At Hogwarts, if Harry was born a vampire, his classes would be affected. In Potions, he might be interested in different ingredients that could help him control his vampiric nature or enhance his powers. In Defense Against the Dark Arts, he could bring a unique perspective as he himself is a 'dark' creature in the eyes of some. His social life would be in turmoil. While some students might be intrigued by him, most would likely keep their distance. He would also have to find a way to avoid detection by the wizarding authorities who might not be too keen on having a vampire in the school. His dormitory situation would be tricky too. Sleeping in a room full of students could be dangerous for them and uncomfortable for him as he might be tempted by their blood.
If Harry Potter were born a vampire in fanfiction and at Hogwarts, he would face many challenges. Firstly, he would not be able to participate in some daytime activities like Quidditch matches as easily because of the sun. Secondly, the professors would have to deal with his unique situation. Some might be more accepting, while others could be very wary. His relationships with his classmates would be strained as well. The Gryffindor common room might not be as safe for him if some students were afraid of him. He would have to constantly control his vampire instincts, which could be difficult in a place full of tempting warm - blooded students.
His diet at Hogwarts would be a major change. Instead of eating normal food, he would need blood. He might have to find some discreet way to get it. His sleeping habits could also be different. And he would probably be the center of a lot of rumors and fear among the students.
He'd likely have to keep his vampire identity a secret. He might not be able to participate in some daytime activities or classes that take place outdoors during the day. His diet would be a huge issue, having to find a way to get blood without being discovered.
His classes would be a struggle. For example, in Potions, the smell of the ingredients might be overwhelming to his new vampire senses. And in Defense Against the Dark Arts, he might have a new perspective on dark creatures since he is now one of them.
His relationships would likely be very different. For one, he might be more of an outsider. The other students grew up in the wizarding world in a more common way, while Harry was raised by the Flamels. He could be seen as having an unfair advantage in terms of magic knowledge. But on the other hand, he might also be respected more for his unique upbringing.
In terms of his classes, Defense Against the Dark Arts would be a whole new experience. He could use his Saiyan powers to counter dark magic in ways that no one has ever seen before. He might even develop his own unique spells that are a blend of magic and Saiyan energy, making him a truly formidable wizard - Saiyan hybrid at Hogwarts.
He'd be more in touch with nature. His magic could be centered around life - based spells.
His life would be much quieter. No more noisy Gryffindor common room or bustling Diagon Alley. He could enjoy the peace of nature, listening to the wind in the trees and the calls of magical birds.
His life would be very different. For one, he'd have to deal with the extreme cold. Magic would be used in different ways, like creating warm shelters or finding food in the harsh winter. Also, he'd be far from his friends in Hogwarts, so he'd have to make new friends, maybe among the local magical folk or other outcasts who live in Alaska.
He'd be more technologically inclined. Since Wakanda is known for its advanced technology, Harry might integrate magic with tech more often. For instance, he could use Wakandan communication devices enhanced with magic for long - distance spells.
If Harry had diabetes in fanfiction, his social life might change. He might be more cautious about going on long outings with friends. For example, when they plan a trip to Hogsmeade, he has to make sure he has everything he needs. Also, his confidence could be affected. He might worry about being a burden to his friends during dangerous situations like facing Death Eaters, because his diabetes could potentially slow them down. And his relationships with teachers might become more complex as they try to accommodate his condition while still maintaining the standards of Hogwarts.
His life would be completely different. He'd be part of a vampire society instead of the wizarding one. He'd have to adapt to their nocturnal lifestyle.