A great plot idea is to have a character who is fated by the dark prophecies to be the villain, but they fight against that fate. They struggle with their own nature and the expectations set by the prophecies. This internal conflict can drive the story forward and make the readers root for the character to overcome their pre - determined path.
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.
In a fantasy world, there's a prophecy that states a chosen one will bring balance to the four elements that have been in chaos for centuries. The protagonist, a young and inexperienced person, is believed to be the chosen one. However, they don't believe it at first. As they start to experience strange powers related to the elements, they are thrust into a world of politics and magic. Different factions either want to use them or stop them, believing different interpretations of the prophecy. They must figure out their true purpose and how to actually bring balance to the elements while avoiding being manipulated.
The hero or protagonist is also common. This is the character who is either directly affected by the prophecies or is trying to stop their dark outcomes. They could be a brave warrior, a cunning mage, or just an ordinary person thrust into extraordinary circumstances. There are also usually antagonists. These could be the ones trying to make the dark prophecies come true, perhaps for their own gain or because they believe in the 'rightness' of the prophecies' dark outcomes. For example, a power - hungry sorcerer or a fanatical cult leader.
Perhaps they are living in a parallel universe where everything is dark and gloomy. Dark Naruto and Dark Kushina could be trying to find a way to break through to the normal universe. They might encounter strange versions of their friends and foes, and have to battle their own inner demons along the way. For example, Dark Naruto might struggle with the darker aspects of the Nine - Tails' power that he has fully embraced in this universe.
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 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 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.
One idea could be Ahsoka being corrupted by the dark side due to a powerful Sith artifact she discovers. She starts to use her skills for her own gain, causing chaos in the galaxy. Another could be her being manipulated by a hidden Sith Lord who convinces her that the Jedi way is wrong. Maybe she forms her own dark order, recruiting those who feel betrayed by the Jedi or the Republic.