In addition to the trio, there could be characters like Draco Malfoy. He might be even more antagonistic towards Harry if he is seen as the 'Snake Boy', either out of jealousy or fear. Professor Snape could also play an important role. Given his own connection to the snake - like House of Slytherin, he might have some insights or conflicts regarding Harry's newfound snake - nature. And there could be some original characters created specifically for the fanfic who are also involved with Harry's snake - related adventures.
The main characters would still revolve around Harry Potter. But there could be other minor characters from the wizarding world that are brought into focus because of Harry's 'Snake Boy' status. For example, the caretaker Filch might be constantly on edge around Harry, fearing his snake - like abilities. Or some of the students from the Slytherin house could either befriend or oppose Harry based on his snake - related qualities. There might also be some magical creatures related to snakes, like Nagini, who could have a different role in the fanfic compared to the original books.
In addition to Harry, there could be a unique snake character that is a main character. This snake could have its own personality and motives. It might be a magical snake that has been around for a long time and has knowledge of hidden secrets in the wizarding world. Dumbledore could also be a main character as he often guides Harry in the original series and would likely do so in this fanfic as well, especially with Harry's new snake - related situation.
Hermione and Ron might also be main characters in this fanfic. They often accompany Harry on his adventures in the original series, so it's reasonable to think they'd be involved here. They could help Harry figure out the mystery of the snake.
The Basilisk from the Chamber of Secrets also features a lot. Fanfics might give it a different backstory or a different role in the wizarding world. For example, it could have been an ancient guardian that was misused by Salazar Slytherin's descendants.
Obviously, Harry Potter is one of the main characters. And the snake, which could be a unique creation within the fanfiction, is also a main character. It might have its own personality and abilities that are different from normal snakes in the Harry Potter universe.
Obviously, Harry Potter would be one of the main characters. And the snake, which plays a crucial role as per the title. There might also be other characters from the original series like Hermione and Ron, who could interact with Harry in the context of his new relationship with the snake.
In some fanfictions, Voldemort could also be a key character in relation to the snake king. Since Voldemort had a connection with snakes, he might either be in conflict with the snake king for power or try to control it. Additionally, there could be original characters created for the fanfiction. For example, a young wizard who has a special gift for understanding snakes and becomes the mediator between the snake king and the human wizards. This character could bring a fresh perspective to the story and help in building a relationship between the two very different worlds of humans and the snake king.
One interesting 'Snake Boy Harry Potter fanfic' could be about Harry having a special connection with snakes that goes beyond Parseltongue. For example, he might be able to communicate with the basilisk in a more profound way, leading to new adventures in the Chamber of Secrets. Another could be where he is seen as a 'Snake Boy' by the wizarding world and has to deal with the prejudice and mystery that comes with it.
Obviously, the Head Boy himself is a very popular character. He is often depicted as strong - willed, intelligent, and with a sense of justice. Harry Potter might also be a popular character as he could interact with the Head Boy in various ways, like giving advice or getting involved in some adventures together.
Harry is the central figure in 'harry turns into a snake fanfic'. In addition to his closest friends, there could be some new characters introduced. For instance, an old wizard who specializes in transfiguration gone wrong. This wizard could be a hermit living on the outskirts of the wizarding world. He might have the key to understanding Harry's transformation and reversing it. And we can't forget the snakes themselves. There could be a particularly intelligent snake that befriends Harry in his new form and helps him in his journey.
In some cases, it could be a character related to one of the main characters from the books. Like a long - lost cousin of Harry Potter who is a snake animagus. This would add a new dynamic to the story and connect it to the original plot in an interesting way.