From the title 'sakura was at mist prison fanfiction', Sakura is the main character we know of for sure. But it's very likely that there will be other main characters too. For instance, there could be a mysterious figure in the prison who has some kind of knowledge or power that Sakura needs. There could also be a character who represents the authority in the prison, like a strict guard or an administrator. And perhaps there's a fellow inmate who becomes Sakura's ally and together they face the challenges of the prison life.
Since the title only mentions Sakura, she's likely to be one of the main characters. But there could be others, like the prison guards or fellow inmates. Maybe there's a character who befriends Sakura or an antagonist who makes her life difficult in the prison.
Obviously, Sakura is one of the main characters. In many such fanfictions, there could also be characters like Naruto and Sasuke who interact with Sakura in different ways due to her being from the Hidden Mist. Maybe Kakashi could also be involved to mentor or guide her.
I'm not sure specifically as there could be many different takes on it. It might be about a character named Sakura who is in a place called Mist Prison. Maybe it involves her experiences there, like facing challenges, meeting new characters, or trying to escape.
I'm not entirely sure, but it could be some of the survivors from the original 'the mist' story. They might have different personalities and skills that are further explored in the fanfiction.
Obviously Sakura is one of the main characters since she is in the title. There might also be characters who put her in the sound prison or those who might try to help her escape.
There could be the prison guards. Some might be cruel and strict, while others could be more sympathetic. Also, other inmates. Maybe an older, experienced inmate who becomes a mentor - like figure to Sakura.
Sakura's teammates from her original team could be likely characters. They would be worried about her and try to figure out a way to get her out. There could also be some local Kirigakure ninja who are curious about this outsider in their prison and interact with Sakura in different ways, either as friends or foes.
Kakashi could also be a main character in certain 'naruto red mist fanfiction'. His experience and knowledge could be important in figuring out the mystery of the Red Mist. He might be mentoring the younger characters on how to handle the new threats and challenges that the Red Mist brings.
I'm not entirely sure about all the main characters specifically, but there are some ordinary townspeople who play significant roles as they try to survive the mist.
It's also likely that there are other prisoners in the sound prison. They could be from different worlds or have different powers. And together with Sakura, they form a sort of resistance against the prison's regime.
Well, Naruto himself is usually a main character as it's in the title. But characters from the Mist Village like Zabuza and Haku are often prominent. Zabuza is a well - known and feared ninja from the Mist, and his backstory and possible further development can be a big part of the fanfiction.