A more militarized Naruto fanfiction could feature a world where the ninja clans are organized into military units. Each clan has its own specialty in combat, and they are all part of a larger military alliance. Naruto might find himself in the middle of a power struggle between different military - minded leaders. There could be espionage and counter - espionage operations between the villages. And perhaps the Akatsuki is seen as a rogue military force that the villages must unite against. This would change the dynamic of the story as characters have to think more like soldiers and less like lone ninjas.
Naruto would still be a very important character. His ability to inspire and his strong will could be used to boost the morale of the military. Kakashi would also be crucial, given his combat experience and strategic mind. He could be a top military advisor. Then there's Tsunade. As a former Hokage, she has the leadership skills necessary in a militarized setting. And Sasuke, with his powerful jutsus, could be a key figure in the military operations, either as a lone - wolf type of fighter or as part of a special forces unit.
Since it's a fanfiction, the possibilities are endless. 'Naruto no more mercy' could imply a change in the moral landscape of the Naruto world. It could explore how the characters develop when they step away from the traditional values of mercy. It might show how Naruto's friends and foes react differently when mercy is no longer a factor. There could be new power dynamics, new alliances, and new conflicts emerging as a result of this shift in the overarching concept of mercy in the story.
Beerus would likely be more powerful. He is a god of destruction in his own universe with incredible cosmic powers. Naruto is extremely powerful in his world, but his power is mostly based on chakra and ninjutsu, which is on a much smaller scale compared to Beerus' ability to destroy planets with a flick of his finger.
πI recommend the Book of the Confucian Sword Crossing the World and The Hero Never Died to you. The former was a traditional wuxia novel written by Sima Xie Lang. It described the story of the protagonist who went through all kinds of hardships for revenge. There were some military elements. The latter was also a traditional martial arts novel. The author had written it to reminisce about the martial arts classics. There were no elements of fantasy or transmigration, and it was fully restored to the style of ancient martial arts. I hope you like this fairy's recommendation. Muah ~π
One idea could be exploring Naruto's growth not just in terms of power from the Kyuubi, but also his emotional and mental growth. For example, how he overcomes the stigma of being the Kyuubi's host among the villagers who once feared and hated him. This could involve his relationships with characters like Iruka, who was one of the first to see Naruto as more than just a container for the Kyuubi.
One way is to explore different character perspectives. Instead of just following Naruto, write from the point of view of a side character like Rock Lee. It can add a fresh twist.
Another possibility in fanfiction is that Naruto forms a special bond with a powerful creature. Similar to how he had a bond with the Nine - Tails, but this time it could be a mythical beast from a different dimension. This bond might allow him to access a whole new set of powers, such as the ability to transform into a hybrid form with enhanced abilities like flight and super strength.
Sasuke could be one of the people to teach Naruto new jutsus. They have a friendly rivalry and Sasuke has some unique jutsus like his Rinnegan - related abilities. He could teach Naruto some aspects of the Rinnegan's power, or at least how to counter it more effectively which could be considered a new 'jutsu' in a sense.
In Naruto fanfiction, Hinata is often seen as a better match for Naruto. Hinata has been in love with Naruto for a long time. She has always supported him silently from the sidelines. Her gentle and shy nature can be a good complement to Naruto's more boisterous personality. Sakura, on the other hand, had feelings for Sasuke for most of the story, which makes her connection to Naruto seem less deep in comparison.