Well, it could be really strange for him. He might find some of the interpretations of his life and adventures quite off - putting or amusing. Maybe he'd be shocked to see how some fans have romanticized his relationships in ways he never thought of.
He might be quite amused. Fanfics often contain different interpretations of the characters and the wizarding world. He could find some creative ideas in them that he never thought of before, like unique magical spells or new backstories for his friends.
He may be confused at first. Fanfics can be very different from his real experiences. He might wonder why people write such things about him and his world.
There's a fanfiction titled 'Harry Potter: Albus's Destiny'. It focuses on how Albus Severus Potter discovers his own unique path in the wizarding world, different from his father's. It's a great read as it shows his struggles and how he overcomes them.
Yes, it's completely normal. Harry Potter has a huge and detailed world, and fanfiction allows fans to explore parts of it that the original books might not have covered fully. It gives people a chance to imagine different scenarios for their favorite characters, like what if Harry had been sorted into Slytherin? So it's natural for your friend to be into it.
A popular Litrpg Harry Potter fanfiction is 'Gryffindor's Ascension'. In this story, the characters are more aware of their skills in a Litrpg sense. For example, they can see their magic power levels. It's a really interesting concept that adds a new layer of depth to the Harry Potter universe. There's also 'Slytherin's Redemption' which has a great plot that incorporates Litrpg features like quests and rewards within the Hogwarts setting.
I really like 'Ghostly Encounters in Hogwarts'. This fanfiction delves into the idea of Harry being able to see and interact with ghosts in a way that no one else can. It shows his unique connection to the spirit world within Hogwarts, and the adventures that come with it are quite exciting. It also has some great character development for Harry as he learns more about the ghosts and their stories.
There's a fanfiction called 'Cedric's Unfinished Story'. In this one, it explores what could have happened if Cedric had survived the Triwizard Tournament. It's really interesting as it weaves new adventures for Cedric, involving him in the fight against Voldemort in a different way.