Another often - seen main character is Kakashi. Given his expertise in various ninja techniques, in fanfics he could be the one teaching the body flicker to younger ninjas. He might also use the body flicker in battles against new and powerful enemies, and the fanfic could explore his strategic use of the technique.
One interesting 'naruto body flicker fanfic' could be about a young ninja who masters the body flicker technique in a unique way. For example, they might combine it with another hidden jutsu to create a new combat style. This could lead to them becoming a hero in their village as they use this new ability to defend against powerful enemies.
Obviously Naruto himself is the central character. Since it's about his 'perfect body', he's the main focus. But often, Sasuke is also involved. Their rivalry could be intensified or changed in some way due to Naruto's new body. Sakura might also play a role, perhaps she's the one who first notices the changes in Naruto and tries to help him understand what's going on.
Sasuke is often a main character in 'eye naruto fanfic'. Since he has the Sharingan, many fanfics explore different aspects of his eye power, like how he might develop it further or use it in new and unexpected ways. Another one is Hinata. With her Byakugan, fanfic writers can create stories about her using it in battles or for some other special purposes, like finding hidden secrets in the ninja world.
Naruto himself is obviously a main character in these fanfics. His memories are the central focus after all.
Naruto is often a central character in naruto exams fanfic. His journey through the exams, with his determination and growth, is a common focus. His unique skills like the shadow clone jutsu play a big role in the exam scenarios.
Sasuke is also frequently a main character in these fanfics. Imagine if Sasuke had red eyes instead of his Sharingan. It could completely change his character arc. He might be even more of an outcast or have a different set of powers that make him both feared and respected. And then there are the Akatsuki members. Some fanfics might make one of them have red eyes and explore how that changes their role within the organization and in the overall Naruto story.
Naruto himself is often involved. Imagine a fanfic where Naruto finds a strange mask that gives him new powers, but also has some negative side - effects. Sasuke can also be a main character in such fanfics. He might be on a quest to find a mask that has a connection to his clan's history.
The Kazekage is the central figure in 'naruto kazekage fanfic'. But we also see characters like Sakura. She is a strong kunoichi and her medical skills could come in handy in a story set in the Naruto world. Another character often involved is Shikamaru. His intelligence could play a crucial role in any plot related to the Kazekage. And of course, the Sand Village elders might be important characters as they have influence over the Kazekage and the village's decisions.
Kakashi Hatake is often a main character in 'raikiri naruto fanfic' since he is the one who originally developed the Raikiri. His skills and the way he uses the Raikiri can be further explored in fanfics.
Naruto himself is often involved. He might use bubblegum in his usual impulsive and creative ways, like coming up with new pranks or battle strategies. Sakura could also be a main character. She could use her intelligence to develop new types of bubblegum or figure out how to counter an enemy using bubblegum. Sasuke might be involved too, perhaps reluctantly at first, but then finding that bubblegum has some unexpected uses in his quest for power.