In such a fanfiction, Harry might start to study the lore of vampires. He could be intrigued by Dracula's power and mystery. Maybe he'd try to find similarities between the magic in his world and the dark allure of Dracula.
In such a fanfiction, Harry Potter might start to embrace the Dark Arts. He could abandon his friends at Hogwarts and join forces with Death Eaters. His actions would likely shock the wizarding world, and he would become a hunted figure by those who still oppose Voldemort and his followers.
If Harry was raised by Dracula in a fanfiction, his entire life would be a blend of two very different fictional universes. He would be accustomed to Dracula's nocturnal lifestyle, which could conflict with his Hogwarts schedule. His magic might be influenced by Dracula's vampiric nature. For example, he could develop spells that are related to blood or shadow magic. His relationships would also be affected. Instead of having friends like Ron and Hermione right away, he might be more solitary at first, having to learn how to interact with normal humans after being raised by a vampire.
If Harry Potter becomes the Joker in fanfiction, he would probably start to question all the values he once held. The Joker is all about subverting order, so Harry might begin to undermine the Ministry of Magic and other institutions. He could use his knowledge of magic to play cruel pranks on people, not the innocent kind of pranks he used to do. His Gryffindor courage could be twisted into a reckless disregard for the safety of others.
If Harry Potter becomes a Jedi, he would likely combine his existing magical skills with Jedi abilities. His Patronus charm could be enhanced by the Force, becoming an even more powerful protective entity. He might use his wand as a sort of lightsaber hilt, channeling the Force through it for unique combat moves. His ability to apparate could be refined with Jedi - like teleportation skills. Also, his knowledge of the wizarding world's dark magic could help him better understand the dark side of the Force and avoid its temptations.
If Harry Potter becomes a Lamia in fanfiction, his relationships would change drastically. His friends might be both intrigued and a bit scared at first. He would have to adapt to his new form and its characteristics. For example, he may need to learn how to control any new instincts that come with being a Lamia. Also, his role in the fight against Voldemort could be completely different. Instead of using a wand in the traditional way, he could use his Lamia - related powers to combat the dark forces.
If Harry Potter becomes a demon in fanfiction, his relationships would be severely affected. His friends like Ron and Hermione would be very confused and possibly afraid of him. They might try to find a way to reverse the transformation. And Hogwarts itself would be in chaos. The teachers would be divided on how to deal with him, some might want to help him while others might see him as a threat to the safety of the school.
Well, it would be a total chaos. He might use his magic skills to cause destruction. For example, he could turn Hogwarts into a dark fortress and rule over it with an iron fist. His friends would be shocked and probably try to stop him, leading to some really intense battles.
In such a fanfiction, Harry might gain enhanced physical abilities like super strength and speed. He could also have new magical powers related to his vampiric nature. For example, he might be able to hypnotize his enemies. His relationships with his friends would be severely tested. Hermione might try to find a way to reverse his vampirism while Ron could be initially afraid of him.
In this kind of fanfiction, Harry could potentially use the Hulk's strength to fight Voldemort in a very different way. He might be able to smash through dark magic barriers with ease, and his rage - like the Hulk's - could be a new source of power against the Death Eaters.
Imagine Harry Potter getting into creepypasta fanfiction. He could begin to incorporate some of the darker themes into his own view of magic. He might explore abandoned parts of Hogwarts that he thinks could be like the settings in creepypasta stories. His adventures could take a very different turn as he looks for signs of the uncanny and the terrifying within the familiar walls of the school. His perception of good and evil could also be distorted, as the lines are often blurred in creepypasta. This could lead to some really interesting, if not a bit disturbing, character development for Harry.