Perhaps a plot where the Dark King discovers a hidden power within himself. This power could be the key to saving his kingdom from a long - predicted doom. But to fully master it, he has to go through a series of trials, both physical and mental, that test his limits as a leader and as an individual.
Another plot might involve the Dark King's love interest. He could be in love with a commoner, and this relationship causes a stir in the court as it goes against the traditional norms. There could be many obstacles in their way, like the disapproval of the nobles and the interference of the king's enemies.
One interesting plot could be the Dark King's struggle against an ancient evil that threatens his realm. Maybe he has to gather allies from different corners of his kingdom, some of whom are reluctant at first but later come to see the importance of the fight.
Well, a plot could be that King Sombra is resurrected by some dark magic, but this time he has a different goal. Instead of just ruling Equestria through fear, he wants to find a way to break the cycle of hatred. He starts to interact with the ponies in a strange way, and they are both scared and intrigued. There could be a pony who tries to understand him and change his view of the world.
Perhaps a plot where Orion has to face his inner fears represented by the dark. It could involve him having to make difficult choices to overcome the darkness that surrounds him. He might find allies along the way who teach him how to control the power of the dark rather than be consumed by it.
One interesting plot could be the dark prince's struggle with his inner darkness. Maybe he has to make a choice between following his dark instincts or a path of redemption. For example, he meets a character who shows him kindness and makes him question his ways.
Well, a plot might be that Dark Naruto in the fanfiction is on a journey to change the ninja world with his harem by his side. They could be facing off against the established shinobi villages' old ways. For example, they might try to create a new system where power is more equally distributed among all ninjas, not just the elite families. And the harem members could each have special skills that contribute to this goal.
One interesting plot could be the exploration of a new, hidden power that the main character in the fanfiction discovers. This power might change the dynamics of the story and lead to new adventures.
One interesting plot could be that Dark Carlisle has some hidden powers that Bella discovers. This discovery could lead to a series of adventures where they have to face off against some new and powerful enemies in the vampire world.
One possible plot could be that Dark Naruto, with his newfound power and darker side, forms an unexpected alliance with Ino. Maybe they team up to take on a common enemy that the regular shinobi world is too afraid to face. In this story, Ino could use her mind - reading skills to help Dark Naruto control his rage and better understand his power.
One possible plot could be Harry being influenced by dark magic artifacts. For example, he might find an ancient cursed object that gradually corrupts his mind and makes him turn dark. Another could be that he is betrayed by those he trusts, which pushes him over the edge into darkness.
Well, in some 'Hermione and Harry Dark Fanfiction', there might be a plot where they enter a dark, alternate magical realm. In this realm, they have to rely on their friendship and skills in new ways. They could encounter dark versions of their friends and have to fight against them, which would really test their loyalty to each other.
In some naruto dark guild fanfiction, there might be a plot where the dark guild is secretly working with rogue ninjas to create chaos in the ninja world. They could be trying to disrupt the balance of power between the villages. For example, they might start false rumors about one village attacking another to incite war. This would force Naruto and his friends to not only deal with the physical threats but also the political unrest caused by the dark guild's actions.