Naruto himself could be one of the main characters. Imagine if he discovers a secret tattoo on his body that he didn't know about before. It could lead him on a whole new adventure to figure out what it means and where it came from.
Sakura could be a main female character. Since Naruto and Sakura have a long - standing relationship in the original Naruto series, in this fanfiction, she could be the one Naruto is secretly interested in as a girl. Maybe Naruto is writing fanfiction about their future together.
It could be a mark that represents his family or a long - lost heritage. Perhaps it's a crest that has been passed down through generations in his family but he has to keep it secret for some reason, like it might draw unwanted attention from certain enemies or factions in the story.
It's hard to say without reading it, but it could be Naruto himself if the story is about a secret aspect of his genius that hasn't been explored in the original. Maybe he has some hidden intellectual ability that is only revealed in this fanfiction.
Naruto Uzumaki, the hero of the Hidden Leaf Village, is one of the main characters. He's known for his orange jumpsuit and his never - give - up attitude. Hinata Hyuga, with her unique Byakugan ability, is the other main character. She's often quiet and reserved, but she has a deep well of inner strength. In this fanfiction, they are likely to be at the center of whatever story is being told, whether it's a love story, an adventure, or a combination of both.
Well, Naruto is surely one of the main characters since it's in the title. And it's likely that the current or past Hokages could also be important characters, as Naruto is a secret fan of the Hokage. There might also be Naruto's friends like Sasuke and Sakura, who could be involved in the story, perhaps not fully aware of Naruto's secret.
There could be new characters introduced in this fanfiction. Maybe a mysterious ninja from a far - off land who knows about Naruto's secret and either helps or hinders him. Another possibility is that an old, forgotten character from the Naruto universe is brought back and has some connection to the secret.
There could be some traditionalist ninja in the village who oppose Naruto because she's a girl trying to break the norms. They might see her as a threat to the traditional male - dominated ninja culture and try to stop her from achieving her dreams and rising in the ranks of the ninja world.
Orochimaru would be a great main villain. He's always been interested in power and secrets, so a secret base full of forbidden knowledge would be right up his alley. He could be trying to use the resources in the base to create even more powerful jutsu or to bring back the dead.
The Akatsuki could still be the main villains. In a secret agent Naruto fanfic, they could be even more devious, using undercover agents of their own to disrupt the shinobi world while Naruto tries to stop their grand plan of collecting all the tailed beasts.
It could be a rogue ANBU member who has gone bad and is trying to expose Naruto's secret identity for some evil purpose.