I think Michael Corvin could be an interesting crossover character. He's a hybrid in the Underworld series, which means he has a unique set of abilities. In the Harry Potter world, he could be seen as a strange new kind of magical being. He might be able to help the wizards understand different types of magic that are more physical and instinct - based like his own. Also, his journey of self - discovery in the Underworld could be paralleled in the wizarding world as he tries to find his place among the wizards and witches.
Raze could be an interesting character to cross over. He's a lycan, and his brute strength and loyalty to his pack could be an interesting contrast to the more civilized and rule - based wizarding world. He could cause some chaos in Hogwarts with his wild nature, but at the same time, he might find some kind of kinship with the more rebellious students. His presence could also make the wizards re - evaluate their views on non - human magical creatures.
In a crossover, the underworld could have its own form of magic that is different from the magic in the wizarding world. Ron could be the one to first discover a connection between the two magics. He might find an old artifact in the wizarding world that has a link to the underworld. This could lead to an adventure where the trio explores the underworld to prevent a dark magic from the underworld from spreading into the wizarding world.
One idea could be that the characters from the Underworld series find their way into the wizarding world. For example, Selene could end up at Hogwarts. Maybe she's on a hunt for a new type of vampire that has taken refuge among the students. The wizards would be both intrigued and a bit scared of her skills and her lycan - slaying abilities. Another idea is that the magic from the Harry Potter world could be used to try and solve some of the problems in the Underworld, like the eternal war between vampires and lycans. What if Dumbledore tried to broker peace between the two factions using his wisdom and powerful magic?
They can interact through magical means. For instance, Harry could use a translation spell to communicate with underworld spirits. The characters might also use magical objects as a form of currency or bargaining chip. Like, a powerful wizarding wand could be highly sought - after in the underworld.
Another way it could work is through a character's quest. Let's say a character in the Harry Potter world is searching for a way to defeat a new kind of dark magic that has some similarities to the dark forces in Selene's world. They travel to find Selene, and together they combine their knowledge and skills. Selene's knowledge of the underworld's dark secrets and Harry's understanding of magic could create a unique way to fight this new threat.
A great 'Harry Potter' underworld don fanfiction might explore the idea of the don being a Muggle - born who was shunned by the wizarding world and thus turned to the underworld. But he still has a good heart and uses his underworld influence to help Harry and his friends. He could provide them with safe houses in the Muggle world that are magically protected, using a combination of his Muggle knowledge and the little magic he has learned on his own.
Sure. Some fanfiction might focus on an elder vampire character who has a long history and how they might view the events in the Harry Potter world. They could be a neutral party, or perhaps they have their own motives for getting involved. Another aspect could be the underworld aspect. It could be a hidden part of the wizarding world that is rarely explored in the original series, filled with all sorts of dark and mysterious creatures, and in fanfiction, it could be expanded upon with vampires being a major part of that underworld society.
Yes, there are likely some out there. Fans often create crossover fanfics that combine different universes like 'Hitman' and 'Harry Potter'. These can be really interesting as they blend the magic and mystery of 'Harry Potter' with the stealth and assassin - like nature of 'Hitman'.
If Loki were to enter the Harry Potter world, it could significantly disrupt the plot. His ability to deceive and manipulate could lead to many characters making wrong decisions. For instance, he could trick Dumbledore into believing a false prophecy, which would send Harry and his friends on a wild goose chase.
I think Harry Potter himself would be very interesting. Imagine him in the world of Twilight, with his Gryffindor courage facing the dangerous vampires and werewolves. His magical skills could give him an edge in this new and strange world, and he might also learn some things from the Twilight characters about their different kind of 'power' which is more physical and instinct - based.
It could be Aquaman. He is so different from the wizards in the Harry Potter universe. His fish - like abilities and his role as a king would make for some great interactions with the Hogwarts students and professors. He could teach them about the ocean and its secrets, while also being amazed by the magic of wands and potions.