Often, there could be an original character created specifically for the fanfiction. This character discovers they have the eagle bloodline and has to learn to control its powers.
Sometimes, it could be a side character from the original Naruto series who is revealed to have a hidden eagle bloodline. For example, a character from a minor clan who then becomes important because of this bloodline ability.
There might also be crossovers where a character from another anime or story is introduced into the Naruto world and has the eagle bloodline. They would then bring their own unique set of skills and personality traits while interacting with the Naruto characters and exploring the implications of the eagle bloodline in this new setting.
In some cases, characters like Sakura could be main characters. She could play a role in helping the character with the fallen angel bloodline adjust to the ninja world. Maybe she uses her medical skills to deal with any negative effects the bloodline might have on the body. Also, there could be other original characters who are part of the same family or group as the fallen angel bloodline character and are important in the story.
Often, Naruto himself might be associated as he is the main character of the original series. Writers may give him the devil bloodline to explore how it changes his character and abilities.
Some original characters created by fanfiction writers might also be the main focus. These could be characters who are born into a family with the rinkaku bloodline and their journey to master it while facing the challenges of the Naruto world, like dealing with other powerful clans and the ever - present threat of the Akatsuki.
Often, Naruto himself can be a main character. He might be the one who either inherits or has some connection to the Predator bloodline, which then changes his abilities and his role in the story.
Often, new original characters are created who possess the seduction bloodline. They are usually the focus of the story as they navigate the Naruto universe with their unique abilities.
Naruto himself is often a central character. Since he has his own unique chakra nature and potential, fanfictions might explore how his own abilities interact with different bloodlines. Sasuke is also common, given his Sharingan bloodline. Hinata could be involved as her Byakugan bloodline is quite interesting. And sometimes, new or original characters created specifically for the fanfiction might also be main characters, especially if they possess some sort of rare or infamous bloodline.
Sometimes, it could be a reimagined version of an existing 'naruto' character who discovers they have this assassin bloodline. For instance, Sasuke could be written to have a hidden assassin bloodline that awakens, leading to a whole new set of adventures and power - ups for him.
Often, an original character created by the fanfic author is the main character, someone who discovers they have the darkness bloodline. This character may be an orphan or someone with a mysterious past.
There are also original characters that are created specifically for these fanfictions. These original characters might be the sole bearers of the demigod bloodline. They come into the Naruto world and disrupt the existing power balance. They could befriend or oppose the well - known Naruto characters depending on the plot of the fanfiction.
Well, the main characters can vary widely. Besides Naruto and Sasuke, Hinata could potentially play a role. She might befriend a character with the candy bloodline and help them adapt to the Hidden Leaf Village. There could also be antagonists in the fanfiction who target those with the candy bloodline. These could be rogue ninjas or even members of other villages who see the potential of the candy bloodline as a threat to their own power. And of course, there are always the original characters that the author creates to really drive the story forward and showcase the unique aspects of the candy bloodline.