Obviously, Harry Potter would be the central character. But the Addams family members like Gomez and Morticia would play crucial roles as his new family. Wednesday Addams could be an interesting character in relation to Harry. She has her own dark and mysterious side, and she might either be a great friend or a bit of a rival to Harry in this new setting.
Another character that could be important is Sirius Black. If he finds out that Harry is being raised by the Addams family, he might have mixed feelings. He could be worried at first but then realize that Harry is in a unique and perhaps safer environment. His relationship with Harry in this fanfiction could be explored further, especially considering the differences between the wizarding world he knows and the Addams family's world.
If Harry Potter were raised by the Addams family in fanfiction, his style of dressing would be completely different. Instead of the traditional Hogwarts robes, he might be seen in something more gothic, like the Addams family's style. Also, his sense of humor would be darker. He'd probably find the pranks at Hogwarts a bit too tame compared to what the Addams family gets up to.
It would be really interesting. Harry would grow up in a very different atmosphere. Instead of the strict but loving environment at the Dursleys, he'd be in the spooky and unique Addams family setting. He might learn some very unusual magic from them, and his personality could be a blend of the Addams' eccentricity and his own Gryffindor courage.
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.
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.
Well, the Addams Family might be intrigued by Harry's magic wand. Morticia could compare it to one of Gomez's strange collectibles. Wednesday might see Harry as an interesting new addition to her rather dark world view. And the Dursleys? They would be terrified if the Addams Family ever showed up to check on Harry. It could be a really wild and wacky crossover with lots of unexpected interactions between the two very different fictional universes.