A great alternative is exploring their family relationships. For example, how their family backgrounds influence their decisions and how they deal with the expectations from their families while still being true to their relationship with each other. It can add depth to their characters.
Another alternative theme could be their exploration of new places in their fictional world. They could discover ancient ruins or hidden magical places. This would not only show their sense of adventure but also how they rely on each other during these exciting escapades, which is a much more positive and engaging theme compared to inappropriate ones.
One appropriate theme could be their adventures together in the world of the Shadowhunters. For example, their battles against demons and how they support each other during difficult times.
Some appropriate themes could be their adventures together in the Shadowhunter world. For example, how they team up to fight demons and protect the Downworlders. Another theme could be their friendship and how it develops into a deeper relationship based on mutual respect and shared goals.
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.
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. 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 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.
One common theme is the adjustment to their new life together. They have to deal with the changes that come with being married and expecting a baby, like setting up a home. Another theme is the reactions of their friends and family in the fanfic world. Some fics might focus on how their family supports or maybe even opposes their situation at first.
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 is a very common theme. Since they are the main characters, their relationship, whether it's a budding romance or a long - standing love, is often at the center. Their journey of falling in love and staying in love is explored in different ways.
One common theme is adventure. Given the nature of the characters, many fanfictions might involve them going on exciting quests or facing dangerous enemies together.