Morgana could be a key figure as well. Given her complex relationship with Merlin in the original show, in the fanfiction, Merlin might share secrets with her in an attempt to either redeem her or prevent her from causing more harm. This would create a tense and engaging plotline.
Obviously, Merlin is a main character. He is the one with the secrets to share. Arthur might also be involved as he is often at the center of Merlin's world in the original series, and the secrets could be related to Arthur's fate or the future of Camelot.
Gwen could be a main character in some fanfictions. Maybe Merlin shares secrets with her, and she uses this knowledge to help the people of Camelot in a more direct way, being the queen. Her reaction to Merlin's secrets could also add an interesting dynamic to the story.
The main character is the narrator who becomes the secret sharer's confidant. And of course, the secret sharer himself is also a very important character.
Obviously, Harry Potter is a main character as the heir of Merlin. Hermione Granger is often included as she helps Harry figure out the implications of his new status and the mysteries that come with it. Ron Weasley might also be there, providing his usual loyalty and friendship.
Obviously, Naruto is often a central character. His journey to discover and master new secret powers is a common theme. Sasuke is also frequently involved, either as a rival or an ally in the exploration of these powers.
The two main characters are the narrator, who is the captain of the ship, and Leggatt. Leggatt is the secret sharer who has escaped from another ship and is being hidden by the narrator on his ship.
In 'The Secret Sharer', the captain is a main character. He is the one who has the encounter with Leggatt, the secret sharer. There are also the crew members on the ship, who play important roles in the overall atmosphere of the story.
One interesting story could be about Merlin sharing his magic secrets with a newfound friend in the fanfiction. This might lead to them going on adventures together, using magic in unique ways to solve problems.
Alina is also frequently involved. Her connection to the Darkling in the original work makes her a natural addition in many fanfictions. Their complex relationship can be further explored or even rewritten in different ways in fanfiction.
Obviously, Merlin is the central character. His character is the focus as he returns and the story usually revolves around his actions, decisions, and how he impacts the world around him again.
Naruto himself is often a central character in 'naruto destruction fanfiction'. Since he is the main protagonist of the original series, fanfiction writers like to put him in situations where he has to deal with destruction. Sasuke is also frequently involved as his rival, and their relationship can be explored in the context of destruction, like if they have to work together to stop a greater threat of destruction.
Obi - Wan Kenobi is frequently in Anakin Snaps fanfiction. As Anakin's master, he has a big role to play. Their relationship is often explored, and Obi - Wan's reactions to Anakin's snapping are crucial. Sometimes he tries to bring Anakin back from the brink, while other times he might be the cause, albeit unintentionally, of Anakin's breakdown.