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 fanfic plots, 'Harry Potter' candy can play a crucial role in magical transformations. Maybe there's a candy that when eaten, temporarily turns a character into an animal, just like the Animagus transformation but more unpredictable. This could lead to all sorts of adventures and misadventures as the character tries to navigate their new form and the situations it gets them into. Another way is that certain candies could be used to break spells. For example, a character is under a silencing spell and the only way to break it is by eating a specific, rare candy that has counter - spell properties.
Jewelcraft can be incorporated into plots as a quest. For instance, the characters may need to find a special jewel for a powerful spell, and they have to search for someone skilled in jewelcraft to create or modify it. Another way is by having a jewelcraft competition in the wizarding world, which the main characters enter to prove their skills or gain recognition.
Characters could also use the 'carpe diem' concept when it comes to magical discoveries. They might stumble upon a new potion ingredient and instead of thinking too much, just start experimenting right away. This can lead to new magical breakthroughs in the fanfiction and also show their adventurous spirit. Well, it's like they know that if they don't act now, they might miss out on something amazing. And this kind of plot element can keep the readers on their toes, eager to see what comes next.
It could be a mysterious figure that the main characters have to seek out. For instance, they hear rumors about 'master dada' being the key to solving a big mystery at Hogwarts, like a series of disappearing objects. So they embark on a quest to find out who or what 'master dada' is.
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.
The defenestration spell could be incorporated as a key plot device. For instance, if there's a mystery about a series of 'window - related' incidents in Hogwarts, and Harry suspects the defenestration spell is involved. He then starts to investigate who might be using it and for what purpose.
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.
They can be incorporated as new magical creatures in the Forbidden Forest. Maybe they have their own hidden enclaves there and interact with Hogwarts students who stumble upon them. For instance, a faery hero could offer help to a lost student by using its faery magic to guide them back to the castle.
It could be a magical place that characters from both universes are drawn to. For example, Frodo from 'The Hobbit' might be lured to 'Over the Rainbow' by a strange magic, and there he meets Harry Potter. They then have to work together to return to their respective worlds.
One way is to have it as a guide. For instance, a young wizard or witch could be lost in a forest near Hogwarts, and a blackbird flying overhead could lead them to safety, like to a hidden passage or an old, forgotten hut that holds some important magical item.