Sakura could be a leader. She has strong medical ninjutsu skills and is also a very capable fighter. She could lead the medical unit in Naruto's army, taking care of the injured and also providing strategic advice based on her intelligence. Another possibility is Shikamaru. He is known for his brilliant strategic mind. He could be in charge of planning the army's movements, setting up traps, and devising battle plans to outwit the enemy.
Well, Naruto has a lot of powerful jutsus at his disposal. His Rasengan alone can cause a great deal of damage. He could also use his shadow clones to create distractions and attack from multiple angles. And let's not forget his Nine - Tails chakra. With that, he could boost his strength and speed to take on a large number of enemies at once.
Naruto would face the psychological challenge of fighting alone. He is used to having his friends by his side. Without their support, he might have moments of self - doubt. The army might also use psychological warfare against him. They could taunt him or try to make him angry to disrupt his focus. In terms of actual combat, the coordination within the army could be a big obstacle. If they are well - organized and work together effectively, they could set up complex traps and ambushes for Naruto. And if the army has access to some sort of large - scale destruction jutsu, Naruto would have to find a way to either avoid it or counter it.
One possible plot could be that Naruto, after becoming Hokage, decides to form an international army to combat a new and powerful threat that endangers all the ninja villages. This army would consist of ninja from different villages who have put aside their old rivalries under Naruto's leadership.
Well, he might start by using his charisma. Naruto has always been good at making friends. He could reach out to old allies from his village, like Shikamaru and Choji. Also, he might convince some of the outcast ninja who have been mistreated in other villages to join him. His reputation as a hero who saved the world would surely attract a lot of people.
Well, obviously Naruto's friends like Sasuke, Sakura, and Shikamaru could be part of the army. Sasuke with his powerful Sharingan and combat skills, Sakura with her medical ninjutsu and newfound strength, and Shikamaru with his strategic mind. Also, ninja from other villages like Gaara from the Sand Village, who has his own unique abilities and a bond with Naruto, would likely be in the army.
Maybe Naruto creates the robot army as a way to bridge the gap between the ninja villages. He uses them for peaceful purposes like construction and rescue operations at first. But then, a rogue group tries to steal the robots and use them for evil, so Naruto has to fight to protect his creation. Well, in this fanfiction, the robots could be powered by chakra, which gives them an interesting twist. They might also be able to learn ninja techniques from Naruto and the other ninjas, making them a formidable force not just in terms of brute strength but also in combat skills.
He might become a hero in the eyes of some people. But he could also be feared by others who see his power as a threat.
It could be a mad scientist - type ninja who creates the droid army. This ninja might be someone who was shunned by the ninja community for his unorthodox ideas about mixing technology and ninjutsu, and now wants revenge by using the droid army to take over.
It could be Orochimaru. He's always been into strange experiments. He might create a robot army to get revenge on the village or to prove his superiority.
Naruto is sure to be a central figure. Then there could be a new character, a half - demon who acts as a bridge between the ninja world and the demon army. Hinata might also be involved, perhaps using her Byakugan to discover secrets about the demon army. And of course, Kakashi could be there to guide Naruto and the others in dealing with this new threat.