Yes, there might be. There are countless fanfictions out there in the vast world of Harry Potter fan creations. However, the 'King of Hell' concept is likely a very unique and perhaps a darker, more alternative take on the Harry Potter universe. You can try searching on popular fanfiction websites like Fanfiction.net or Archive of Our Own.
One possible plot could be that Harry, after defeating Voldemort, discovers a new and darker threat emerging from the underworld. He is somehow chosen or forced to become the King of Hell to maintain the balance between the magical world and the nether regions. He then has to learn the rules and powers of the underworld while still dealing with his friends and the remaining prejudices in the wizarding world.
In many Harry Potter fanfictions, Daphne Greengrass might be portrayed as a Slytherin student with her own unique traits and storylines. Sometimes she's a friend, sometimes an adversary, or even a love interest, depending on the author's imagination.
There could be. The Harry Potter fandom is huge and very creative. Writers like to explore different concepts and personas for the well - known characters. A 'Harry Potter is a mafia king' fanfiction would be a very different take on the character, but it's entirely possible that it exists out there among the countless fan - made stories.
I think 'Harry Potter Hell Spawn Fanfiction' might be centered around a very particular subset of fan - created stories. It could be that some fans are exploring the darker aspects of the Harry Potter world, like what would happen if Voldemort had managed to create some sort of unholy abomination. It could also be about exploring the afterlife in the Harry Potter universe in a very dark and untraditional way, perhaps with 'hell spawn' - like entities emerging from the depths of some dark magical realm.
It could be about a very unique and wild crossover. Maybe it involves Harry Potter characters interacting with archangels in a hell - like setting. It might explore how the magic of the Harry Potter world combines with the celestial and infernal elements of archangels and the concept of hell.
The plot might revolve around the 'Princess of Hell' trying to bring some sort of hellish influence into Hogwarts. For example, she could be on a mission to corrupt the students or steal some powerful magical artifacts from the school for her own dark purposes. However, Harry Potter and his friends discover her plans and try to stop her. They might face many challenges as her powers could be quite different from the usual dark wizards they've faced.
The 'harry potter the other side of hell fanfiction' may center around the idea of redemption or damnation in the context of the Harry Potter world. It could show how certain characters, who might have been on the verge of turning to the dark side in the original story, are fully immersed in a hellish situation in this fanfiction. The story might also introduce a new set of rules for magic that are unique to this hell - like side of the Potterverse. There could be different factions among the characters, some trying to escape this hellish place, while others are trying to gain power within it.
In this fanfiction, perhaps the 'Prince of Hell' is an ancient evil that has been slumbering for ages. Harry, being the hero, stumbles upon some old prophecies or artifacts that lead him to this discovery. His friends may not believe him at first, but as strange events start to occur around Hogwarts, they realize that Harry might be onto something really big and dangerous. He then has to find a way to stop this 'Prince of Hell' from causing chaos in the wizarding world and the Muggle world alike.