In a 'Harry Potter raised by Hel' fanfiction, Harry could have a very different social structure around him. Hel might surround him with beings from Norse mythology. He would learn different forms of magic, like rune magic perhaps. His relationship with Dumbledore would be non - existent or very different. He might not even attend Hogwarts. Instead, he could be trained in a place that combines the elements of the Norse underworld and magic. His character would likely be more brooding and less inclined to trust the 'light' side of the wizarding world as he was not influenced by the positive Hogwarts environment.
He'd likely be more attuned to the darker aspects of magic. Since the Hel Gods are associated with darker realms, Harry might not shy away from what's considered 'dark magic' as much as in the original story. He could be more of an outcast among the regular wizards who fear his different upbringing.
He'd be more reserved. Hel's influence would make him less likely to trust easily. He wouldn't have the same sunny disposition as he might have had if raised by the Dursleys and then influenced by Hogwarts. He'd be more attuned to the darker aspects of magic and life in general.
In Norse mythology, Hel is a figure associated with the underworld. In this fanfiction, she could be a character who has some sort of connection to the wizarding world. Maybe she's a powerful witch from a different magical realm that Harry encounters and eventually marries.
Perhaps in this fanfiction, the Hel Gods raise Harry to be a sort of mediator between the wizarding world and the underworld. So he has to deal with dark creatures in a different way than in the original story. He might have to make deals with them or understand their motives better. And his role in the fight against Voldemort could be completely different as he has this unique background.
Well, perhaps in this fanfiction, the reason for Harry being married to Hel is a magical prophecy. Their marriage could be a key to solving some greater threat. For example, Hel might have powers that are crucial in defeating a new dark force. And as they get married, they have to learn about each other's worlds and cultures, which would be a great source of conflict and growth.
In such a fanfiction, perhaps Wolverine's rough and protective nature would greatly influence Harry. Harry might grow up with a fierce sense of self - defense and loyalty. He could be trained in combat skills from a young age, making him a very different kind of wizard. Maybe he'd use his magic in more physical and aggressive ways compared to the traditional Hogwarts students.
In a 'Harry Potter raised in Ireland' fanfic, perhaps he'd grow up with a strong connection to Irish magic. He might learn unique spells only known in Ireland. Maybe he'd attend a local Irish wizarding school first before Hogwarts, and make friends with Irish magical creatures.
In a 'Harry Potter raised as a Warrior' fanfiction, the story could start with Harry being found by a group of Warriors. They teach him their code of honor and how to fight. As he grows up, he becomes an expert in their ways. When he enters Hogwarts, he stands out because of his unique combat - like approach to things. He might even form his own group of friends who are interested in his Warrior - style, and together they could face the challenges of the wizarding world in a different way compared to the original story. For example, instead of relying solely on spells, he might use his physical combat skills during duels.
In this fanfiction, the ghosts might protect Harry in a way that living people can't. They could give him advice based on their long years of observing Hogwarts. For example, they might tell him secrets about the founders of Hogwarts that help him in his adventures. Also, Harry's personality could be influenced by the ghosts' ethereal and somewhat detached nature, making him more introspective.
The plot could involve Harry growing up in a world where the boundaries between Greek and wizarding magic are blurred. Hecate could introduce him to magical creatures from Greek mythology. He might also have to face different kinds of dark forces that are more related to the ancient evils that Hecate has been fighting for centuries. This would make Harry a very different kind of wizard, one with a more diverse magical knowledge and power base.