Perhaps they are very confused. Maybe they are not well - acquainted with either the 'Harry Potter' series or Greek mythology. They could be misinterpreting some minor similarities in themes like the idea of an underworld (although in 'Harry Potter' it's the Chamber of Secrets etc., not the same as Hades' domain) and wrongly assume a connection.
Somebody might think 'harry potter is hades fanfiction' if they are trying to create some sort of crossover in their own muddled - up imagination without really considering the fundamental differences between the two. Maybe they watched a lot of mash - up movies or read some really off - the - wall fan theories and got the wrong idea. But in the real 'Harry Potter' world, there is no relation to Hades at all. The magic in 'Harry Potter' is about wands, spells, and magic schools, not related to Greek gods like Hades.
I can't really think of any valid reason. It might be a completely misinformed idea. Maybe someone who is not very familiar with either Harry Potter or Vergil's works just made a wild and incorrect assumption. But in reality, there is no connection between them in terms of story, theme, or origin.
Maybe if someone has a really wild imagination and starts to draw very tenuous connections in their head. For example, they might see some similarities in the idea of a hero's journey in both - Harry Potter's fight against Voldemort and Sonic's battles against Dr. Eggman. But these are very superficial and don't make Harry Potter Sonic fanfiction. In reality, the two are so different in terms of setting, characters, and overall story that it's just a baseless thought.
Well, it could be that they are new to the world of both Harry Potter and the source of Kakuzu. And without proper knowledge, they might assume that since both involve elements of the supernatural or magic in some way, that there is a connection. However, as we know, Harry Potter has its own rich tapestry of magic, such as the magic taught at Hogwarts, the magic of the wizarding families, and the dark magic associated with Voldemort. And Kakuzu comes from a completely different context with its own set of rules and characteristics. So it's just a case of misinformation or lack of in - depth understanding.
Maybe they are misinformed. They could have seen some fan - made content that focuses a lot on elves in the 'Harry Potter' universe and wrongly assumed that the whole series is an elf fanfiction. But the core of 'Harry Potter' is so much more than that.
Some people might misinterpret the action and danger in 'Harry Potter' as violence. For example, the duels between wizards could be seen as violent, but they are actually a part of the magical world's rules and self - defense. Also, the battles against Voldemort and his followers might seem extreme, but they are essential for the story's plot about good triumphing over evil.
It's a very strange thought, but perhaps someone who is very confused or misinformed might think so. Maybe they don't fully understand the nature of either Harry Potter or Sentry fanfiction. It could also be a result of a really wild and baseless theory that has no real foundation in the facts of the two fictional works.
Perhaps they are misinformed. They might not be fully aware of the distinctiveness of the Harry Potter universe and be making unfounded associations. Maybe they are confusing some general fantasy elements like magic and strange creatures, but in reality, the detailed world - building in Harry Potter is far from being related to Daedra fanfiction.
They might be completely wrong. It could be that they are misinformed or have a very strange misunderstanding of what Harry Potter actually is. There's no connection between the two in terms of the core concepts of the series.
They might be very confused. Maybe they haven't read either series properly. They could be misinterpreting some of the action scenes in Harry Potter as similar to Hitman, but in reality, the magic - based battles in Harry Potter are nothing like the assassinations in Hitman.
Probably they are just very confused. Maybe they don't really understand the fundamental concepts of either Harry Potter or Archer. Harry Potter is full of magic and wizardry, while Archer is something else entirely.