Maybe a dark spirit that has been awakened by the combination of the different magics in the world of Camelot and the Smurf village. This dark spirit is envious of the positive forces and wants to destroy them. It targets Merlin, Arthur, and the Smurfs because they represent hope and goodness.
It could be an evil sorcerer who wants to control both Camelot and the Smurf village. He sees the power in Merlin and Arthur's connection, and the unique magic of the Smurfs, and wants it all for himself.
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.
Merlin was a powerful wizard. He was Arthur's mentor and advisor.
Obviously, Merlin and Arthur are the main characters. Merlin, with his magical abilities and his role as Arthur's servant and friend. Arthur, the king who is destined for great things and has a complex relationship with Merlin.
Merlin would likely be seen as a bit of an enigma at Hogwarts. His magic is different from the norm, so he might be a bit of an outsider at first. But his kind heart and loyalty would soon win over his classmates. Arthur would be the brave and headstrong character, perhaps a bit like a Gryffindor version of his usual self. He'd be eager to learn about combat magic and would probably be a natural leader in group projects or Quidditch teams.
Obviously, Merlin and Arthur are main characters. The little sister, whose name varies in different fanfictions, is also a central figure. There might also be other characters like Guinevere who could interact with the sister in various ways.
The main characters are Arthur, who represents the royalty and leadership. Merlin, the wielder of magic with a big secret. And the knights such as Lancelot, who is known for his honor, and Gwaine, known for his fun - loving attitude. They all interact in the fanfiction as the knights watch Merlin, and their relationships and actions drive the story forward.
Arthur is the leader, with his sense of honor and duty. Merlin is the magical force behind the group, always using his powers secretly to protect them. The knights are like a band of brothers. For example, Gwaine is the fun - loving and somewhat reckless one, while Percival is the strong and silent type. All of them together make up the core of the story in this fanfiction.
Merlin is a powerful wizard in the King Arthur story. He is often seen as a mentor and advisor to King Arthur. He uses his magic to help Arthur in various ways, like guiding him to pull the sword from the stone which established Arthur as the rightful king.
Merlin is a powerful wizard and advisor to King Arthur. He plays a crucial role in guiding and supporting Arthur throughout his adventures.
It would become much more complex. They might start off being confused and a bit awkward around each other. But then, as they start to explore their feelings, they could become closer in a more intimate way. Their friendship would be transformed into something deeper, with a new level of understanding and trust.