One popular theme is the sister's relationship with her archangel brothers. It could be about her trying to fit into their world or dealing with their overprotectiveness. Another theme is her own powers and how she discovers and controls them in the context of the Supernatural universe.
In Supernatural Archangel Sister Fanfiction, a very popular theme is the sister's origin story. Writers often explore how she came to be an archangel sister. Some stories focus on her love life as well. She might fall in love with a human, a demon, or another supernatural being. This creates a lot of interesting plot twists as she has to balance her feelings with her family obligations and her place in the Supernatural hierarchy. Another theme that is quite common is her role in the apocalypse or in preventing some great catastrophe in the Supernatural universe.
A common theme is the sister getting involved in the battles between the archangels. Maybe she has to choose a side or tries to stop the fighting. There are also stories where the sister has a special mission or prophecy related to her existence as an archangel sister. These often involve her going on adventures and facing various challenges in the Supernatural world. The theme of family loyalty and betrayal also pops up a lot in these fanfictions, as the relationships between the archangels are complex and full of drama.
A lot of fanfictions focus on the idea of Castiel being different from other angels because of his connection to the Winchesters. There are themes of forbidden love, like a romantic relationship between Castiel and an archangel which goes against the angelic rules. Also, the exploration of Castiel's true purpose and how it relates to the archangels' plans is a big theme.
Redemption is also a common theme. Given his complex backstory in the show, fanfictions often delve into Gabriel's journey towards redemption. This could involve him making amends for past actions or finding a way to atone for his mistakes. Writers might explore his relationships with other characters like Castiel or the Winchesters in the context of this redemption arc. It can be really interesting to see how different authors interpret his path to redemption.
One popular theme is the forbidden love aspect. Since archangels are often depicted as powerful and otherworldly beings, a relationship with a human soulmate can be seen as forbidden. Another theme is the idea of the soulmate bond being able to overcome great obstacles, like the battles and power struggles in the Supernatural universe.
One common theme is the origin story of the 5th Archangel. Writers often explore how this archangel came to be in the Supernatural universe. Another theme is its relationship with the other well - known archangels like Michael and Lucifer.
One common theme is power and its consequences. Female archangels often have great power, and the fanfictions usually explore how they handle it, whether they use it for good or are tempted by the dark side of that power.
Another theme is the exploration of different realms. As Gabriel has the ability to travel between realms, fanfictions often take the soulmate on adventures through different planes of existence. This allows for some really creative and exciting storylines, with the couple facing various challenges in different supernatural settings.
Another theme is their relationships with humans. For example, an archangel might form an unlikely bond with a human character, and the fanfic delves into how that relationship develops and affects both parties. It can be a romantic relationship or a more platonic mentorship - like bond.
One common theme is the idea of power and its control. In Percy Jackson, the demigods have their own powers, in Supernatural the angels and hunters have powers, and Archangels are extremely powerful. Fanfics often explore how these different power sources interact. Another theme is the fight between good and evil. All three have clear concepts of good and bad forces, and fanfictions might bring them together in new battles. For example, the demigods and the Winchesters might join forces against a powerful demon or an ancient evil from Greek mythology.
One popular plot twist could be Castiel secretly being an archangel all along but having his memories wiped. It adds a whole new layer of mystery to his character. Another could be that he is an archangel in a parallel universe and gets switched with the Castiel in the main universe. This can lead to some really interesting character interactions.
One popular theme is Castiel's relationship with other characters, such as his loyalty to Dean and Sam. Another is his struggle with his angelic nature and his growing understanding of humanity.