One common theme is power enhancement. With the added muscle, Naruto is often portrayed as having greater physical power, which can translate into more effective combat abilities. For instance, his taijutsu could be on a whole new level.
One interesting aspect of Naruto having muscles in fanfiction could be how it changes his appearance and how other characters react. Some might be in awe of his new, more muscular look, while others might be a bit intimidated. It could also lead to new rivalries or friendships based on this change in his physique.
One common theme is the reaction of others. Characters in the 'naruto' universe will react to Naruto's new muscular form. Some may be jealous, some may be inspired. Also, the training process is often a theme. How Naruto endures tough training regimens to achieve his muscular physique is detailed in many fanfictions. In addition, there's the theme of using his new - found strength in battles against various enemies, which showcases his growth as a character.
Power dynamics is also a theme. His muscles can give him an edge in physical confrontations, which changes the power balance in his interactions. For example, in some fanfics, it makes the Slytherins more wary of him, as they see him as a more formidable opponent.
One common theme is self - discovery. When Merlin has muscles, he often has to re - evaluate his own identity and how he presents himself. For example, he might be seen as more of a warrior type, which is different from his traditional role as a servant and a secret sorcerer.
One great 'Merlin has muscles' fanfiction is 'Muscular Merlin's Adventures' on FanFiction.net. It really focuses on how Merlin's newfound muscles change his dynamic with Arthur and the knights. It has some really interesting character interactions and a unique take on Merlin's character development.
One popular 'Harry has muscles' fanfiction is 'Muscular Harry's Magical Adventures'. It explores a different take on Harry where his physical strength plays a role in his wizarding journey. He uses his muscles not just for physical tasks but also to intimidate some of his foes in a rather unique way.
You can try fanfiction websites like Archive of Our Own (AO3). It has a vast collection of fanfictions, and you can use the search bar to look for 'Harry Potter has muscles' specifically. There's a good chance you'll find some interesting stories there.
There's a 'naruto muscles fanfiction' where Naruto decides to train his muscles in a very unorthodox way. He goes to the mountains and endures extreme physical challenges that not only build his muscles but also his mental strength. This story shows how his new muscular physique gives him an edge in combat against powerful foes. In another fanfic, his muscle - building is tied to a secret clan technique he discovers accidentally, which changes the course of his development.