In this fanfic, it could be that the Acrobleno is a secret magical realm known only to a few. Harry is sent there perhaps as part of a test or a plot by some dark forces. Once there, he teams up with some local wizards or magical beings. They teach him their special brand of magic, which he then uses to fight against the forces that sent him there in the first place.
Well, maybe Harry is sent to the Acrobleno by mistake. He could find himself in a strange new magical place filled with unique creatures and magic that he's never seen before. He might have to learn new spells and ways to survive there, all while trying to find a way back to Hogwarts.
The plot could involve Harry being sent to the Acrobleno due to a malfunctioning of a new magical transportation device. At the Acrobleno, he discovers an ancient prophecy that is somehow related to his destiny at Hogwarts. He has to decipher the prophecy and along the way, he meets different characters. Some are friendly and help him, while others try to stop him from fulfilling the prophecy. He has to use his Gryffindor courage and his knowledge of magic to overcome the obstacles.
Perhaps it's a dark spirit that has been trapped in the Acrobleno for centuries. When Harry arrives, it senses his power and wants to possess him or use his magic for its own evil purposes. So it becomes the main antagonist, constantly trying to harm Harry and stop him from leaving.
Well, it could be that Harry is sent to a future time in 2110 for a top - secret mission. Maybe he has to deal with some advanced technology that he doesn't understand at first. He might encounter new forms of magic or threats that are unique to that time period.
The plot might involve the Justice League finding a way to incorporate magic into their understanding of the world because of Harry. For example, the Flash could be curious about how Harry can apparate and might try to find a scientific explanation for it. Aquaman could teach Harry about different forms of communication, as he has his own unique way of communicating underwater. As Harry grows, he might use the Justice League's resources to fight against the Death Eaters. He could bring some of the League's technology into the wizarding world, which would change the dynamics of the fight against Voldemort.
Another plot twist could be related to Harry's identity. Since he's adopted by Regina, his connection to the Dursleys and his original family history could be distorted. This might lead to a situation where he discovers his true heritage in a completely different way than in the original 'Harry Potter' series, perhaps with Regina being involved in the discovery in a complex way.
Perhaps the biggest plot twist would be Harry's view of the Death Eaters. Growing up with the knowledge that his mother was Bellatrix, he might have a more sympathetic view of some of them at first. He could believe that they were misled rather than inherently evil. This would lead him on a journey to try and reform some of the Death Eaters, which would put him at odds with both the Order and the remaining Death Eaters who don't want to change. It would also change the way we see the divide between good and evil in the wizarding world.
One possible plot could be Harry growing up believing he is on the right side by following Bellatrix and the Death Eaters. But then he discovers some secrets about his real parents and starts to question everything he's been taught. This leads to an internal struggle as he tries to decide whether to stay with Bellatrix or break away and find his true identity.
Well, one major plot change could be his relationship with magic. In Canada, the magical community might have different traditions. Maybe the way magic is taught in Canadian wizarding schools is more nature - based compared to Hogwarts. So Harry would grow up with a different understanding of magic.
Well, it could be that Harry Potter uses his magic skills like the Patronus charm against Thor's lightning. Maybe Thor mistakes Harry's magic for some new Asgardian sorcery at first. And then they start to fight over some misunderstanding, like a magical artifact that Thor thinks is from Asgard but Harry knows is important for the wizarding world.
Well, perhaps there's a magical portal that connects the Ghostbusters' New York City to Hogwarts. And some mischievous Hogwarts ghosts accidentally pass through it and start causing chaos in NYC. The Ghostbusters, not knowing anything about magic at first, have to team up with Harry Potter and his friends who come to NYC through the portal to figure out how to send the ghosts back. They learn from each other's worlds in the process.
Well, one possible plot could be that they meet during a time when the wizarding world is facing a new threat. Harry, being the hero he is, is in the thick of things. Daphne, perhaps having changed from her Slytherin ways a bit, starts to see Harry in a new light. They team up to fight the threat, and along the way, their relationship blossoms into love. Eventually, they get married and work towards a more united wizarding world, where Slytherin and Gryffindor ideals are combined to make it a better place.