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.
One interesting plotline could be the discovery of new powers related to the chakra chains. For example, a character might find out that the chakra chains can be used to not only bind opponents but also to transfer chakra in a unique way, allowing for unexpected team - ups or power - sharing moments.
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.
One popular plotline is Naruto achieving an even greater mastery of chakra and using it to reshape the ninja world. For example, he might use his chakra to create sustainable peace by eliminating all sources of hatred. Another is Naruto ascending to a true god - like status and being able to manipulate chakra in ways that were previously thought impossible, like creating new jutsu on a whim. And some fanfictions focus on Naruto's chakra being connected to a much larger, cosmic source of energy, leading to epic battles against otherworldly threats.
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.
One example could be a fanfiction where male chakra users from different clans in Naruto come together to form a special task force. They could be on a mission to protect a secret chakra source that only male chakra can access. This would create interesting dynamics as they have to work together, despite their clan rivalries.
One interesting fanfiction could be 'Naruto: The Chakra Prodigy'. In this story, Naruto's unique chakra as the only male with a special form of it leads him on a journey to discover ancient secrets. He faces new enemies and allies that are drawn to his distinct chakra signature.
One possible plotline could be Naruto, as a male, having some kind of special connection with Ophis. Maybe he discovers a power within himself that is related to Ophis' nature. For example, he could gain the ability to control a certain type of magic or energy similar to what Ophis has.
It could be the result of some kind of special training. Maybe he met a hermit who taught him a unique technique to perceive chakra in a visible way. For example, this hermit might have had him meditate in a special chakra - rich area and gradually opened his eyes to the world of visible chakra.
Naruto might also go through an identity crisis. His whole life has been centered around being a ninja with chakra and using powerful jutsu. Losing his chakra could make him question who he is and what his purpose is. He would have to redefine himself and find a new way to contribute to the ninja world. This could be a long and difficult process for him.