When Harry Potter becomes a god in fanfiction, his relationships would experience a huge shift. His friends would look at him in a new light. Hermione might see him as a being to learn from, constantly asking him about the deeper secrets of magic. His relationship with the Hogwarts faculty would be more of an equal - to - equal among gods, if we consider them as powerful wizards. And his connection to the wizarding community as a whole would turn into a sort of benevolent guardian - like relationship, where they all look up to him for guidance and protection.
His relationships would change a great deal. With Hermione, he might become more of an equal in terms of physical capabilities. They could go on more dangerous adventures together without her constantly worrying about his safety. Ron might feel a bit left out at first, but then they'd all adapt. His enemies would be more afraid of him, and his friends would look at him in a new light, perhaps with a bit of awe and also some concern as his new abilities might make him a bit of a loose cannon.
His relationships with his friends would become more complex. They might be sad at first that he's a ghost, but also be comforted by his continued presence. For example, Hermione would probably still try to have intellectual discussions with him, even if he's in a different form.
Well, when Naruto becomes the Death God in fanfiction, his relationship with Sakura would change. She might be more hesitant around him, as his new power is so otherworldly. And his bond with Kakashi would also be different. Kakashi, being a wise ninja, would try to guide Naruto in using this power responsibly. Naruto's relationships with the villagers would shift too. Some might worship him, while others could be suspicious of his new - found power.
His relationships with his friends would become more complex. For example, Sasuke might be jealous or in awe of Naruto's new power. Sakura might see him as more of a distant figure, someone she can't fully understand anymore. And his old teachers like Kakashi would be in a position of having to respect Naruto's new status while still trying to guide him in some ways.
If Harry Potter becomes part of a Pokemon fanfiction, his life would change in many ways. Firstly, his daily routine would be different. Instead of going to magic classes, he'd be out in the wild looking for Pokemon. His friends might also change as he'd befriend other Pokemon trainers. His relationship with magic might even be affected. He could start using magic in new ways related to Pokemon, like using spells to communicate with them. And his sense of adventure would be redirected towards exploring the different regions in the Pokemon world.
He would become much more aggressive. Harry is usually a calm and strategic fighter, but as the Hulk, he would rely more on brute force and his first instinct would be to attack rather than think through a plan.
He might become more authoritative. Since he has the power of an emperor, he would need to make tough decisions and be more assertive in his commands.
He might become more stealthy and reserved. Instead of being as open as he was in the wizarding world, he'd have to be more secretive as a ninja.
His relationship with Kurama might become more complex. Since he's now also a kitsune - like being. They could either become more competitive or find a new way to cooperate. With his friends, some might be in awe of his new form, while others might be a bit scared at first. But Naruto's kind heart would eventually make them all accept him as before.
If Naruto becomes a nukenin, his relationship with the village elders would be completely severed. They would see him as a threat, and he would see them as unjust. With his peers, some might side with him, believing in his innocence. Others would follow the village's orders out of loyalty. His bond with the Nine - Tails would also change. The Nine - Tails might offer more support, seeing Naruto as an outcast like itself.