Well, Harry would be much more aloof and menacing. He might not interact with Hermione and Ron in a friendly way at all. Instead, he could view them as potential sacrifices or just insignificant beings. Hermione, being the intelligent one, might be terrified of Harry's newfound powers and strange upbringing. Ron would probably be outright hostile towards Harry, seeing him as a threat to the normal wizarding way of life.
In this fanfiction, Dumbledore would likely be on high alert regarding Harry. Their interactions would be filled with tension. Dumbledore would try to steer Harry away from the path of Cthulhu, but Harry, being raised by it, would resist. The other Hogwarts professors would also be cautious around Harry. For the students, they would either be in awe of Harry's dark power or completely avoid him. And as for the Death Eaters, they might initially see Harry as an ally due to his dark nature, but later realize that his goals are far more terrifying and otherworldly than their own.
The interactions in 'Harry Potter Raised by Cthulhu' fanfiction would be a complete departure from the original. Harry's upbringing by Cthulhu would make him see relationships in a very different light. He wouldn't value the same things as the normal Harry. For example, when it comes to the Weasley family, he might not be interested in their warm family dynamic. Instead, he could be looking for ways to use their connections for his own dark purposes. His interaction with magical creatures would also be different. He might not have the same respect for them and instead see them as tools or minions in his quest to spread Cthulhu's influence. The overall atmosphere in Hogwarts would be one of fear and unease because of Harry's presence.
The characters would have a different set of skills to show off. For instance, Harry could use his Yu Yu Hakusho - inspired powers to impress his friends. Ron might be a bit more envious and try to learn from Harry. Hermione would probably analyze how these new powers fit into the existing magical knowledge.
In this fanfiction, the interactions would be full of tension. Harry would be like a fish out of water in Arkham. The villains in Arkham, such as the Joker or Harley Quinn, could have very different reactions to Harry. The Joker might see him as a new plaything to toy with, while Harley Quinn might show some sympathy towards him. And Harry would have to constantly navigate these dangerous relationships while also trying to figure out his own identity in this strange new world.
Sam and Dean Winchester would interact with Harry like a big brother - type relationship. They would be protective of him, and teach him things. For example, Dean might show Harry how to use a gun while Sam could help him with research, both magical and non - magical. Harry would likely share his knowledge of magic with them, which would be fascinating for the Winchesters. He could also introduce them to his friends from Hogwarts like Hermione and Ron, and there would be some interesting cultural clashes between the hunter and wizarding cultures.
The interactions would be really fascinating. Harry could introduce his Hogwarts friends to things like the Ninja Way. Hermione would probably analyze it from a theoretical perspective, while Ron would be more interested in the practical side, like any new spells or skills. The teachers at Hogwarts would also have to adapt to Harry's different approach. For example, Snape might be even more critical at first, but as he sees the positive aspects of Harry's Naruto - influenced growth, he might change his view slightly.
Definitely Sam and Dean Winchester. They would be like his surrogate brothers or mentors. Then there's Castiel, the angel. He could have some interesting interactions with Harry, perhaps being intrigued by his magic. Bobby Singer could also be there, guiding Harry in the ways of hunting.
The main characters in 'Harry Potter raised by Winchesters' fanfiction would have some interesting interactions. Harry would surely have a lot of interaction with the Winchesters' enemies as well. Demons and other supernatural beings that the Winchesters fight would see Harry as a new target or a strange addition to the mix. In the wizarding world, Harry might interact with Snape in a more confrontational way, as his upbringing by the Winchesters could make him less patient with Snape's attitude. Also, new characters from the cross - over of the two universes could be created, and Harry would be at the center of those interactions.
Well, it would probably be a very strange and dark take on the Harry Potter story. Harry might grow up with a sense of the eldritch and the unknown. His magic could be influenced by Cthulhu's power, perhaps having a more chaotic and uncontrollable aspect to it. His values and view of the wizarding world would be very different from the original Harry, as he'd be raised in a cult - like environment centered around Cthulhu.
The younger Gallagher kids like Carl and Debbie would probably see Harry as a cool older brother figure with amazing powers. They'd constantly be asking him to do magic tricks for them. And Harry, having grown up without much of a family, would likely enjoy the attention and the sense of belonging in this big, chaotic family. Meanwhile, Frank might try to take advantage of Harry's magic for his own selfish reasons, which could lead to some interesting conflicts within the family.
He develops a more rebellious streak. In the original, Harry was quite respectful of authority in the wizarding world. But being raised by bikers, he might question rules more often. For example, he might not be as quick to follow Hogwarts' strict regulations.
In this fanfiction, Harry's development would deviate a lot from the original. His sense of right and wrong would be blurred. Since he's raised by devils, he may not have the same values as the normal Harry. He could be more self - centered, focused on his own survival and power gain rather than the well - being of others. His magical abilities might also develop in a more unorthodox way. Instead of learning the traditional spells for good, he might learn spells that are more harmful or controlling.