A more complex plot could be that the Invisibles' world starts to merge with Arthur's human world. This causes chaos as the different rules and natures of the two worlds collide. Arthur has to find a way to separate the worlds again. He teams up with his Invisibles friends and some human friends who have become aware of the situation. They embark on a journey to find the source of the merge and reverse it. Along the way, they face challenges like dealing with creatures that are half - human and half - Invisible, and trying to keep the humans from panicking.
One idea could be that Arthur crosses over into a world where the Invisibles are facing a new and powerful enemy. He uses his human creativity and skills to help them find a solution. For example, he might introduce new technologies or ways of thinking that the Invisibles haven't considered before.
Another plot could involve a character from another story crossing over into the 'Arthur and the Invisibles' world. Let's say a character from a fairy - tale land comes. This new character could have a special power that is both useful and confusing in the Invisibles' world. Arthur has to figure out how to work with this new character and their power to save the day. There could be misunderstandings and comical situations at first, but they eventually learn to cooperate.
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.
A character like Alice from 'Alice in Wonderland' could be really interesting. She's used to strange and magical worlds, so she could interact with the Invisibles in a unique way. Maybe she could help Arthur navigate some of the more confusing aspects of the Invisibles' world with her own experiences in Wonderland.
One idea could be an Arthur crossover with the world of Alice in Wonderland. Arthur could find himself in Wonderland, meeting the strange characters and getting into all sorts of wacky adventures. Another could be a crossover with a superhero universe, where Arthur gains superpowers and has to save his world from a new threat. A third idea might be an Arthur crossover with a historical setting, like the Middle Ages, where he has to adapt to the different time period and its challenges.
Maybe Arthur Pendragon gets transported to the Fate world and his presence disrupts the normal balance of power. The mages in the Fate universe might see him as a threat or an opportunity. He could end up being a wild card in the Grail War, not bound by the normal rules of Servant summoning. His noble phantasm, Excalibur, could be a game - changer in battles against other powerful Servants.
Arthur is the main character. He is a young boy who embarks on an adventure in the world of the invisibles. There is also Princess Selenia. She is a brave and strong - willed character in the invisible world.
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 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 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.