There could also be a character who is a descendant of an ancient and powerful Kazama ninja. This character has to rediscover the secrets of their bloodline and use it to save their village or the ninja world from a great threat. They may have to battle against villains who want to steal or corrupt the power of the Kazama bloodline.
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.
Flight is a common ability. Just like bats can fly, characters with this bloodline in fanfiction might be able to soar through the skies of the Naruto world. Another is echolocation which helps them detect enemies or objects in the dark.
Well, in some Naruto Kazama bloodline fanfiction, there could be a hidden power within the bloodline that only gets unlocked under extreme circumstances. Maybe it's a form of enhanced speed or strength that comes out when the character is in a life - or - death situation. Also, the Kazama bloodline might have a unique way of chakra control that sets them apart from other ninja clans.
Sasuke is often a character associated with black chakra in fanfiction. Given his natural inclination towards power and his dark past, it's easy to imagine him being connected to such a powerful and mysterious form of chakra.
Often, Naruto himself might be associated with it in some fanfictions. Given his status as the protagonist, it's not uncommon to give him such a powerful ability. Another could be Sasuke, as his power - hungry nature in the original series could be explored further with the God Release.
Another character could be Kakashi. As a skilled and experienced ninja, he could play a role in guiding the character who obtains the Shinju fruit. He might be the one to recognize the true potential and danger of the fruit and try to ensure it is used for the greater good of the ninja world.
Sometimes, characters from other villages might also be involved. Maybe a ninja from Konoha who has a special encounter with the Nidaime Otokage. This could lead to an interesting exchange of ideas or a conflict that drives the story forward.
One of the main characters could be Hinata. Since she has the Byakugan, a fanfiction might explore the idea of her evolving it into a godlike doujutsu. Another character could be Madara Uchiha. His return in some form and obtaining a godlike doujutsu would be an interesting plot point. And of course, there could be mysterious, unnamed characters that are the center of the story in the fanfiction, with their godlike doujutsu being the main focus.
Often, Naruto himself is associated with neon powers in fanfiction. Since he's the main character of the original series, it's common to see him gain these new powers. His friends like Sasuke might also be involved, either having their own neon - related abilities or being affected by Naruto's new powers.
Naruto himself could be associated with it. Given his propensity for pushing his limits, he might be the one to discover or be forced into the situation related to the 'Gate of Death'. Another could be Sasuke. His quest for power might lead him to dabble with such dangerous concepts.