Science fiction often inspires technological advancements by imagining future possibilities. It also helps us explore different social and ethical scenarios that might arise from those advancements.
I think Stowe wanted to expose the harsh realities of slavery and inspire social change through her novel. She might have also hoped to touch people's hearts and make them think about the humanity of those enslaved.
Often, Hermione uses her vast knowledge of magic. For example, she might use a time - turning spell, like in many fics. This allows her to go back to the time when James and Lily were in danger and interfere to save them.
I'm not sure as the statement doesn't provide much context. Percy could be a character unique to that particular fanfiction. It might be a character created by the fanfiction author with certain special traits since they are described as 'the oldest being' in this work.
Percy in 'percy controls poison fanfiction' could be a character that the fanfiction author has designed with unique abilities related to controlling poison. Maybe it's someone inspired by a real - life figure, a historical character perhaps, but more likely it's a fictional creation within the realm of the fanfiction. It could also be that Percy is a character borrowed from a popular book, movie, or game series, and the fanfiction writer has given them this new role of controlling poison for the purposes of their story.