Well, Naruto is the central figure for sure. But other characters like Kakashi could also be important. He might be the one guiding Naruto through the process of adapting to his new robotic body. And then there could be new characters introduced, perhaps other half - robot ninja created by the same process as Naruto, and they could either be friends or foes.
Well, obviously Robot Boy and Robot Girl are the main characters. Robot Boy is often depicted as having great physical strength and a bit of a naïve charm. Robot Girl is usually more in - tune with emotions and has advanced problem - solving abilities.
It could be a rogue god who sees the half - robot as a threat to the natural order. They might try to destroy it because they don't like the idea of a half - human, half - machine being in the world of demigods. Another possibility is a powerful Titan who was awakened and wants to use the half - robot's technology for their own evil purposes. Maybe the half - robot has some sort of power source that the Titan desires.
Well, in 'Naruto half robot fanfiction', a cool concept might be the integration of new technology into the Naruto universe. The half - robot Naruto could have advanced sensors that give him an edge in battle, like being able to detect hidden enemies or traps more easily. Also, his robotic parts could be customizable, allowing him to adapt to different combat situations by swapping out components.
Well, Naruto would obviously be the main character as the story is centered around him being a half - demon. There might also be characters like Sasuke. Sasuke could be involved in Naruto's journey, perhaps initially being suspicious of Naruto's new powers but later coming to accept and even help him control them.
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.
It could be Kabuto. Since he has a lot of knowledge about medical ninjutsu and experiments, he might see Naruto's robotic form as a threat or something he can use for his own evil purposes. He could try to control Naruto's robotic functions and turn him against his friends.
In Naruto half - god fanfiction, characters like Jiraiya can be quite popular. Since Jiraiya was Naruto's mentor, in these stories he could play an important role in helping Naruto come to terms with his half - god heritage. Additionally, characters like Hinata might be popular as well. Her relationship with Naruto could be explored in a new light, considering Naruto's new - found and powerful status.
There can also be the scientist or inventor who is either responsible for the transformation or is trying to reverse it. This character adds a scientific aspect to the story and might have their own motives and secrets.
It could be a dark sorcerer who has been studying the secrets of angels and vampires. He discovers Naruto's existence and wants to use him as a key ingredient in a dark spell. The sorcerer is power - hungry and believes that by harnessing Naruto's half - angel half - vampire essence, he can open a portal to a dimension filled with dark magic and bring chaos to the ninja world. He would be constantly devising traps and sending minions after Naruto to capture him.
It could be a powerful ninja from another village who is jealous of Naruto's half - demon half - god powers. He might see Naruto as a threat to his own village's dominance and try to eliminate him.