His friendships might also be affected. Some friends might be more supportive and visit him often during his recovery, while others who were more into the fast - paced action life might start to drift away. They might not know how to handle Brian being injured and not as active as before. Also, new friendships could form with people he meets during his recovery, like a physical therapist who could introduce him to a different world outside of racing.
Maybe Brian gets injured in a fight with a rival racing gang. His injury is serious enough that he has to reevaluate his life in the racing underworld. This could lead to him trying to find a more legal and less dangerous way to be involved with cars, like starting a mechanic shop with the help of his friends. Meanwhile, his enemies might think he's out of the game and start making moves that put his friends in danger.
His relationship with Sasuke could become more complex. Sasuke might be both envious of Naruto's new power and also worried about Naruto losing his humanity in the dragon form. Sakura could be initially scared but then determined to help Naruto control his form, which would strengthen their friendship. His relationship with Kakashi would change as Kakashi would now have to mentor Naruto in a different way, guiding him to use his dragon powers for good and not let them consume him.
Naruto's relationship with the villagers would also change. Some might be afraid of his new power, seeing it as something strange and unknown. This could lead to some isolation for Naruto at first. However, those who truly trust him, like Iruka, would be there to support him. His interactions with the other ninja villages might also be affected. They could see Naruto as an even greater threat or, conversely, as a potential ally with this new and powerful ability.
Well, with the gods, they would be extremely wary of Percy. They would constantly be watching him, fearing that he might inherit Typhon's destructive nature. His relationship with Chiron would be complex. Chiron would try to mentor him, but also keep a close eye on him. As for his relationship with his enemies, they might be more afraid of him, but also more eager to take him down because of his powerful lineage.
His relationship with Bucky would be severely strained. Bucky might not believe that Cap is truly brainwashed at first and try to reach out to him, but Cap could see Bucky as a threat. With Tony Stark, there would be more conflict. Since they already had their differences, a brainwashed Cap could be much more aggressive towards Tony. And his relationship with Natasha would also change. She might be the first to suspect the brainwashing and try to find a way to save him, but Cap would be suspicious of her motives.
His relationship with Sakura would definitely be affected. Sakura, who has always known the warm - hearted Naruto, would be shocked and confused. She might try to reach out to him at first, but if he keeps pushing her away, she could become frustrated or even give up. Their friendship would be strained.
His relationship with Sasuke would be very different. Sasuke might be more protective of Naruto as a little girl. He may not see her as the same rival he once did and instead feel a need to safeguard her.
For his male friends like Shikamaru and Choji, they might initially be a bit awkward around Naruto. But as time passes, they would adapt and might start to treat him more like one of the girls in their group. Naruto's relationship with the older male ninjas like Jiraiya could also change drastically. Jiraiya might not be able to train Naruto in the same way as before and might have to come up with new training methods that are more suitable for Naruto's new form. Naruto's friendships with female characters like Ino could also transform. Ino might take Naruto under her wing and teach him things like how to do proper makeup or how to style his hair in the ninja world.
Harry's relationship with Lupin would be very interesting. Lupin, being a werewolf himself, could act as a mentor to Harry. He could teach Harry how to control his werewolf side better. And this shared experience could bring them closer together. But at the same time, Harry might feel a sense of resentment towards Lupin, thinking that Lupin could have prevented his transformation in some way.
His relationship with Annabeth would be really different. She would have to adjust to this new form of Percy. At first, she might be a bit scared or unsure, but then she would start to see the advantages of his dragon form and work with him. For example, she could use his ability to fly to reach places faster.