Perhaps a group of dark mummies could be the villains. These mummies were once Egyptian wizards who turned to the dark side and were cursed. They now roam the ancient tombs and want to spread their dark magic across both Ancient Egypt and the wizarding world that Harry comes from. They'd be a spooky and dangerous foe for Harry and his friends.
One possible main villain could be an Egyptian wizard who has been corrupted by dark magic. He might be after some powerful Egyptian artifact that can give him ultimate power. He could see Harry as a threat to his plans because Harry has knowledge of different kinds of magic from Hogwarts.
Another option is a sorceress who was once a high priestess but was banished for her evil deeds. She has been biding her time in the shadows of Ancient Egypt, and when Harry arrives, she sees an opportunity. She could try to use Harry's magic to break the spells that keep her in check. She would be a devious villain, using her knowledge of ancient Egyptian magic to try and outwit Harry at every turn.
There could be new villains like an evil wizard - scientist who wants to use magic to create black holes and destroy planets for his own gain. Or perhaps an alien race that has a natural ability to drain magic from wizards and witches and they see the Hogwarts students as a source of power.
The Death Eaters could also be major villains. They might team up with some anti - SHIELD groups in the muggle world. The Death Eaters' dark magic combined with the muggle - world weaponry of these groups could pose a serious threat to both the wizarding and muggle worlds that Harry and SHIELD have to stop.
It could be Death Eaters who have a new plan. They might want to create chaos in the Muggle world by targeting the Queen. They see her as a symbol of Muggle power and order, so by attacking her, they hope to disrupt the Muggle - wizard relationship.
He could meet an Egyptian wizard who is an expert in ancient magic. This wizard could teach Harry a great deal about the history of magic in Egypt.
It could be some of the remaining Death Eaters. They might target Amelia Bones because she is a powerful and important figure in the Ministry of Magic. Her knowledge and influence could be a threat to their plans of resurrecting Voldemort's ideology or causing more chaos in the wizarding world.
One common theme is the combination of different magics. The magic from the Harry Potter universe and the ancient Egyptian magic are often blended. For example, using spells from Hogwarts to unlock the secrets of ancient Egyptian tombs.
Well, it could be really exciting. Maybe Harry and his friends would discover ancient Egyptian magic that's different from what they know at Hogwarts. For example, spells related to the gods and goddesses of Egypt could play a big role. They might have to deal with Egyptian magical creatures too, like the Sphinx, but in a whole new setting that combines the world of Harry Potter with the ancient Egyptian landscape.
Perhaps a time - traveling agent sent from the future. Their mission could be to study the decline of ancient Egypt and try to find solutions to prevent it. This would make for an interesting story as they interact with the people of the past, from the slaves to the pharaohs, all while trying to fulfill their mission.
It could be some Death Eaters who have made a deal with a Wakandan traitor. They might want to steal Wakanda's vibranium to make powerful dark magic items. The Death Eaters' dark magic would pose a serious threat to Wakanda's peace and stability.
Well, perhaps Harry could be on a quest to find some ancient magic artifacts in Egypt that are related to Hogwarts' history. Maybe he discovers a hidden connection between Egyptian magic and the magic he's learned at school.