The idea of the twins being outsiders or having a different background from the typical Hogwarts students is also common. They might come from a far - away magical land or have a different kind of magic that they bring to Hogwarts, which makes them stand out and affects the overall story in the fanfic.
Adventure is a big theme as well. Fanfictions often take the Patil twins on various adventures around Hogwarts or in the wizarding world at large. These adventures can range from solving mysteries within the castle to going on quests outside of it. It's all about showing the twins in exciting and often dangerous situations, and how they use their skills and wits to get through them.
A prevalent theme is the idea of redemption. Some fanfictions explore if the Carrow Twins could ever turn away from the dark side. There's also the theme of fear, as they are often the source of fear for the Hogwarts students. They are used to show the oppressive regime during Voldemort's time. And of course, there's the theme of their relationship with each other, which can be complex and often drives the plot in many fanfictions.
Friendship is a very common theme. The fanfictions often explore the deep and unique friendship between the Weasley twins. They are always there for each other through thick and thin in these stories.
One common theme is fixing past mistakes. Since they can time travel, the twins often try to correct things that went wrong in the original story, like saving a character or preventing a bad event from happening.
Common themes also include self - discovery. The Butterfly Twins might be on a journey to find out more about themselves. And sometimes, there are themes related to a particular power or ability that they possess, which they have to learn to control and use in the story.
Another theme is the idea of double the love or double the trouble. Sometimes the twins compete for the main character's love, which creates a lot of drama and tension in the story. And also, there can be a theme of identity, as the twins might be very alike but also have their own identities that the main character has to understand.
Power dynamics is also a common theme. Since purebloods are often seen as having more power in the wizarding world in the original series, fanfics might explore how Harry fits into this power structure. Maybe he challenges it or maybe he becomes part of it in a different way.
The exploration of power is also a major theme. Both Harry Potter and Loki have different forms of power. Harry has his magic skills and the power of love and friendship. Loki has his Asgardian powers and his wits. Fanfics often play with how these powers are used, compared, and sometimes combined in the face of various challenges within the story.
Power corruption is a common theme. Since Harry has so much power in the original story, in the fanfic, it often gets twisted and he might be lured by the dark side through the allure of more power. Another theme is the blurring of good and evil. The lines between what's right and wrong in magic become less clear.
Love and relationships can also be a common theme. A succubus may form unexpected relationships with the characters in the Harry Potter world. It could be a romantic relationship, a friendship or a mentorship. These relationships often challenge the traditional ideas of love and connection in the wizarding world. For instance, a succubus might fall in love with a wizard, and they have to overcome the differences in their natures and the potential prejudice from others.