He might rely on his physical strength and martial arts skills. Just like Rock Lee in the original series who doesn't have much chakra but is a great fighter through intense physical training.
Well, he could use his intelligence. Maybe he studies his opponents' weaknesses and uses the environment to his advantage. For example, setting up traps or using distractions. He could also team up with others who have different abilities and play a strategic role in the team, like being a decoy or a planner.
Another possibility is that he discovers some new power that is not related to chakra. In fanfiction, the sky's the limit. He could find some ancient artifact that gives him special powers, or he might have a unique genetic trait that he didn't know about before that allows him to do things like super - speed or enhanced senses, which would help him in combat.
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.
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.
He would become more reliant on his friends and allies. Since he doesn't have chakra to fall back on, he has to trust others more and learn to work in a team in a different way.
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.
In some fanfictions, Naruto might learn to use chakra chains through special training. Maybe he discovers a new form of chakra control or he is taught by a mysterious character who has knowledge of this unique ability.
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.
He could develop enhanced physical abilities. Since he can't rely on chakra, he might focus on building muscle strength and speed through intense physical training. He could also become an expert in using various ninja tools. For example, he could master the use of shuriken and kunai in ways that others haven't. Another ability could be better observational skills. He'd need to be more aware of his surroundings and his opponents' movements without the help of chakra - based sensing techniques.
If Naruto couldn't use chakra, the entire story would be drastically different. Firstly, he wouldn't be able to perform his signature jutsus like the Rasengan. His training with Jiraiya would also take a different turn as they couldn't focus on chakra - based skills. Without chakra, Naruto might have to rely more on his physical strength and strategic thinking. He could develop unique fighting styles that don't involve chakra, perhaps something similar to real - world martial arts. This would also change his relationships. For example, Sasuke, who is very chakra - powerful, might view Naruto in a different light. It could lead to a more complex and less predictable plotline.
If only females can use chakra in this fanfiction, the power dynamics would be turned upside down. The male characters we know, like Naruto and Sasuke, would be powerless in terms of chakra usage. Female characters would dominate in all aspects related to chakra - combat, healing, and jutsu creation. This would lead to a new social structure in the ninja world, where female ninja are at the top of the hierarchy due to their chakra - based abilities.
In some fanfictions, Naruto might absorb Chakra through a special jutsu. For instance, he could use a self - created jutsu that allows him to draw in Chakra from his surroundings or from other characters he's in contact with.