His relationship with his friends would be severely strained. They would be shocked and disappointed in his new, dark ways. Tadashi's friends, who had become Hiro's friends too, would try to bring him back to the light, but Hiro might push them away. For instance, GoGo might be the most vocal in her opposition to Hiro's actions, leading to heated arguments between them.
If we consider his relationship with other characters in the Big Hero 6 universe, like the villains or potential new allies in his dark phase, he would form very different bonds. He might team up with a villain who offers him the resources to pursue his new, dark goals. This would put him at odds with his former friends and allies, and he would be seen as a traitor by those who once knew him as a hero.
If Hiro was kidnapped in a Big Hero 6 fanfiction, the emotional aspect of the story would be amped up. His friends would be filled with worry and determination. They'd have to dig deep within themselves to find new ways to use their powers. For example, GoGo might have to push her speed limits even further. And Baymax would be constantly updating his search algorithms. The story would be filled with tension as they race against time to save Hiro.
His relationships would change drastically. His friends who practice regular magic would likely be very concerned and try to persuade him to stop. They might see him as a threat to their way of life and the safety of the magical community. His family, if he has any in the story, would be heartbroken. They might try to stage an intervention to bring him back from the dark side. And his relationship with his former mentors would be severed. They would feel that they failed in teaching him the right values.
His relationship with himself would also change drastically. He would have to grapple with his new identity as a dark side user. There would be inner turmoil as he might still have some remnants of his former self. He could struggle with the moral implications of his actions and the new powers he has. This internal conflict could also affect how he interacts with others, making him more unpredictable and volatile in his relationships.
Another idea is that Hiro is influenced by a dark force or a villain who convinces him that the world needs to be 'fixed' in a more extreme way. He might then create dangerous and unregulated technology that starts to cause chaos in San Fransokyo. He could see himself as a sort of anti - hero, believing his actions are for the greater good when in reality they are causing harm.
His friends would be very cautious at first. For example, Sasuke might be more on guard, seeing Naruto as a potential threat. However, true friends like Shikamaru might try to understand what's going on and find a way to help Naruto control his new powers.
His relationship with Bakugo would likely change significantly. Bakugo might initially be jealous of Izuku's unique shadow quirk. But over time, they could develop a more competitive but respectful relationship, as Izuku's shadow quirk gives him new ways to fight. With his friends like Uraraka, Izuku's new quirk could make him seem a bit more mysterious. Uraraka might be curious about how his quirk works and they could bond over her trying to understand it.
It would probably change the dynamic between them significantly. They would no longer be just friends or colleagues in the fight against evil. It would add a romantic sub - plot that could either strengthen their team - up or create some tension if they try to hide it from the others. For example, they might be more distracted during battles because they're thinking about each other.
If Naruto were not human, his relationships would likely be very different. For example, his relationship with Sasuke might be more strained. Sasuke, who is very focused on power and revenge, might see Naruto as a greater threat if he's not human. He could view Naruto's non - human abilities as something to envy or fear. With Sakura, she might be more hesitant around Naruto. Instead of her initial crush, she could be more cautious, not knowing what Naruto is truly capable of.
With Sakura, she might be initially afraid of Naruto's demon form. But as she realizes that Naruto is still the same person inside, she could become more protective of him and help him control his powers. Their friendship could deepen in a different way compared to the original story.
His relationship with Obi - Wan would have been much more positive. There would be no betrayal, and they could have continued to be master and apprentice, or perhaps even equals as they both grew in the Force. With the Jedi Order intact, they could have worked together on many important missions. Anakin would also have a different relationship with Yoda. He would be seen as a more stable and reliable Jedi, and Yoda might have given him more responsibilities within the Order.