Power is a common theme. All three characters possess certain powers in the Shadowhunter world. Fanfics often explore how they use or misuse their powers, and how power affects their relationships. For example, Sebastian's quest for power might put him at odds with Clary and Jace. Also, the theme of family is present. Clary's connection to both Jace and Sebastian in different ways ties into the idea of family, whether it's a found family or a biological one.
The theme of identity is quite common. Clary is still figuring out who she is as a Shadowhunter, Jace has his own identity issues, and Sebastian has a rather complex identity. Fanfics play around with these identity crises. Another recurring theme is sacrifice. Characters might have to sacrifice something, like their own desires or relationships, for the greater good. This is often explored in fanfics involving these three characters.
One common theme is their forbidden love. Since they are Shadowhunters with certain rules and taboos in their world, their love often goes against some norms, which makes for a very intense and passionate story.
Love and attraction are common themes. Since it's about Clary seducing Jace, there's a lot of focus on their growing feelings for each other. Another theme could be the power dynamics, as Clary tries to take the initiative in the relationship.
One popular Clary, Jace, and Sebastian fanfic is 'The Shadow World Chronicles'. It delves deep into the complex relationships between the three characters. The author does a great job of exploring their individual personalities and how they interact in different situations. Another one could be 'City of Shadows and Secrets' which has some really interesting plot twists involving these characters.
Adventure is another theme. Given that they are Shadowhunters, many fanfictions continue their adventures, facing new demons and solving mysteries. This not only tests their relationship but also shows how they grow as individuals within the relationship. For example, in some fanfictions, they might have to go on a quest to find a lost relic, and during this journey, their bond either strengthens or is put to the test.
Love is a very common theme. Since they are a couple in the original series, fanfiction often explores different aspects of their love, like how they overcome obstacles to be together. Another theme is adventure. Fans like to put Jace and Clary in new adventures that are related to their world of shadowhunters.
One common theme is the struggle between good and evil. Since Sebastian is often seen as a villain and Clary as a hero, their relationship in fanfics often explores how Clary might be able to redeem Sebastian or how she has to fight against his evil intentions.
One common theme is redemption. Jace usually has to atone for his actions that hurt Clary. For example, he might go on a quest to find a way to reverse the damage he's done.
Love is a very common theme. Their intense, passionate love for each other is often explored in great detail. Another theme is sacrifice. They are often put in situations where they have to sacrifice something for the other.
One common theme is the exploration of their complex relationship. Given their rather dark and twisted connection in the original story, fanfictions often delve deeper into how they interact with each other, whether it's Sebastian's attempts to manipulate Clary or Clary's struggle against his influence.
The theme of sacrifice is also quite common. They might have to sacrifice their own desires, like their freedom or their previous life goals, for the sake of the baby. Also, the theme of identity. With the pregnancy, they both have to re - evaluate who they are. Clary is no longer just a young shadowhunter, but a soon - to - be mother. Sebastian has to figure out if he can be a father and what kind of father he wants to be, considering his dark past.