Well, it could be that Harry discovers some ancient magic that transforms him into a god - like figure. He might gain powers like super strength, the ability to control the elements, and the power to see into the future. Maybe he uses these powers to protect the wizarding world from a new, even greater threat than Voldemort.
If Harry Potter becomes god in fanfiction, he might completely reshape the magical world. He could rewrite the laws of magic, perhaps making it more accessible and less dangerous. He could also bestow extraordinary gifts upon his friends. Hermione might gain the ability to instantly understand and master any spell or bit of knowledge, and Ron could become an unbeatable warrior with superhuman strength in the face of any danger.
Perhaps the very magic that made Harry a god has a sort of negative side - effect. This could manifest as a shadowy entity within Harry that tries to take over his mind and use his powers for evil. So, in a way, this internal struggle could be the main antagonist in the story.
Well, in such a fanfiction, Harry might gain incredible powers of destruction. He could start to reshape the magical world according to his newfound, perhaps more radical, ideas. Maybe he would use his powers to destroy dark magic at its roots, but also accidentally cause some chaos in the process as he's still learning to control this new god - like power.
He could have ultimate power to change the wizarding world completely. For example, he could end all forms of dark magic forever and bring eternal peace. He might also be able to resurrect those who died in the fight against Voldemort.
Hermione could be one of his allies. She's always been by Harry's side and with her intelligence, she could help Harry understand and control his new powers. Also, some of the outcast wizards and witches, like the werewolves or half - bloods who have been marginalized in the wizarding world, might see Harry as their champion and ally with him.
Well, he might gain incredible powers like the Greek gods. He could control the elements, for example, just like Zeus controls lightning. Maybe he'd also have a new look, with a more god - like appearance. And his relationships would change too. His friends might view him differently, with a mix of awe and perhaps a bit of fear.
Well, he could probably change a lot of things. He might go back in time and prevent some of the tragedies that happened in the original story, like the death of his parents. As a god, he would have incredible powers, so he could easily defeat Voldemort much earlier and save a lot of lives. Maybe he would also use his newfound god - like status to bring about a more just and equal wizarding world.
The story could develop with Harry using his god - like powers to explore other dimensions. He might visit the afterlife and bring back important figures from the wizarding history to teach the present - day wizards. For instance, he could bring back Merlin to give lectures at Hogwarts.
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.