Hermione would probably be fascinated by the new magical knowledge that comes with the Japanese - influenced setting. She might be seen studying ancient Japanese spells and trying to find connections between them and the ones she already knows. And she might be wearing a kimono in a more proper and traditional way compared to the others.
He could wear a kimono to show cultural exchange. Hogwarts is a place full of different cultures, and a kimono is a significant part of Japanese culture. Wearing it might be a way for Harry to embrace and celebrate that culture within the wizarding world.
Harry himself could be more of a mechanic - wizard. He might wear goggles and have a toolbelt with magical tools that look like steampunk gadgets. His glasses could be enhanced with steampunk tech to see magical auras better.
Harry would be different in that he'd have to master both wizardry and shinobi skills. He'd be more stealthy and agile, like a shinobi. Instead of just relying on his wand, he'd also use ninja weapons. Hermione would probably study both shinobi techniques and magic with equal enthusiasm, making her even more of a know - it - all, but in a cool way. Ron might struggle a bit more to adapt as he's used to the traditional wizarding ways, but he'd also become more physically capable.
Harry would be the most different. Instead of just being a wizard fighting against Voldemort, he would have an air of mystery about him. He might be more solemn, as his connection to the death god would give him a different perspective on life and death. His eyes could glow sometimes, showing his newfound power.
Another aspect could be that in a fanfic set in a more open - minded Hogwarts, there is a club for students to explore different cultural dress styles and cross - gender fashion. A character like Draco might initially be against it but then find himself intrigued when he sees the beauty and uniqueness of a kimono - inspired crossdress look. This could lead to character development and new friendships or rivalries within the fanfic.
One possible plot could be that Harry Potter is transported to a magical realm in Japan where he has to adapt to wearing a kimono while still facing his usual challenges like fighting dark wizards. Maybe he discovers new spells that are unique to this Japanese - inspired magical world and has to use his knowledge of both Hogwarts magic and the new magic he learns there to save the day.
For Harry, a different potions class might make him more interested in the subject. Since he often had a tough time with Snape, a new teacher or teaching style could make him see potions in a new light. He might start to enjoy the process of making potions and even excel at it. Hermione, on the other hand, would probably adapt quickly to any changes. She might use the new opportunities in the class, like new potions to study, to expand her knowledge even further.
Well, Harry could be more confident in his own power. In the normal series, he had doubts about his abilities at times. But in this scenario, if he's set on destroying Snape, he has to be certain of his magic. He would be more decisive, not hesitating to use his skills against Snape. Also, his relationships with other characters might change. Some might see him as too aggressive in his pursuit of Snape, while others might support him wholeheartedly, creating a divide among his friends.
If Harry Potter was the creator of fanfiction, the fan community would be in chaos. Since he is a character in the story, his view would be very limited. Fanfiction usually allows for a wide range of creativity from different fans' perspectives. His versions might be too focused on his own personal experiences and not cover the full scope of what fans like to explore in the Potterverse, like different pairings or alternative timelines.
Hermione and Ron might not become friends in the same way. Since Harry was the catalyst for their friendship at Hogwarts, without him there, they might not cross paths as easily. Hermione could be more focused on her studies alone in a different school, and Ron might be stuck in his family's shadow without Harry to bring out his better qualities.