Some fanfictions might make Draco Malfoy the dark king. He has the background of a pure - blood wizard family with some dark tendencies in the original story. If he were to fully embrace the dark side and rise to power, it could lead to very interesting story developments.
A less obvious candidate could be a corrupted Dumbledore. Imagine if he was swayed by the allure of absolute power and became the dark king. It would be a huge twist as he is seen as a symbol of good in the original books.
It could be about Harry Potter having some sort of connection or role as the 'king' of dark creatures in a fan - created story. Maybe he discovers a hidden power within himself that gives him control over these usually feared beings.
Most likely Harry Potter himself would be a main character since he is in the title as the 'king of dark creatures'.
In some 'harry potter dark king fanfiction', there could be a plotline where the dark king has a hidden agenda related to ancient magic. He might be searching for a powerful, long - lost spell or artifact that could give him ultimate control over the wizarding world, and Harry Potter and his friends have to stop him.
In this fanfiction, the Dark Prince might find allies among those who have been wronged by the Ministry of Magic. If there are wizards who have been unjustly punished or whose families have been persecuted, they could be swayed to join the Dark Prince. There could also be some international dark wizards who see an opportunity to expand their influence in the British wizarding world through an alliance with the Dark Prince. Another possibility is that there are some dark entities from other dimensions or realms that the Dark Prince manages to summon and convince to be his allies.
There could be some disillusioned wizards who have lost faith in the current state of the wizarding world. They might see the Dark Prince as a way to change things, even if his methods are dark. These wizards could be those who have been marginalized or have suffered losses during the war. They believe that the Dark Prince has a vision for a different kind of wizarding society, not realizing the full extent of his dark intentions.
Bellatrix Lestrange could be a potential focus as a dark arts master in fanfiction. She already has a deep knowledge of the dark arts in the original series. Fanfiction could explore her even more, perhaps showing her training others in the dark arts in a more in - depth way.
For the Atlantis side, there could be Atlantean royalty, like a princess or a group of elders. There might also be Atlantean mages or warriors. And don't forget about the mer - people. They could play a role, either as allies or antagonists. Maybe there's a mermaid who falls in love with Harry and helps him understand the ways of Atlantis.
One plotline could be that the 'Spider King' has some sort of ancient grudge against the wizarding world in 'Harry Potter'. His minions start to infiltrate Hogwarts, and the students have to use their magic to fight back. Another could be that a prophecy in the 'Harry Potter' world mentions the 'Spider King', and Harry is tasked with finding out more about this new threat.
One potential consequence could be a change in his relationships. His friends might be worried or even turn against him. For example, Hermione, who is always concerned about following the rules and doing what's right, would likely be very troubled. Another consequence could be a shift in his own moral compass. The dark arts are often associated with negative and unethical actions, so he could start to make more morally ambiguous decisions.
Obviously, Harry Potter himself as the Ice King. Then there would be Draco Malfoy. He could be either a rival or an ally to Harry in this new role. Hermione would also be there, trying to understand the magic behind Harry's transformation and helping him control his powers. And of course, Snape, who might have some knowledge about the Slytherin magic related to the Ice King.