In 'Harry Potter the Devil fanfiction', Harry is surely a main character. But we may also see some minor characters from the original series taking on more prominent roles. For instance, Neville Longbottom could play a crucial part in combating the devil - influenced forces. And there could be a mysterious character, perhaps a dark wizard from the past who has some connection to the devil and resurfaces in this fanfiction to cause chaos. The character interactions among these various characters would be what drives the story forward.
It's likely that Harry Potter himself remains a main character. Since it's a fanfiction related to the Harry Potter series, he would probably be at the center of the story, dealing with the devil - related elements. Hermione and Ron might also be main characters, as they are Harry's closest friends in the original series and would likely be involved in whatever strange events are happening in this fanfiction.
Well, apart from the classic trio, there could be new characters introduced specifically for this fanfiction. Maybe a devil - like figure who is the main antagonist. This character could have unique powers and motives that are related to the devil concept. There might also be some characters from the wizarding families who have a special connection to the devilish happenings, and they become important in the story as they either help or hinder Harry and his friends.
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