Well, Harry Potter for sure. He's the hero of the story, so when you're doing a crossover with a god, he's an obvious pick. People like to write about how he might use god - given powers to fight against Voldemort in new and exciting ways. Ron is also a character that shows up in these crossovers sometimes. He could be given some sort of special ability by a god, which might help him be more confident and useful in the group. And then there's Voldemort. Imagine him trying to either steal the power of a god or being in conflict with a god - like entity. It would make for a really intense story.
Harry Potter himself is very commonly paired with god - like entities. Since he is the main character, it makes sense that fanfiction writers would explore how his story changes when he has the influence or power of a god on his side. Hermione is also a popular choice. Her intelligence combined with god - like assistance could lead to all sorts of new magical discoveries. Another common character is Dumbledore. His already powerful and mysterious nature can be enhanced even more when paired with a god - like being, and it can add more depth to his backstory and actions.
They can interact through magical means. For instance, Harry could use a translation spell to communicate with underworld spirits. The characters might also use magical objects as a form of currency or bargaining chip. Like, a powerful wizarding wand could be highly sought - after in the underworld.
Luna Lovegood is also a common choice. Her eccentric nature and unique perspective on the wizarding world can attract Harry. In fanfiction, they might bond over their experiences with the strange and magical, like Luna's adventures with the Crumple - Horned Snorkacks and Harry's battles against Voldemort.
Another way of interaction could be through magical artifacts. Let's say there is an ancient artifact in the Harry Potter world that is a link to the Magic God. The characters might discover this artifact and accidentally or purposefully activate it. This would then draw the attention of the Magic God, and it could start to influence the events in the wizarding world, interacting with the characters through the power of the artifact.
Hermione is usually one of the main characters that interact with Harry. She might be in awe of his new powers at first but then help him use them wisely. Ron could also be there, perhaps being a bit more skeptical at the start but eventually coming around. Dumbledore might also play a role, guiding Harry even in his god - like state, sharing some of his own deep knowledge of magic.
Harry Potter and Nate Ford could be a likely pair. Harry's experience with facing great evils and his leadership skills combined with Nate's strategic mind in planning heists would make for an interesting dynamic. They could learn from each other's methods of problem - solving.
Hermione would likely be very curious about Kratos. She'd want to study his powers and the technology or magic from his world. Kratos, on the other hand, might be initially dismissive of her, but as he sees her intelligence and resourcefulness, he'd start to respect her. Harry would probably be in awe of Kratos' fighting skills and try to learn from him. And Kratos might see a bit of himself in Harry's determination to fight against evil.
No. The Harry Potter series mainly focuses on the wizarding world, magic, and battles against dark wizards like Voldemort. The idea of Harry being a 'god killer' is quite far - fetched from the original concept and not something that would be very common in the mainstream of Harry Potter fanfiction.
Harry Potter and Ichigo Kurosaki are very likely to be paired. They are both the main protagonists in their respective series. Harry has his strong sense of justice and magical powers, and Ichigo has his determination and Soul Reaper abilities. They could form a great partnership to fight against common enemies.
Stan can also be paired with Kenny. Stan's more moral - centered character can contrast with Kenny's somewhat nihilistic view of his own mortality. In a crossover with a post - apocalyptic world, Stan might be trying to find a way to save humanity while Kenny is just along for the ride, but still manages to survive in the most unexpected ways.
One interesting concept could be the combination of the magical world of Harry Potter with the omnipotence of a god - like figure. For example, how would Harry's struggle against Voldemort change if a god - like being intervened? Maybe the god could bestow new powers on Harry or his friends, or perhaps create new magical creatures that play a role in the battle. Another concept could be the exploration of different religious or mythological gods in the context of the Harry Potter universe. How would the presence of Zeus, for instance, impact the Hogwarts curriculum or the wizarding society's beliefs?