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.
The characters can develop in many ways. For example, they might become more mature after seeing the horrors of war. A young Konoha ninja who was once naive could start to understand the realpolitik of the ninja world. Another way is through their relationships. If a Konoha ninja forms a bond with a ninja from another village during the war, it can change their perspective. They may also develop new fighting techniques or strategies as they face different opponents in the war.
In a 'spy ninja novel', the main character is likely to be the spy ninja. This character would be the focus of the story, with their actions driving the plot forward. There could also be other important characters, such as the villain they are up against. This villain might be a powerful criminal or a rival spy. Additionally, there could be supporting characters like the spy ninja's friends or allies from their spy or ninja community. They might provide help, information, or be in need of rescue at some point in the story.
The main characters in the ninja turtle story are the four turtles - Leonardo, Donatello, Raphael, and Michelangelo, and their sensei Splinter, as well as the villain Shredder.
I don't know the specific main characters in 'the ninja gamer fanfic' as it can vary greatly depending on the author's creation. But it could be a ninja - named protagonist like 'Kai' who is also a top - notch gamer.