One possible plotline could be Harry exploring his magical abilities in solitude. He might discover new spells or magical artifacts that he keeps to himself. Another could be him building a secret sanctuary where he can retreat from the wizarding world's chaos.
One character could be Dobby. Even though Harry is living alone, Dobby might still find a way to visit him and offer his help. Another could be the Hogwarts ghosts. They can pass through walls and might visit Harry in his solitary abode.
Yes, there are likely many fanfictions where Harry Potter is depicted as living in Potter Castle. Fanfiction writers often like to explore different scenarios for their favorite characters, and having Harry live in his family's castle could be an interesting concept.
In this fanfiction, Percy living alone could mean a whole new set of adventures. Maybe he's chosen to isolate himself after all the chaos in the demigod world. He could be exploring his powers in solitude, away from the distractions of Camp Half - Blood. It also might lead to some self - discovery as he doesn't have to rely on his friends all the time.
Hermione could still be a common character. Even in fanfiction where Harry is alone, Hermione might be mentioned in his thoughts or in flashbacks as someone who has influenced him. For example, he might recall her advice on how to study magic when he is facing a difficult spell alone.
In this kind of fanfiction scenario, it would be really interesting. Harry might have to adapt to Japanese culture while still having his magical abilities. Maybe he would attend a Japanese wizarding school that has some unique features inspired by Sekirei. For example, the school could have some sort of spirit - like the Sekirei - associated with it in a magical way.
I'm not sure specifically as I haven't read that exact fanfiction. But it might be a story where Harry Potter somehow ends up on Naboo (from the Star Wars universe) and has all sorts of adventures there. Maybe he uses his magic in a world that's very different from the wizarding world he's used to.
It contributes by providing more content for fans to enjoy. When fans read this fanfiction, they can explore different ideas and scenarios that keep their love for the Harry Potter world alive. It also encourages creativity among fans. They can discuss and share their thoughts about the fanfiction, which strengthens the sense of community within the fandom.
One interesting story could be about Harry facing challenges alone in the Forbidden Forest. Maybe he discovers a hidden magical creature that no one else knew about and has to figure out how to deal with it on his own.