Definitely Naruto is a main character in this type of fanfiction. His hair is almost like a trademark. But other characters like Ino could also be part of it. Her blonde hair could be used in jutsu related to illusions perhaps. Shikamaru, despite his lazy - looking ponytail, could have some unique hair jutsu in fan - made stories. His intelligence could be used to develop very strategic hair jutsu.
Naruto himself could be one of the main characters associated with it. Since he has such iconic spiky hair, it's easy to imagine him developing some unique hair jutsu. Sakura might also be involved, as her long hair could be used in interesting ways in fanfiction. And Sasuke, his cool and somewhat long hair could also be a factor in hair jutsu - related stories.
Naruto himself is often a main character in these fanfictions as he has a connection to the Hiraishin no Jutsu through Minato. Also, Minato is frequently featured as he was the original user of the jutsu. Sasuke can also be involved as he and Naruto have a complex relationship and their interactions can be explored in relation to the jutsu.
Naruto himself is likely to be involved. After all, he's always at the center of new jutsu developments in fanfiction.
Naruto himself is often a main character in such fanfiction as he is the protagonist of the original series and has a knack for learning new jutsus.
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.