Interesting fanfics often play with the idea of Percy using his intelligence, which was shown in the books, in the context of the Scarlet Pimpernel's adventures. Maybe he uses his knowledge of wizarding bureaucracy to outwit his enemies. Also, the relationships he forms during his Scarlet Pimpernel - like escapades, whether it's with old friends from Hogwarts or new allies, add depth to the story. The settings, too. If the fanfic takes Percy to different magical or Muggle locations, it can create a whole new world of adventure.
You could start by looking on popular fanfic websites like Archive of Our Own (AO3). Just search for 'Percy Weasley Scarlet Pimpernel' in the search bar and browse through the results. There might be some great stories there.
Marguerite St. Just is also an important character. She is a beautiful and intelligent woman. Her relationship with the Scarlet Pimpernel adds a romantic aspect to the story. At first, she is unaware of his true identity but later becomes an important part of his adventures.
They often feature a heroic protagonist. In the Scarlet Pimpernel novels, the main character is known for his daring rescues. He uses his wits and charm to outwit the enemies.
One great 'Percy Weasley Adopted' fanfiction is 'A New Family for Percy' on FanFiction.net. It explores how Percy's life changes when he's adopted into a different wizarding family. The story delves into his new relationships and how he adapts to their ways.
Yes, in some fanfiction, Percy Weasley can be seen as neglected. Fanfic writers might focus more on the main trio or other more 'popular' characters. Percy is often depicted as a bit of an outcast in the official series, and this can be exaggerated in fanfiction. Writers may not explore his character depth as much as others, leaving him in a state of relative neglect compared to characters like Harry, Hermione, or Ron.