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.
A more adventurous plot could be about Victoria going on a secret journey to a neighboring kingdom. She disguises herself to avoid being recognized and during this journey, she discovers new cultures and also uncovers a plot against her own kingdom that she has to thwart when she returns.
Another plot could involve her friendship with a commoner. She meets a young girl from the village near the palace and they form an unlikely bond, which causes a stir in the court as it goes against the norms of the time. This could show her more human side and her longing for normalcy outside of the royal duties.
A plot could involve a prophecy that mentions both Harry Potter and Seras Victoria. They have to find each other across their different worlds to fulfill the prophecy and save both the wizarding world and the world Seras comes from. Along the way, they face many challenges like different forms of magic that oppose them and the prejudices of the people in each world towards the other.
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.
A young artist who is commissioned to paint her portrait. He could be a bit of a rebel, with new ideas about art and the world, and through their interactions, Victoria gets a new perspective on things.
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 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.