships Merlin has with Arthur, Gwen, and the other characters. For example, it might be a gift from a friend that holds special meaning.
Another theme is self - discovery. When Merlin crossdresses, he often discovers new aspects of himself or how others perceive him differently. For instance, he might learn that he can be more confident in a different guise. Also, it can be about breaking gender norms. In these fanfictions, Merlin challenges the traditional gender roles of the Camelot society, which adds an interesting layer to the story.
One common theme is the shock and disbelief among the characters. Given Merlin is male in the original series, his pregnancy is quite unexpected, so characters often struggle to come to terms with it.
Redemption is also a common theme. Since Morgana often takes a darker path in the original, many fanfictions explore the possibility of her redemption, with Merlin being a key factor in that journey. Love, in various forms, is another theme. It could be a platonic love born out of mutual understanding or a more romantic love that defies the odds.