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 that would interact with Harry Potter in this fanfiction would be Sam and Dean Winchester. Sam, with his intelligence and research skills, could help Harry understand more about the supernatural world from a Winchester perspective. Dean, on the other hand, would teach Harry how to be a tough fighter. Castiel would be another key character. His angelic powers and his relationship with the Winchesters would bring a new dynamic to Harry's life. There could also be characters like Charlie, who could bond with Harry over their shared sense of adventure and perhaps introduce him to new aspects of the Winchester world like their use of technology in hunting.
Well, Sam and Dean Winchester are the obvious ones. They are the core of the Winchester family and would play a major role in Harry's life if he was raised as a Winchester. Castiel would also be important. He could offer a different perspective to Harry, being an angel. And don't forget about Crowley. He might see Harry as an interesting new player in the supernatural world and try to manipulate him or form an alliance. There could also be other hunters that the Winchesters know who would interact with Harry.
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.
One possible main character could be a Martian elder who takes Harry Potter under their wing and helps raise him. This Martian elder could have special knowledge about the planet and its hidden magic that they pass on to Harry.
Most likely, Harry Potter would be one of the main characters as the title implies he is the one being saved. And characters from the Winchester side, perhaps Sam and Dean Winchester. They are the main protagonists in the Winchester universe and would be the ones doing the saving in this fanfiction.
Obviously, Harry Potter himself would be the central character. But there could be a mafia boss who takes him in, maybe someone with a lot of power in the wizarding underworld. And there might be some henchmen characters who act as Harry's guardians or trainers in this new, dark world.
In this fanfiction, Harry is the main character for sure. There could be a trapeze artist who is secretly a witch or wizard from another land and helps Harry discover more about his own powers. And the circus's animal trainer, who has a special bond with the magical animals in the circus, could also play an important role in Harry's life, teaching him about the connection between magic and the natural world of the circus animals.
Obviously, Harry would be the main character. But there could be new characters like a Russian wizard mentor who teaches Harry about the unique Russian magic. Another could be a young Russian witch who becomes Harry's best friend and helps him adapt to the Russian wizarding world.
For sure, Harry Potter is the main one. But in this fanfiction, there could be a local hermit who is actually a powerful wizard in disguise. He sees the potential in Harry and decides to train him in a different form of magic. Then there are Harry's pet animals on the farm. A magical dog, perhaps, that can sense danger and protect Harry. And there could be a young girl from the neighboring farm who becomes Harry's best friend and is the first to discover his magic, and together they embark on adventures around the farm and in the wizarding world.
Obviously, Harry Potter himself would be the main character. But there could be new characters like his Chinese friends. For example, a girl named Mei who is an expert in Chinese calligraphy magic.
Harry Potter is the main focus, of course. But the dragon would play a crucial role. It could be a dragon with a special backstory, like it was once a guardian of some great magic and now it passes that knowledge on to Harry. Other characters could include some of Harry's friends from Hogwarts. They might be initially scared of Harry because of his dragon - like behavior but later come to understand him. And there could be some villains from the original story who try to take advantage of Harry's unique situation.
One possibility is that Harry would grow up with a very different set of skills. Jason Winchester is often associated with hunting and survival skills. So Harry might be trained in those areas instead of magic at first. He could be more physically adept and have a more hands - on approach to dealing with threats. For example, instead of using a wand to fight off dark wizards, he might use a weapon like a knife or a gun as Jason Winchester would. Also, his view of the world could be shaped by Jason's more gritty and down - to - earth perspective, rather than the magical world view he has in the original Harry Potter series.