A possible plot for a Merlin as a Borrower fanfiction could be that Merlin, in his borrower form, accidentally gets transported to a different realm. In this new realm, the rules for borrowers are very different and he has to learn quickly to survive. He meets other borrowers there who have unique abilities and he has to figure out how to get back to Camelot. Another idea is that Merlin is trying to help the borrowers in Camelot improve their living conditions. He uses his magic to build them better shelters and find new sources of food. However, his actions draw the attention of Morgana who is suspicious of the strange happenings in the castle. She starts to investigate and Merlin has to be extra careful not to get caught.
One plot idea could be Merlin, as a borrower, is discovered by Arthur. At first, Arthur is shocked but then becomes intrigued. He decides to protect Merlin from the other humans in the castle. Another idea is that Merlin, in his tiny form, uses his magic in new and creative ways to help the borrowers' community. For example, he could create miniature tools or defenses against predators. A third idea might be that Merlin has to go on a quest to find a magical item that can restore his normal size, all while facing the challenges of being so small in a big world.
One plot idea could be Merlin and Nimue teaming up to save a magical forest that is being threatened by dark forces. They could use their combined magic to fend off the evil entities. Another idea is a time - travel plot where they are sent to the future and have to adapt to the new world while also finding a way back. And perhaps a plot where they are wrongly accused of a crime in Camelot and have to prove their innocence together.
One idea could be that Merlin, as a wizard, is hunted by vampires because his magic is seen as a threat to their existence. But then he discovers that some vampires are not as evil as he thought and they form an uneasy alliance to fight a common enemy, like a dark sorcerer.
One idea could be Merlin having to deal with the political intrigue of being a king. He might face challenges from nobles who don't trust his magic. Another could be Merlin using his magic in unique ways to improve the kingdom, like creating new irrigation systems for farmers. Or perhaps he has to form alliances with other kingdoms while hiding his true identity as a powerful sorcerer.
A plot could involve Merlin getting cursed and the knights having to find a way to break it without Merlin's magic to guide them. They might have to rely on old legends and their own wits to save him. This could lead to some great character development for the knights as they face challenges they usually rely on Merlin to solve.
One idea could be exploring a different magical realm within the 'the merlin conspiracy' universe. Maybe there's a hidden land where the magic is more primal and ancient. Another could be a story about a young wizard who discovers they have a unique connection to Merlin himself and must use that to stop a new dark threat.
One idea could be that Peter Pan and Merlin meet in a magical realm between Neverland and Camelot. They team up to fight a common enemy, like an ancient evil sorcerer who is trying to steal the magic from both their worlds. Peter's ability to fly and his eternal youth could be combined with Merlin's powerful magic skills to create a really cool adventure.
One idea could be exploring a scenario where Merlin has to use his magic secretly to protect the relationship between Lancelot and Guinevere from the prying eyes of those who oppose it. Maybe he creates illusions to give them private moments.
Perhaps a dark wizard in the Fantastic Beasts world tries to use Merlin's power for evil. Merlin has to team up with Newt and Tina to stop this wizard. Along the way, Merlin discovers new magical abilities within himself as he faces the different magical challenges presented by the Fantastic Beasts world.
Another plot could involve Merlin traveling to the future. He might see a desolate Camelot, destroyed by some unknown force. Then he has to return to his own time and figure out how to prevent this dark future from happening. This would involve him using his magic in new and creative ways to influence the present to change the future.
Well, a plot could involve Merlin being undercover as a new student who is actually there to protect the school from a dark magical force that only he can sense. He might have to form an unlikely alliance with the school outcast who turns out to have some latent magical ability. Or he could be in a situation where he has to participate in a school magic competition while hiding his true power level.