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 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.
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 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.
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 suitable character could be a healer's daughter. She has grown up seeing the power of natural remedies and has a natural inclination towards magic. She is kind - hearted and intelligent, which would make her a great apprentice for Merlin. Also, a young noble who has been shunned by his family for his strange dreams (which are actually premonitions due to his budding magic) could be an interesting choice. Merlin would see the potential in him and take him as an apprentice.
In many fanfictions, they have a very close relationship. Merlin often looks out for his sister and she does the same for him. They share secrets, especially about Merlin's magic, and support each other through difficult times.
One popular 'Harry Potter has muscles' fanfiction might be where he uses his newfound muscular physique in a duel. Maybe he's able to overpower his opponents more easily with his strength, adding a new dimension to the magical battles.