One possible motive could be a misunderstanding. Maybe Hercules is framed for something really bad, and Percy, believing the false information, decides to take action. For example, if there's a plot where Hercules is made to seem like he's about to destroy a city full of innocent people, Percy might feel it's his duty to stop him, even if it means killing him.
It could lead to new alliances and enmities. Characters who were friends with Hercules might turn against Percy, while those who had issues with Hercules could see Percy as a new ally. This would completely disrupt the existing power dynamics in the mythological universe. And it might also inspire new fanfictions exploring these new relationships.
I'm not sure specifically about this particular fanfiction. Fanfiction can cover a vast range of scenarios, and while this is a rather unorthodox and not very positive one in the context of the characters, it might exist in some corner of the fanfiction world. You could try searching on popular fanfiction websites.
One similarity could be their heroic natures. In fanfiction, both are often depicted as trying to do the right thing. Percy is always saving his friends and the world from various threats, and Hercules is known for his heroic deeds. Another similarity might be their connection to the gods. Percy is the son of Poseidon, and Hercules is a son of Zeus in the original mythology, so in fanfiction this divine connection could be explored in similar ways, like having to deal with the expectations and powers that come from being related to the gods.
There could be. Fanfiction allows for all kinds of wild ideas. Given that Percy is a character in the Harry Potter series and Voldemort is the main villain, it's not surprising that someone might come up with a story where Percy manages to kill Voldemort. It might be a really unique read, delving into how Percy, with his own set of skills and personality traits, could achieve such a feat.
Yes, there might be such fanfictions in the vast world of fan-created content. However, it would be a rather dark and non - canonical take on the relationship between the characters, as it goes against the general narrative where they are more often allies or rivals in a less fatal way.
Most Percy fans would probably be outraged. Percy and Annabeth have a very special relationship in the original story, and fans are quite attached to it. This kind of fanfiction would seem like a betrayal of that relationship.
A possible plotline could be Percy seeing the movie and getting into an argument with another camper about whether Hercules' deeds were more impressive than his own. They could start listing their respective adventures and how they overcame challenges, leading to a friendly competition within the camp.
One great fanfiction could be where Percy Jackson watches 'Hercules' and starts comparing the demigod Hercules in the movie to his own life as a demigod. He might be amazed at how some aspects are similar, like the struggle with identity and the need to prove oneself. In this fanfiction, he could be sitting with his friends from Camp Half - Blood, and they all start making jokes and observations about the movie.