I'm not entirely sure as it's a rather strange and unique concept. It might be a fan - made story where the world of Harry Potter is somehow merged with the Vulcan race from Star Trek. Maybe it involves a character in the Harry Potter universe having some Vulcan - like traits or abilities.
It could have been inspired by the popularity of crossover fanfictions in general. Fans often like to mix different fictional worlds to create something new and exciting. So, a fan might have thought about the logical Vulcans and the magical Harry Potter world and decided to blend them by making a character half - Vulcan in the Potter universe. This way, they can explore new storylines and character developments that wouldn't be possible within the original universes alone.
There might be some original characters created in the fanfiction that combine the traits of both universes. For example, a half - Vulcan, half - wizard character could be popular. This character might struggle with balancing the emotional and magical side of their wizard heritage with the logical Vulcan side.
One interesting Harry Potter Vulcan fanfiction could be a story where the logical thinking of Vulcans is introduced to the magical world of Harry Potter. For example, a Vulcan character might help Hermione with her studies in a more methodical way. Another could be a plot where the stoicism of Vulcans clashes or blends with the passionate nature of the Hogwarts students.
I'm not sure it's a very recognized concept. Harry Potter is from its own magical world, and Vulcan is from Star Trek. They are from different fictional universes. Fanfiction usually combines elements within the same or related universes more often.
It could be really interesting. Maybe Naruto would have some Vulcan - like traits such as extreme logic in some situations while still retaining his ninja impulsiveness. For example, in battle, he might use his Vulcan - style logic to analyze his opponents' moves more precisely, but then rely on his ninja skills and chakra when it comes to actual combat.
I'm not entirely sure if there is a specific 'Harry Potter is half demon' fanfiction, but considering the limitless creativity in the fanfiction community, it's very likely. Writers might be inspired to create such a story to explore the contrast between the magical world of Harry Potter and the more dark and otherworldly concept of being half - demon. They could use it to examine themes like acceptance, identity, and power in a whole new light.
The allure of 'Harry Potter' half - elf fanfiction lies in the mystery it can bring. Half - elves are not part of the original lore in a big way, so writers can be very creative. For example, they could create a half - elf character who has a secret power that helps Harry in his fight against Voldemort.
In some fanfictions, it could be an original character created by the author. Maybe a witch who was the result of an affair that his father had before he married his mother. However, this is completely against the canon of the original books, but in the world of fanfiction, anything is possible.
It would be extremely difficult. Harry Potter characters use magic wands and spells, while Vulcans are known for their logic and mind - melds. Maybe if there was some sort of magical - technological accident that merged the two universes, but it would be a stretch.