Yes, in some fanfictions, Merlin's sister might have special powers. For example, she could have the power of foresight like Merlin has magic but hers is more focused on seeing future events. This can add an interesting dynamic to the story as she might use this power to help Merlin in his quests or to avoid danger.
In many fanfictions, they have a very close relationship. Merlin often looks out for his sister and she does the same for him. They share secrets, especially about Merlin's magic, and support each other through difficult times.
Morgana could be a great antagonist. She might see Merlin's sister as a threat to her own plans for Camelot. Maybe she discovers that Merlin's sister has a power that could undermine her magic or her influence over the court.
Maybe Merlin's sister is sent on a secret mission by the Lady of the Lake. She has to journey to a far - off land to retrieve a magical artifact that is crucial for the future of Camelot. Along the way, she meets various characters and overcomes many challenges, all while keeping her identity as Merlin's sister a secret.
One common theme is the bond between siblings. Since they are twins, their connection is often portrayed as very strong, and they rely on each other in different situations.
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.
Merlin's relationship with Arthur could become even stronger. They might have more adventures together and truly become equals in their fight for Camelot. Their bond could be tested, but in the end, it would only grow deeper.
Well, one prediction could be that Merlin discovers a new form of magic. Maybe he'll find an ancient spell book that has been lost for centuries. This could lead him on a journey to master this new magic, which might be different from the magic he already knows. He could face challenges along the way, like dealing with other wizards who are jealous of his discovery.
It could change in several ways. If Merlin's twin sister is also part of Arthur's court, Arthur might be more protective of both of them, seeing them as a pair. Or, he could be more suspicious of Merlin if his sister has a different approach to magic. Maybe she's more open about it, which makes Arthur question Merlin's secrecy.
One great Merlin Arthur little sister fanfiction is 'The Sister's Secret'. It delves into how the sister's presence affects the dynamic between Merlin and Arthur. Another could be 'A Sister's Destiny' which focuses on the sister having a unique magical ability that she must hide. And then there's 'The Little Sister's Influence' where she subtly changes the fates of those around her.