Well, there are several interesting characters for Harry Potter potion class fanfiction. Snape, of course, as he is the potions master. But you could also include some of the house - elves. Imagine a house - elf who has some secret knowledge of potions and helps a student in need. Another character could be Hagrid. He might visit the potion class to show the students some rare ingredients he has collected from the Forbidden Forest. And then there are the ghosts of Hogwarts. The Bloody Baron could be lurking around the potion class, and his presence could add an eerie atmosphere. You could also write about some of the older students who act as mentors to the younger ones in the potion class.
Well, in a Harry Potter potion class fanfiction, you could have a plot where a new student from a very different magical culture joins the class and has their own unique approach to potion - making. This could lead to some interesting exchanges with Snape or other students. Or perhaps there's a mystery surrounding a particular ingredient in a potion that the students have to figure out. It might be that this ingredient is being hoarded by a dark wizard, and the students' discovery of it puts them in danger. Also, a fun idea could be that a student accidentally switches two ingredients in a potion and creates a brand - new potion with unexpected but useful effects.
Hermione Granger might also be a main character. Given her intelligence and thirst for knowledge, she could be researching the truth potion, its properties, and how to counter its effects if it's being misused.
Some cool potion ingredients in Harry Potter fanfiction are the fangs of a werewolf. These could potentially be used in a potion to control the werewolf transformation or to gain some of the werewolf's enhanced senses. Moonstone dust is also a great one. It has a connection to the moon and in fanfiction might be used in potions related to lunar magic, like a potion that only works during a full moon. And let's not forget the blood of a vampire. It's a rather dark ingredient, but in fanfiction it could be used in a potion to gain immortality or some form of dark power, although using it would likely be very controversial in the wizarding world.
There are also some original characters created in fanfiction who are potion geniuses. These characters can bring new storylines and perspectives to the world of Harry Potter potions. They might have unique ways of brewing potions or discover new potion recipes that change the magical world.
Hermione Granger also shows up a lot in Potion Master fanfiction. Since she was always so good at academics, including potions, she might be the protégé of the Potion Master or even collaborate with them on some new potion - related project. Additionally, characters like Draco Malfoy can be popular. He could be a rival to another character in the potions classroom, or perhaps he has a change of heart and becomes interested in the art of potion - making under the guidance of the Potion Master.
Hermione Granger would also be a great addition. She could use her extensive knowledge from the library to help solve problems in the Herbology plot. Maybe she discovers a hidden section in the library about a lost herbology technique and tries to bring it back to the modern - day Hogwarts Herbology class.
A great plotline in such fanfiction could be a Potion Master being framed for creating a harmful potion. The real culprit might be someone trying to discredit the Potion Master for personal gain, like a rival for a teaching position at Hogwarts. The Potion Master then has to prove their innocence while also dealing with the chaos that the false accusation has caused in the wizarding community. They might have to enlist the help of their students or former colleagues to clear their name.
One interesting 'Love Potion' fanfiction could be about a character accidentally drinking a love potion meant for someone else. This could lead to all sorts of comical and chaotic situations as they start to have strong, uncharacteristic feelings for another person.
One idea could be a story where a young, inexperienced wizard accidentally creates a super - powerful luck potion. This potion not only brings good luck to the creator but also starts to affect the whole Hogwarts in unexpected ways, like making the Quidditch team win every game without much effort or students getting top grades without studying hard.
In some fanfictions, the purity potion might be used to test a character's moral purity rather than just blood purity. For example, it could show if a character has pure intentions in their actions.