Hermione Granger could also be a central figure. Given her intelligence and thirst for knowledge, she could be researching the Permanent Felix Felicis and its implications, and might accidentally consume it or use it in an experiment. She would then use her wits along with the potion's effects to navigate through various situations.
In many 'Harry Potter Permanent Felix Felicis Fanfiction', Ron Weasley could be one of the main characters. He often gets into all sorts of situations with Harry and Hermione, and with the addition of the permanent Felix Felicis, his character could have some really interesting developments. Additionally, some original characters created by the fanfiction authors might be main characters. These could be new students at Hogwarts who discover the permanent Felix Felicis and have to deal with the consequences.
One interesting plot could be a character using the permanent Felix Felicis to solve a long - forgotten mystery in the wizarding world. For example, they might discover the true origin of an ancient spell that has been lost in time. Another could involve a student using it to always ace their exams and then getting into some trouble when the professors suspect foul play.
A really cool plot could be where the Permanent Felix Felicis has some unforeseen side - effects. Instead of just bringing good luck, it starts to warp reality in small ways. The main character has to figure out how to reverse or control these effects while also dealing with the regular challenges at Hogwarts like exams and rivalries. This would add an element of mystery and danger to the story, making it more exciting.
Hermione Granger is also a popular choice. Given her intelligence and love for learning about potions, it's easy to imagine her either creating more Felix Felicis or using it in a clever way to solve a problem at Hogwarts.
One idea could be a story where a student who is usually very unlucky gets ahold of Felix Felicis. They use it to turn their academic and social life around, but then face the challenge of whether their newfound success is truly theirs or just the result of the potion.
Another character could be Draco Malfoy. There could be fanfiction where Draco, having been on the wrong side for a long time, now has a change of heart and wants vengeance against his own family or the Death Eaters who used him. He might use his knowledge of the Dark Arts that he learned from his family, but now turn it against them in a bid for redemption through vengeance.
Harry Potter himself could be one of the main characters in such fanfiction. Maybe he gets an automail limb after a particularly dangerous encounter with Voldemort. Hermione might also be involved, using her vast knowledge to help understand and improve the automail technology within the wizarding context.
Harry Potter himself is often a central character. Since he was the one destined to defeat Voldemort and destroy the Horcruxes in the original story, many fanfictions continue his journey with Horcruxes in new and different ways. Hermione Granger also features prominently. Her intelligence would be crucial in understanding the nature of Horcruxes and finding ways to deal with them.
Well, Harry Potter himself is often involved. Since he is the main character in the original series, in fanfiction with a genie, he could be the one to find the genie and interact with it. For instance, he might be the one to use the genie's wishes to save his friends or defeat his enemies.
Ron Weasley can also play an important role. He might be the one who accidentally causes an accident that sends someone to the hospital, and then feels really guilty about it. So he spends a lot of time in the hospital wing trying to make it up to the injured person, while also getting into some comical situations with the other patients and the Healers.