A plot idea could be a time - travel fanfiction within the 'the dark artifices' universe. A character might go back in time to prevent a tragic event from happening, but in doing so, they unknowingly create new problems. Maybe they change the course of a character's life in a way that has unforeseen consequences for the balance between the shadowhunters and downworlders.
You could write a fanfiction where the main characters have to face a new, unknown threat that is not part of the original story. This threat could be something that combines the powers of different downworlder species in a malicious way. The characters would then have to figure out how to combat this new enemy while also dealing with their own personal issues and relationships within the group.
One idea could be exploring the backstories of the minor characters in more detail. For example, the life of a downworlder who has interacted with the main characters but whose story is not fully told in the original. Another could be a 'what if' scenario, like what if a certain character made a different choice during a crucial moment in the story. This could lead to a completely different chain of events and relationships.
Another idea might be a plot where the characters have to face a new, previously unknown threat that is related to the dark artifices but has a different origin. This could test their skills and relationships in new ways. Maybe it's a type of dark magic that was thought to be extinct but has been awakened.
There might be a 'dark artifices fanfiction' where a group of young shadowhunters in training discovers an ancient and powerful dark artifice that was long forgotten. They struggle with whether to use it for good or if it will corrupt them. This creates a lot of internal conflict among the characters and leads to an exciting plot full of twists and turns. It can also show how they grow as characters throughout the story.
One interesting concept could be how the characters' relationships are altered by time travel. For example, if a character goes back in time and meets their past self or a loved one at a different point in their life, it can create complex emotional and moral dilemmas.
Some fan fictions might take a darker turn and explore what would happen if a powerful dark force overtook the Institute. This could lead to a situation where the main characters have to make difficult choices between their loyalty to the Shadowhunter laws and their own moral compasses, making for a very engaging read.
One idea could be exploring Dark Seraphina's origin. Maybe she was once a normal angel but something tragic happened that turned her dark. Another could be a story where she teams up with an unlikely ally, like a human with special powers, to fight a common enemy. It could also be interesting to write about her trying to redeem herself.
One idea could be exploring how the prophecies are misinterpreted at first. Maybe the characters think it means one thing, but as the story unfolds, they realize it's something completely different.
Another plot idea could be a 'what if' scenario. For example, what if a certain event in Dark Harmony had a different outcome? This could lead to a completely different story line with new relationships and challenges for the characters.
Perhaps a story where a secret society meets only in the dark of night. The main character stumbles upon their meeting and gets drawn into a world of secrets, power struggles, and ancient rites.
A plot could involve a group of dark digimon forming an alliance to take over a particular area of the digital world. They start by targeting the weakest digimon settlements. The story could follow a young digimon trainer who tries to gather allies to fight back against this dark alliance. There could be many challenges along the way, like finding rare and powerful digimon to join the cause, and also dealing with the psychological warfare that the dark digimon use. For example, they might spread false rumors to cause distrust among the good digimon.
Perhaps a fanfiction could focus on the backstory of Harvey Dent before he became Two - Face. It could show his early days as a prosecutor and how his idealism gradually got corrupted, which would add more depth to his character in the Dark Knight universe.