Yes, there might be. You could start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'Percy has abs' and you'll likely find some works. However, the quality can vary greatly, so it might take some time to sift through and find ones that are really well - written.
One common theme could be self - confidence. If Percy has abs, it might signify that he has been working on himself physically, which could lead to a boost in his self - esteem. Another theme could be attraction. Other characters in the fanfiction might be drawn to Percy because of his new physical feature.
You can try Archive of Our Own (AO3). It has a large collection of fanfictions, including many related to Percy Jackson. Just search for 'Percy Jackson abs' in the search bar, and you'll likely find some interesting ones.
One great Percy Jackson abs fanfiction is 'The Muscular Demigod'. It focuses on Percy's physical training regime which results in his amazing abs. It also weaves in his relationships with other characters while he's showing off his new physique.
It could be a symbol of Percy's growth and maturity. His physical development might represent his journey from being a young demigod to a more confident and capable one.
Characterization is key. The author should stay true to the original Harry Potter characters' personalities while adding this new element of Harry having abs. For example, Harry should still be brave and kind, and his relationships with other characters should be believable. It also helps if the author can write engaging dialogue that makes the characters come alive.
One common plot could be Hermione using her newfound physical strength (due to having abs) in a dangerous situation at Hogwarts, like fighting off dark wizards. Maybe she surprises everyone with her combat skills.
Fanfiction.net could also be a good place to search. There are many different categories and tags. Search for 'Hermione' and then look through the results to see if there are any stories with the 'has abs' concept. However, the quality of the stories can vary a great deal on this site.
You can try fanfiction websites like Archive of Our Own (AO3). It has a vast collection of fanfiction, and you can search for 'Snape has abs' in the search bar. There are likely to be several stories that match your query.