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 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.
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.
The female characters would likely be more dominant. For example, Tsunade might have an even more powerful and overarching role in the shinobi world. She could be the one making most of the major decisions. The male characters, like Naruto, would have to adjust their behavior. Naruto might be more cautious in his actions as he is in a world where he is the minority. He would need to be more diplomatic in dealing with the female shinobi who hold most of the power.
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.
In such a fanfiction, Harry would be raised in a shinobi culture. Firstly, his upbringing would be centered around the values of the shinobi, like loyalty to the village and comrades. He'd learn to move silently, use weapons like kunai and shuriken. His Hogwarts - like education would be replaced with training in the ninja arts. His friends could be other young shinobi, and they'd go on missions together. Instead of using a wand for magic, he'd use hand signs and chakra to perform amazing feats. The story could also explore how his 'shinobi - like' thinking would influence the wizarding world if he ever returned to it.
If Harry Potter is adopted by the shinobi in fanfiction, it would be really interesting. Firstly, his upbringing would be completely different. Instead of growing up with the Dursleys, he'd be in a shinobi village. He'd have to adapt to their way of life, which includes things like rigorous training from a young age. His magical abilities might be seen as something special even among the shinobi. They could try to incorporate his magic into their strategies. Also, he'd probably make new friends among the shinobi kids, and together they could face various challenges, both magical and ninja - related.
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.
Harry Potter would be a central character. There may be some original shinobi characters created specifically for this fanfiction. His Hogwarts professors could also play important roles, perhaps being involved in the shinobi training or having some sort of connection to the shinobi world. And of course, if there are any antagonists, they could be from either the wizarding or the shinobi side, or a combination of both, making for some really interesting conflicts.
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.