Well, his crewmates might be a bit more protective of him at first. They're used to Luffy being a tough guy, but now he looks like a girl. Zoro might be a bit more hesitant to let him get into fights right away. Nami could be more motherly, trying to make sure he's dressed appropriately. Usopp might crack more jokes about Luffy's new look. Sanji, on the other hand, would probably be over the moon and constantly trying to cook special things for 'her'.
His relationship with Voldemort could change significantly. Voldemort might not immediately perceive Harry as a threat if he looks like a girl. He has a certain image of the boy who will be his downfall, and a girl - like Harry would disrupt that. This could give Harry an opportunity to get closer to Voldemort, perhaps infiltrate his ranks in a way that he couldn't as a boy.
His friends might be initially confused. They're used to seeing Harry's face clearly, so a mask could create a sense of distance. Hermione, for example, would probably be very curious and try to find out the reason behind it right away. Ron, on the other hand, might be more laid - back at first but would also start to worry if Harry didn't explain soon.
It might make his crew members view him in a new light. They could be in awe of his new dragon - like powers and be more protective of him as they know he has a very powerful and perhaps more dangerous ability now. For example, Nami might be more cautious about Luffy getting into fights as his dragon powers could attract more powerful enemies.
Well, in such fanfictions, Naruto's character development can take a whole new turn. He might become more in touch with his emotions as if having to adapt to a more 'feminine' role. For example, he could be more empathetic and less brash. This is because the female stereotype in many stories is often associated with being more in tune with feelings. He may also face different types of challenges, like dealing with the expectations that come with being treated as a girl in the ninja world, which could be vastly different from his original male - centered challenges.
His friends might be more protective of him. For example, Hermione would constantly be on the lookout for any signs of discomfort or danger for Harry. Ron would probably offer to carry things for him more often.
Well, his relationship with his sensei, Iruka, could be interesting. Iruka has always seen Naruto as his own special student. But with Naruto looking like Kakashi, Iruka might start to treat him a bit differently. He might expect more strategic thinking from Naruto, like he does from Kakashi. Naruto's friends in the village, like Choji and Shikamaru, might initially be shocked. Shikamaru, who is used to Naruto's impulsive nature, might be thrown off by this new Kakashi - like Naruto. He might have to re - evaluate how he interacts with Naruto, and they might need some time to get back to their normal dynamic. As for Naruto's relationship with the Hokage, the Hokage might see this as an opportunity to give Naruto more complex and dangerous missions, thinking he has some of Kakashi's abilities now.
Well, Naruto has his own unique style, so dressing like Tobirama would make him look more solemn. Tobirama's style is more traditional and reserved. Naruto might look less of his boisterous self with Tobirama - like robes and maybe a different hair - style to match. His bright orange jumpsuit would be replaced by something more in line with Tobirama's era, like dark - colored robes perhaps. It would be a big change from his usual look.
Zoro often puts himself between Luffy and danger. For example, when facing strong opponents, he'll be the first to step forward and engage, making sure Luffy is safe behind him.
If Luffy has a Zanpakuto in fanfiction, it could change his character development a great deal. Firstly, he'd have to adapt to a new type of power source. The Zanpakuto's power might be very different from his Devil Fruit power. He may become more cautious as he learns about the Zanpakuto's capabilities and how to control it. Secondly, his relationships with his crew could change. They might be curious about this new weapon and how it affects Luffy. This could lead to new interactions and discussions within the crew. And finally, in terms of his enemies, they would see him in a new light. They would need to strategize differently against a Luffy with a Zanpakuto, and this could also impact how Luffy views himself and his role as a pirate.
His relationships would become very different. Since Naruto is usually so friendly and outgoing, this coldness would be a shock. His friends like Shikamaru, who respects Naruto's normal nature, would be put off. They might think he's going through something really bad, but his lack of communication due to the coldness would make it hard for them to offer help. As a result, his friendships could start to crumble.