Obviously, Naruto is one of the main characters. He is the central figure from the Naruto universe. And then there would be characters from the orc army. There might be an orc chieftain who leads the orc army and interacts with Naruto, whether as an ally or an antagonist at times.
Another storyline might involve Naruto trying to understand the orc culture within the fanfiction. He could learn their ways of combat, their social structure, and in turn, the orc army could learn from the ninja skills of Naruto. For example, Naruto teaching them how to use chakra in a different way.
Well, he might use his powerful jutsu like the Rasengan. He could also summon his toads to help him out in the battle against the army. Maybe he uses his shadow clone technique to confuse the enemy and then strike them when they're vulnerable.
The cultural clash and subsequent understanding is also special. Naruto, coming from a world of ninjas, has different values compared to the orcs. But as the story progresses, they learn from each other. Like the orcs might learn about stealth from Naruto, while Naruto learns about the orc's strong sense of community.
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.
Perhaps it's for exploration. Naruto is always curious about the world outside. The robots can be sent to explore dangerous or uncharted areas where it might be too risky for humans to go. They can collect information and report back to Naruto.
Maybe Naruto has some knowledge from an unexpected source. For example, he could have met a wandering inventor who taught him the basics of robotics. With his determination and quick learning ability, he then starts building the robot army. He might also use his chakra in some unique way to power or control the robots.
Well, Naruto himself would probably be really excited. He'd be running around the military base, trying to make friends with everyone. His positive attitude might initially seem out of place in the strict military environment but could also start to change the atmosphere, making it more lively.
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.