Ron could also play a crucial role. He might be torn between following Harry's new independent path and the more traditional ways. And of course, Dumbledore. Dumbledore always has his eye on Harry, and in this fanfic, he might be even more intrigued by Harry's decision to do his own thing and secretly guide him from the shadows.
There could be some new characters as well. Maybe a mysterious wizard or witch that Harry meets during his solo adventures. This character could have their own motives and knowledge that either helps or hinders Harry. Also, some of the minor characters from Hogwarts like Neville could step up and be more involved in Harry's new journey, as Harry is no longer following the regular fifth - year script.
Hermione would still likely be important. Even if Harry is doing his own thing, Hermione might try to keep him in line or offer her intellectual support.
Obviously, Harry Potter would be the main character. Since it's about him doing his own thing in his fifth year.
It could be about Harry deciding to take matters into his own hands in his fifth year at Hogwarts. Maybe he starts his own secret study group to learn advanced magic, away from Umbridge's interference.
Well, perhaps Harry decides to focus more on his own personal growth and magical skills. He might start exploring magic in his own unique way, away from the expectations of others.
There could be a local wizard who becomes Harry's mentor in a way. Since Harry is on his own, he might seek guidance from someone outside of his usual circle, like an old hermit - like wizard who has a lot of knowledge about the more hidden parts of the wizarding world.
Hermione could be important. She might be the one who encourages Harry to drop his mask, or she could be the first to notice the change when he does. Another could be Ron, as Harry's best friend, his reaction to Harry dropping his mask would be significant.
In addition to Harry, Ron, and Hermione, Neville could play a significant role. He has grown into a brave and respected figure. Also, Luna Lovegood with her unique perspective might be crucial. The professors at Hogwarts, like Professor McGonagall, could also be important. She might be in a difficult position, having to balance between supporting Harry and following the school and wizarding regulations.
Often, other characters from Hogwarts also play important roles. For example, Dumbledore might be in the background guiding Harry or observing Lucius' actions. Hermione and Ron, Harry's best friends, could also be involved as they are always by Harry's side during his fifth year and might interact with Lucius in some way.
Obviously, Harry Potter is the main character since it's about him living on his own.
His sensei, Iruka. Iruka has always been like a father figure to Naruto. He would be there with a big smile, giving Naruto words of wisdom and pride. His presence would mean a great deal to Naruto on such an important day.
Obviously, Harry and Snape are important. Then there could be Snape's mother. Maybe she has some secrets or a past that is intertwined with the wizarding world's dark history. Another important character could be Snape's father, who might have had an influence on Snape's upbringing.