Merlin is key. His mentor Gaius is likely to be in the fanfiction as well. Gaius might be disappointed that others forgot Merlin's birthday and try to do something special for him. There could also be other minor characters from Camelot who add to the overall atmosphere of the story, like the servants or the knights who Merlin has befriended. Their reactions to the forgotten birthday can range from indifference to remorse.
Well, obviously Merlin is one of the main characters since it's his birthday that's being forgotten. Arthur is often another main character. He might be one of those who forgets, or he could play a role in trying to make up for the forgetfulness later. Gwen could also be a main character, perhaps being too busy with her own tasks to remember Merlin's birthday.
It could. In many fanfictions where everyone forgets Merlin's birthday, it might end sadly as Merlin feels isolated and unloved. He might have expected at least one person to remember, and when no one does, it could lead to a melancholic conclusion with him feeling deeply disappointed and alone.
Obviously, Percy would be the main character. His friends like Annabeth, Grover, and the others from his group would also be important characters. They are the ones who forget his birthday, so they play a big part in the story as they deal with the consequences of their forgetfulness.
There's a chance it could be Shikamaru. Despite his laid - back attitude, he is quite perceptive. He might notice Naruto's subdued mood and put two and two together, realizing it's his birthday. Then he could rally the others to quickly put together a belated celebration for Naruto.
Typically, Merlin is a central character. He's the one with the magic and the kind heart that can potentially break the curse. The Beast is another main character. This could be a character with a tragic past, like a prince who was cursed by an evil sorcerer. In addition, characters like Morgana might also make an appearance. She could either be a hindrance, trying to use the situation for her own gain, or a helper in some unexpected way.
Then there are characters like Lancelot who can be Merlin's loyal friend. He could be the one who stands by Merlin when his magic is discovered or when he is in trouble at school. These characters, with their different personalities, create a rich tapestry of relationships and storylines in Merlin high school fanfiction.
Well, the plot could be about Percy feeling really sad and left out when everyone forgets his birthday. Maybe he starts to question his friendships. He could go off on his own for a while, and then his friends realize their mistake and try to make it up to him with a big, surprise celebration.
Well, Naruto could initially be shocked that no one remembers. But then he might try to play it cool, because that's his nature. He could also think that they might be planning a surprise later. However, as time passes and still no one remembers, he would start to feel really down. He might even go off on his own to brood about it, wondering if he's not as important to his friends as he thought.
Obviously, Peter is one of the main characters. Then it depends on the context of the 'everyone'. It could be his friends from school or a superhero team he's part of. So characters like his classmates, if it's a school - based fanfic, or fellow superheroes if it's in a superhero universe.
Often, we also see new characters being introduced. For example, a young sorcerer who Merlin takes under his wing. This new character can act as a sort of foil to Merlin, showing how much he has grown and changed. And sometimes, we might see the return of Morgana in a different form, either as a spirit guiding Merlin or as an enemy he has to face one last time. It all depends on the direction the fanfic author wants to take.
Often, there are other characters from the original Harry Potter series as well. For example, some fanfictions might include Hermione as a friend or mentor to the descendant. She can use her intelligence to help the main character understand their powers better. And of course, there could be some original characters created specifically for the fanfiction, like a mysterious wizard who also has a connection to Merlin's past.