In Harry Potter fanfic, the red string of fate could be part of an ancient magic. Maybe it's related to the founders of Hogwarts. For example, if the red string links two students, it could be a sign that they are meant to revive an old magic together. In Twilight fanfic, it could be a supernatural element from a different culture. A vampire might discover that the red string of fate connects them to a human in a way that defies their natural instincts.
In fanfics, the red string of fate can be a creative device. For Harry Potter, it could be a magical string that only certain magical beings can see. It might show a connection between a wizard and a magical creature. In Twilight, it could be something that the Volturi are aware of and use to manipulate relationships. For instance, they could try to sever the red string between a vampire and a human to stop a potential powerful union.
In some Twilight fanfics, string theory might be incorporated in a very creative way. For example, it could be used to explain the existence of the vampire's superhuman abilities. Maybe the strings are what give them their strength or speed, as if these strings are some sort of supernatural energy source within their bodies. It's a really cool concept that can add a scientific - fantasy blend to the Twilight universe.
I'm not sure exactly, as it can vary depending on the specific fanfic. You might need to read it carefully to find out.
It could be a reference to a certain character's look or attitude. Maybe there's a new character in the fanfic who has a steely gaze, and the author describes it as 'blue steel' to give a sense of mystery and cold determination. This character could be an ally or an enemy to Harry and his friends, adding a new layer of intrigue to the story.
One way is to make it a spell or a curse in the Harry Potter world that somehow spreads to the Twilight world. For instance, a dark wizard creates the 'Love Me Dead' spell and it starts affecting the vampires and werewolves in Twilight, making them lose their ability to form normal relationships.
Well, he could be a new student at Hogwarts who's a bit older than the others. Since he has his unique way of seeing things, he might be sorted into Ravenclaw for his intelligence and ability to analyze. In the fanfic, he could start investigating some strange happenings around the school that seem related to the Forbidden Forest, using his profiling skills to figure out if there's a 'human' or rather a wizard or magical creature behind it all.
You could make the succubus drain be part of a curse that was placed on Hogwarts long ago. Maybe it was put there by a dark wizard who wanted to weaken the school's magic. In the fanfic, the characters start noticing that students are getting weaker and tired all the time. They then discover the source is a succubus draining their energy, and they have to search through old books and magic spells to find a way to break the curse.
One way is to create a new Ministry department that deals with magical taxes. You could write about how this department audits wizarding businesses. For example, Ollivander's wand shop might be audited for taxes on the sales of wands. Another way is to introduce a tax on magical creatures. Hagrid might have to deal with the new tax regulations for his care of magical creatures at Hogwarts.
Well, 'Harry Potter' candy can be used as a plot device in fanfics. For instance, a poisoned candy could be sent to a character, leading to a mystery of who the culprit is. It could also be a way to show friendship, like when a character gives their favorite Honeydukes candy to another as a sign of loyalty.
In a more literal sense, if we think about a positive battery in a fanfic, it could be a new invention. Maybe a wizard in the Harry Potter world teams up with Tony Stark. They create a positive battery that uses both magic and technology. This battery could power a device that can nullify dark magic and the weapons of villains from both universes.