Among the older students, Hermione might be one to read Harry Potter fanfiction. She has a thirst for knowledge and a love for books, so she might be interested in seeing how other fans have built on the Potter world. Ginny Weasley, too, as she has a strong connection to Harry and the events at Hogwarts. She might want to see different takes on their story. Even some of the Ravenclaw students, known for their love of learning and creativity, would be likely candidates for reading fanfiction.
The younger students at Hogwarts are quite likely to read Harry Potter fanfiction. They are at an age where they are really into the wizarding world and would be curious about different interpretations. Students like Colin Creevey, who is a big fan of Harry, might be eager to read fan - created stories about his hero. Also, the members of Dumbledore's Army, such as Luna Lovegood and Neville Longbottom, seem like the types who would be open to exploring fanfiction.
Outside of Hogwarts, some of the wizarding families' younger members could be reading Harry Potter fanfiction. For example, the Weasley cousins who are not at Hogwarts yet might be introduced to the fanfiction world by their older siblings. Also, any young witches or wizards who idolize Harry Potter from afar would be eager to get their hands on fan - made stories. And perhaps some of the Hogwarts graduates who are still in touch with the wizarding world might also read fanfiction to relive their Hogwarts days in a different way.