One interesting plot could be an assassin who is secretly a double agent within Voldemort's ranks. They pretend to be working for him but are actually protecting Harry Potter and his friends.
Perhaps there's a plot where an assassin has a change of heart after being sent to kill a Hogwarts student. The assassin then decides to help the student uncover a dark conspiracy in the wizarding world. In 'harry potter assassin fanfic', this could add a lot of mystery and moral complexity.
One interesting plot could be that the main character, who has assassin skills, is secretly protecting Hogwarts from a new and unknown dark threat that the regular wizards can't detect easily. They use their unique combat skills along with magic to keep the school safe.
A plot where the village is suddenly under a dark spell and the young wizards and witches from Hogwarts have to work together to break it. They'll face challenges like deciphering ancient runes and battling dark creatures. This would be a great opportunity to see different characters' skills and teamwork.
One interesting plot could be the characters going on a magical camping trip during the vacation. They might encounter new magical creatures in the forest that are not well - known in the original books. For example, a group of friendly forest sprites that lead them to a hidden glade filled with enchanted plants.
One interesting plot could be the hunter's unique adventures within the wizarding world. Maybe he discovers hidden magical creatures that Harry Potter and his friends haven't encountered yet.
It could be that the assassin was initially a victim of some dark wizard's experiment. Harry, being the hero he is, feels responsible for the child and decides to raise him. In the process of raising, he unknowingly nurtures the assassin-like qualities in the child because of the unique circumstances and challenges they face together.
One common plot could be revenge. Maybe she's out to avenge the death of someone she loved, using her assassin skills. Another could be that she's part of a secret organization that uses her unique position as Harry Potter to achieve their assassin - related goals.
A really interesting plot could be a time - travel fanfic where Dobby, Hagrid and Harry Potter are sent back in time. They end up in the era when Hogwarts was first built. Dobby has to figure out how to blend in as a house - elf in this different time period, Hagrid is amazed by the primitive but still wonderful magical creatures, and Harry Potter has to deal with the fact that he might change the course of Hogwarts' history. They all work together to make sure that they return to their own time safely while also learning a great deal about the origins of Hogwarts.
Well, in some Harry Potter marriage law fanfic, a plot could revolve around a character who discovers a loophole in the marriage law. This could lead to a whole series of events where they use this loophole to either help themselves or others in their relationship situations. Maybe a character wants to marry a Muggle - born, which is restricted by the law, and they find a creative way around it.
One interesting plot could be a group of students accidentally stumbling upon a long - forgotten forbidden magic spell in the Hogwarts library. They then have to figure out how to deal with the power and secrecy of it without getting caught by the teachers.
One interesting plot could be Merlin using his ancient magic to protect Harry from the Dursleys in a more magical and direct way than in the original story. Maybe he creates a magical shield around the house that only allows good magic in and keeps out any harm intended for Harry.