In a fanfiction, the characters from Stranger Things could have different roles. The Byers family might have a hidden magical heritage that was dormant until the events of Stranger Things. Jonathan could be a talented wizard photographer, using magic to enhance his pictures and capture magical creatures. Nancy could be a fearless journalist in the wizarding world, uncovering secrets about the connection between the Upside Down and certain dark magic. The kids would be sorted into different houses based on their personalities. Eleven might be in Ravenclaw for her intelligence and unique powers, while the boys could be in Gryffindor for their bravery in facing the Upside Down.
The Stranger Things characters would bring their own unique personalities and skills. For example, Joyce could be like a Muggle mother figure who somehow gets involved in the wizarding world and helps out with her no - nonsense attitude. Hopper could be an Auror - like figure, using his investigative skills to track down dark wizards or creatures that have a connection to the Upside Down. The kids would have to adapt to the rules of Hogwarts, but also introduce their own ideas. They might not be used to using wands, but they could find ways to incorporate their own abilities with magic, like using Eleven's powers to enhance a spell or something.
The Hogwarts professors could also play important roles. Dumbledore could be seen as a wise old figure, much like Rafiki. He could offer guidance to the animals and the Harry Potter characters alike. Snape, on the other hand, might be a bit more difficult to place, but perhaps he could be a sort of protector in the shadows, using his potions knowledge to help heal any injured animals or deal with magical threats in the Pride Lands.
Neville Longbottom could befriend Mia in fanfiction. Neville, with his new - found confidence in the later Harry Potter books, could teach Mia about being brave and standing up for herself. He could also share his knowledge of plants, and they could start a garden together in the Genovian palace grounds. This would not only be a cute friendship but also a way to blend the two different worlds of the two series.
Angel Dust would be a bit of a wild card. His flamboyant personality and his own set of skills (like his combat abilities) could get him into all sorts of trouble and also some interesting situations. He might befriend the Weasley twins, getting involved in their pranks but also teaching them a thing or two about his own brand of chaos. Husk, on the other hand, would likely just try to find a quiet corner in the Hogwarts library or the Three Broomsticks and avoid most of the hubbub, but would be dragged into things against his will from time to time.
Well, consider this. The Upside Down in Stranger Things could be a result of some dark magic from the Marvel universe. The Stranger Things characters, being the only ones who know about it, are recruited by Doctor Strange. Eleven could be trained by Strange to better control her powers and use them in a more magical way. The other kids could learn about different dimensions from Strange and use that knowledge to help protect the Marvel universe from threats that might be coming from the Upside Down.
Harry could be seen as a strange but powerful being. His Gryffindor courage would be respected in Asgard. Hermione might be seen as a great scholar, like the Asgardian mages. Ron could be the loyal friend who has to adapt to the grandeur of Asgard.
Harry Potter himself could be seen as a kind of foreign wizard in the RWBY world. He might be initially confused by the concept of Dust but quickly adapt and use his magic to enhance the RWBY team's capabilities. Hermione would probably be fascinated by the study of Dust and Semblances, and use her vast knowledge to help bridge the gap between the two magic systems. Ron could be the one who forms quick friendships with the RWBY characters, sharing his sense of humor and loyalty.
The characters from 'Shameless' are known for their scrappy and street - smart nature. In the 'Harry Potter' world, they could be Muggles who accidentally discover the wizarding world. For example, Carl could be exploring an old abandoned building and find a hidden passage to Diagon Alley. Or they could be Squibs related to some important wizarding families. Like Veronica could be a Squib who has always felt out of place in the Muggle world and finally finds a sense of belonging in the wizarding world's fringes.
The Basilisk could be a fearsome weapon. A powerful lord might capture it and use it to strike fear into his enemies. Just like how dragons are used in Game of Thrones, the Basilisk could be a game - changer in battles.
The characters from Hotel Transylvania could be new students at Hogwarts. Dracula could be a teacher of some sort, perhaps teaching about dark creatures in a different way than Hagrid. His bat form could be mistaken for a dark omen by some students at first.
Well, he could be a foreign exchange student of sorts from a hidden land of ninjas. His skills would make him stand out immediately. He might befriend Harry and help him train in a different way of combat, using his Sharingan to analyze the weaknesses of their enemies like Death Eaters.