Well, a plot could involve the female knight being sent on a diplomatic mission to a neighboring kingdom. Along the way, she faces various challenges and meets interesting characters. Maybe she has to negotiate with a difficult ruler while also dealing with her own feelings of being an outsider in a male - dominated world of knights. Another plot could be that she discovers a conspiracy within Camelot that threatens Arthur, and she has to work secretly to expose it.
A really interesting plot could be that the female knight is from a far - off land and brings with her new ideas and techniques. She challenges the traditional ways of the knights of Camelot. For example, she might introduce a new form of swordsmanship or a different approach to chivalry. There could also be a love story involved, where she falls in love with one of Arthur's trusted knights, but their relationship is complicated by their different backgrounds and the expectations of the court.
One plot idea could be Issei discovers a hidden relic related to King Arthur. This relic gives him some of Arthur's powers, leading to a power - up journey where he has to learn to control these new abilities while also facing enemies who want the relic for themselves. Another idea is that Issei somehow travels back in time to the era of King Arthur and has to interact with the legend himself, maybe even joining Arthur's knights for a while.
One idea could be that Naruto has Arthur's leadership skills and uses them to unite the ninja clans in a new way. He might also inherit Arthur's sense of justice and chivalry, which would make him approach battles and conflicts differently.
One idea could be that Harry Potter discovers an ancient magic artifact that transports him to the time of King Arthur. There, he uses his magic skills to help Arthur in a battle against a powerful dark sorcerer. Maybe he teaches some of the knights a few new spells.
One idea could be that Arthur discovers a new hidden tribe of invisibles. They have a unique power that can help save the Invisibles' world from a new threat. Another could be Arthur goes on a quest to find a magical object that was lost long ago in the Invisibles' realm, which is said to grant the finder a special wish.
One plot idea could be a female Naruto character being transported to the Vampire Knight world. She might use her ninja skills to survive in the new and dangerous environment filled with vampires. Maybe she tries to find a way back home while also getting involved in the power struggles between the different vampire factions.
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 that Merlin has to hide his magic even on his wedding day to Arthur. Maybe there are some old enemies who try to disrupt the wedding, and Merlin uses his magic subtly to protect everyone without being detected. Another plot could involve Arthur trying to incorporate some of Merlin's commoner traditions into the grand royal wedding, causing some comical and heartwarming moments among the nobility.
One idea could be that Merlin, Arthur, and the Smurfs team up to save their respective kingdoms from a common dark magic threat. The Smurfs' magic combined with Merlin's could create a powerful force against the enemy. Another plot could involve Arthur getting lost in the Smurf village and learning their simple and happy way of life, which then influences his rule in Camelot.
The baby could be a key to uniting two warring factions in the Arthurian world. Arthur and Gwen would then have to navigate the political and social implications of this. They could have to protect the baby from those who would use it for their own gain. Or perhaps the baby has a unique connection to the magical elements of the land, like being able to make plants grow instantly or control the weather. This would attract the attention of both good and bad forces, and Arthur and Gwen would have to be vigilant.
One idea could be a time - travel plot where Hermione somehow gets sent back in time and meets a younger Arthur Weasley. They could team up to solve a mystery that is related to the Weasley family's past and the wizarding world at large. This would allow for a lot of exploration of the wizarding world's history and the early days of the Weasley family.