Naruto himself would probably be one of the main ones. He's always been associated with powerful chakra use in the original series, and in this fanfiction, with only males using chakra, he would stand out even more. Another could be Sasuke. His chakra abilities are also quite remarkable, and he would be a key male character in terms of chakra use in this fanfiction.
Kakashi could also be a main male character known for his chakra use. He has unique chakra - related techniques and a lot of experience. In this male - only chakra fanfiction, he would be an important figure to teach and guide the younger male characters in their chakra usage. And then there's Jiraiya. He has a vast amount of chakra and is known for his powerful jutsu. He would be a significant male character in this scenario as well.
Rock Lee could be a very interesting male character in this fanfiction. Even though he doesn't have the natural chakra - using abilities like some others at first, his hard work and determination to be a great ninja could lead to some unique developments in his chakra use in this male - only chakra fanfiction. He could be an example of how even those who seem at a disadvantage in terms of chakra can still become powerful through other means related to chakra.
Well, it could limit the power dynamics in the story. Since only males can use chakra, female characters might have to rely on other skills or abilities. This could lead to a more distinct separation between male and female roles, with males being the main fighters due to their chakra use.
Sasuke Uchiha could be one. Since he has the Rinnegan in the later parts of the Naruto series, it's possible that in fanfiction he could be using chakra chains in connection with his Rinnegan powers. Another could be Naruto Uzumaki if the fanfiction has some kind of plot twist where he also gains access to the Rinnegan and uses chakra chains in a new and unique way.
He might rely on his physical strength and martial arts skills. Naruto is known for his tenacity and determination. Without chakra, he could train his body to be extremely strong, like a super - athlete. He could use his speed and agility to dodge attacks and land powerful punches and kicks.
In some fanfictions, Naruto might use chakra strings in a similar way to how Sasuke uses his chakra to control his sword. He could send out his chakra in the form of strings to manipulate objects from a distance. For example, he could use them to pull weapons out of an enemy's hand or to tie up an opponent.
Well, male characters would have to find new ways to be relevant. Shikamaru, for instance, would probably enhance his strategic thinking even more. Rock Lee might become a role model for male characters as he already focuses on non - chakra - based Taijutsu. Female characters could experience a boost in confidence. Ino could develop her mind - control abilities further, now that she has more of a spotlight with males out of the chakra - using picture. And Tenten could become a master of non - chakra weapons, leading the way for other female characters.
Well, it would change the plot drastically. Males usually play a major role in using chakra in Naruto. Without male chakra users, female characters would have to step up more. For example, Sakura might become the lead in battles more often, and the whole power dynamic in the ninja villages would shift. Shinobi training for males would also be different, focusing more on non - chakra related skills like physical combat and strategy.
One more plotline could be that Naruto uses his unique chakra to form a new kind of ninja art. Since he is the only male with this chakra, he has the potential to create something that has never been seen before in the ninja world. This new art could be a combination of his unique chakra properties and his own creativity. It might start as an experiment, but as he hones it, it becomes a powerful tool that not only helps him in battles but also changes the way ninja warfare is perceived. His friends might be initially skeptical, but as they see the potential, they join him in exploring and perfecting this new art.
Well, a possible plotline could be that the male characters feel left out and start a revolution to gain equal rights in chakra usage. Or perhaps a female ninja discovers a way to transfer her chakra to a male, but it has unforeseen consequences. Also, there could be a plot where the female - only chakra users are hunted by an outside force that wants to control this unique power source for themselves.
Well, it depends on the specific fanfiction. Some fanfiction writers might choose to incorporate the concept of Chakra into Percy Jackson's world. They could create a scenario where Percy discovers a way to access and use Chakra, perhaps through some kind of magical cross - over event. However, not all fanfictions will do this as different writers have different ideas and directions for their stories.
It's hard to say for sure without reading it. But if it follows the Naruto pattern, Naruto himself could be one of the main characters. He's often at the center of things in Naruto - related stories.