One idea could be exploring the origin of the 'queen of the black puddle'. Maybe she was once an ordinary being who was transformed by a dark magic spell. Another plot could involve her forming an unlikely alliance with a group of adventurers who initially feared her but later realized she was key to saving their world from an even greater evil. And a third idea might be her quest to find a way to purify the black puddle she rules over, as it's slowly corrupting the surrounding lands.
An ancient and malevolent spirit that was once trapped in the black puddle but has now been freed could be a major antagonist. This spirit wants to take over the queen's body and use her connection to the puddle to spread chaos across all the realms. It constantly whispers dark thoughts into the queen's mind, trying to make her lose control and become a puppet for its own evil plans.
Another plot idea could be a time - travel scenario within the 'The White Queen' universe. A character travels back in time and tries to change the events that led to the current state of affairs, which then creates a ripple effect of changes throughout the story.
Another plot could be that the vampire queen discovers a plot to overthrow her. She has to use her wits and powers to figure out who is behind it and stop them before it's too late. This could involve a lot of political intrigue within the vampire world.
In this 'Harry and the Queen fanfiction', there could be a scenario where Harry, being a commoner with a big heart, teaches the Queen about the modern world outside the palace walls. The Queen, in turn, imparts her wisdom and knowledge of the long - standing traditions of the monarchy. This exchange of ideas could lead to them making positive changes in the kingdom, like implementing new policies that benefit both the royals and the common people.
One idea could be Mal having to face a new, powerful villain from a forgotten part of the isles. This villain could be threatening to take over all the territories Mal has united. Another could be Mal going on a journey to discover more about her family's past and unearthing secrets that change her perception of herself and her role as queen.
One idea could be that Bella discovers she has a special power that the Volturi Queen is envious of. So, the Queen tries to manipulate Bella into using it for her own gain. Another could be Bella forming an unexpected alliance with the Volturi Queen to fight a common enemy that threatens both the Cullens and the Volturi.
Perhaps Mal starts a school on the Isle, similar to Auradon Prep but with a more villain - friendly curriculum. This could lead to all kinds of interesting interactions between the students and Mal as she tries to shape the future of the Isle.
One idea could be exploring her early days as queen and her relationships with her advisors. Maybe a story where she has to prove herself to the older, more experienced men in her court.
One plot idea could be that the Demon Queen is initially an enemy but Naruto, with his talk - no - jutsu, tries to understand her motives. Maybe she has a tragic past that led her to be a 'demon queen' and Naruto wants to help her change. Another could be that they are forced to team up against a greater evil that threatens both the ninja world and the demon realm. For example, an ancient dark force that wants to enslave both humans and demons.
Another plot could involve Naruto visiting Thea Queen's world. He might be confused by the advanced technology at first but quickly adapts. Naruto could use his shadow clone jutsu to help Thea Queen in a fight against her enemies in Star City. They could also learn from each other's sense of justice and determination.