Obviously, the first male ninja would be the main character. But there could also be his mentor, someone who guides him in his ninja training. Maybe an old and wise ninja who has a lot of knowledge about different jutsus.
One possible main antagonist could be an ancient evil ninja who was sealed away long ago and is now awakened by Naruto's new - found power. This antagonist might see Naruto as a threat to his plans of world domination and tries to stop him at every turn.
Naruto himself is likely to be a main character. Since it's related to Naruto, he'll probably be at the center of the story, with his journey to become Hokage or his relationships with other characters like Sasuke and Sakura being explored further.
Naruto Uzumaki himself is extremely popular. His journey from an outcast to a hero provides a rich base for fanfiction. Sasuke Uchiha is also a common choice. His brooding nature and his quest for power and revenge make for interesting storylines. Kakashi Hatake is popular too. His mysterious past and his skills as a ninja are appealing to fanfiction writers. Rock Lee is another one. His determination to succeed despite not having natural ninja talents like others is an inspiring aspect that can be explored in fanfiction.
The plot could center around the first male ninja facing some great threat to the ninja world. He might be on a quest to find a powerful jutsu or artifact to save everyone. Along the way, he could encounter various challenges, make new friends and enemies, and his character could develop as he overcomes these difficulties. For example, he could start as a novice and gradually become a respected and powerful ninja.
The main character, the first male born, might have a rival who is also from a powerful clan. This rival, let's call him Ren, could constantly challenge him. Hinata could be another important character, providing emotional support to the main character. She might see his potential and encourage him when he feels down. And of course, Sasuke could make an appearance, being a source of inspiration for the first male born in terms of power and determination.
Well, Shikamaru Nara pops up a lot in fanfiction. His intelligence and laid - back attitude make for interesting stories. Rock Lee is another common character. His determination and unique fighting style are great for fanfiction plots. Gaara of the Sand is also frequently used, especially stories exploring his redemption and growth.
In this fanfiction, Naruto could be given god - like speed, strength, and intelligence. Since he is the first male ninja with these powers, he decides to rewrite the rules of ninjutsu. He might start training other ninjas in a new way that focuses on inner power rather than just physical techniques. This could lead to a revolution in the ninja world where Naruto is seen as a pioneer and a hero.
Kakashi could also be the main character in a different take on 'naruto rogue ninja fanfiction'. Imagine if for some reason, Kakashi was framed as a rogue ninja. He would have to use his intelligence and combat skills to clear his name while also dealing with the challenges of being an outcast. He might even discover some dark secrets about the Hidden Leaf Village in the process.
Perhaps it could be a powerful ice spirit that has been awakened by some dark jutsu. This ice spirit has no concept of good or evil but is causing destruction as it spreads ice everywhere. Naruto and his friends would have to find a way to either seal it or make it understand the harm it's causing. In this case, the ice spirit would be the main antagonist as it opposes the well - being of the villages.
The Leaf Village authorities could be the main antagonists. Since Naruto is now considered a rogue, they would be the ones trying to hunt him down. They might see him as a threat to the village's stability and security.