Luna Lovegood could play an interesting role. She might see Harry's drunken state as just another form of being 'different' and start having deep, nonsensical conversations with him. The Weasley twins could also be involved, either joining in on Harry's crazy antics or trying to use his drunken state to test out some of their new prank products on him. And Professor McGonagall would be there, scolding Harry and trying to restore order to the chaos he's causing.
Neville could be in it too. He might be initially shocked to see Harry in such a state but then tries to help by using some of his herbology knowledge to make a potion to counteract the drunkenness. And Malfoy could show up, taking the opportunity to mock Harry until Harry, in his drunken craziness, does something that scares Malfoy off. Also, Hagrid would surely be around, being concerned about Harry and trying to get him to rest in his hut.
I think Dobby could be an important character. Since Harry is raising himself, Dobby might take it upon himself to secretly help Harry. He could provide some food and small comforts when Harry is all alone. Another character could be Hedwig. She would be more than just a pet; she could be Harry's only true companion, helping him in small ways like delivering messages or even warning him of danger.
Maybe some of the Hogwarts professors could be involved. For example, Professor McGonagall could be concerned about Harry's new situation and offer her guidance. There could also be some descendants of previous island owners or caretakers who have their own interests in the island. They could either be friends or foes to Harry, adding more complexity to the story. Additionally, some magical creatures native to the island could be almost like characters themselves, interacting with Harry in unique ways.
Well, one possibility could be that drunk Harry starts casting random spells all over Hogwarts. He might accidentally turn the Great Hall into a giant ice rink or make the portraits start singing opera. Another idea is that he thinks he's on a wild adventure and tries to 'fight' imaginary enemies, causing chaos in the corridors.
Hermione would most likely be one of the main characters. She's always observant and caring towards Harry. So when she notices something is off with Harry, she would do everything in her power to figure out what's wrong and help him. She might use her extensive knowledge of magic to find a solution to his emotional distress.
Obviously, Harry Potter himself would be the central character as the title implies. Hermione and Ron would most likely be involved as well, since they are Harry's closest friends. They would probably be the ones trying to figure out what's wrong with Harry and how to fix him. Dumbledore could also play a big role, as he often has the wisdom and power to deal with strange situations.
Voldemort is often a key character. Since Harry is going dark, Voldemort might play a role in either guiding him into darkness or being an antagonist to his newfound dark power. Another common character is Hermione. She might try to save Harry from the dark path he's on, leading to a lot of conflict between them.
Well, obviously Harry Potter himself is the central character. Hermione and Ron are almost always involved too. They would be the ones trying to figure out what's wrong with Harry and how to fix him. Dumbledore might also play a major role, as he often has deep knowledge about magic and could potentially help Harry regain his sanity.
One of the well - known characters is Sirius Black. In rebellious fanfiction, he might return in a more powerful way and help Harry in his rebellious endeavors. His knowledge of the dark side of the wizarding world and his own experiences as an outcast could be very useful. Neville Longbottom can also be a prominent figure. He could grow into a strong ally of Harry's rebellion, using his new - found confidence to stand up against the things that are wrong in the wizarding world. And Luna Lovegood, with her unique perspective on the wizarding world, could inspire Harry to think outside the box and rebel in more creative ways.
Hermione would surely be involved. She could be Harry's research partner, helping him find relevant medical information in books and scrolls. Her intelligence and thirst for knowledge would be very useful in exploring new areas of medical magic. Another character could be Madam Pomfrey. She could be Harry's mentor, teaching him the basics of wizarding medicine and guiding him in his new role as a medic.
Obviously, Harry Potter himself is the central character. Hermione and Ron would most likely be involved too. They would probably try to find a way to get Harry out of Azkaban. Dumbledore might also play a role, perhaps guiding Hermione and Ron from behind the scenes or even trying to influence the wizarding court to re - evaluate Harry's case.