Who might be the main characters in 'sakura hides her pain fanfiction' aside from Sakura?

Her closest friend might help her. Someone who really understands her and is willing to keep her secret. For example, Ino could be that friend. Ino has always been there for Sakura in the original story, so she could be the one to support Sakura during this difficult time.

Maybe Sakura's adoptive parents. Their relationship with Sakura could be explored further in relation to the discovery of her real mother. They might have some secrets of their own regarding how they came to adopt Sakura or they could be in conflict with Sakura as she tries to find her real mother.

Well, Naruto would be a likely character. He and Sakura are friends, and he'd probably be really worried about her. He might visit often and try to cheer her up with his goofy antics. Another could be Sasuke. Even if he's a bit more aloof, his presence would add an interesting dynamic. He could come to see her out of his own sense of obligation or perhaps a deeper, unspoken feeling.

Perhaps Sakura is dealing with family issues. She could be hiding the pain of having a difficult family situation, like an overbearing parent or a family member with an illness. In the fanfiction, she might focus on her school or ninja work to distract herself from her family problems.

It could be Naruto. Since he has always been a big part of Sakura's life, he might be one of the main characters trying to figure out what's wrong with Sakura and how to bring back the old her.

Tsunade could be a significant character. As the Hokage and a medical expert like Sakura, she could have some knowledge about the crystal. She might offer advice or warnings to Sakura. Then there's Shizune, who could assist Tsunade in dealing with Sakura and the crystal situation. And of course, Orochimaru might be a potential villain, interested in the crystal's power for his own dark experiments.

Sakura's friends like Naruto and Sasuke could be main characters. They might be the ones trying to find a way to save her. They could be using their skills and powers to look for a cure or a solution.

Sakura herself is obviously a main character. There could also be Naruto and Sasuke. Maybe Sakura misses her chance with Sasuke because she didn't speak up when she had the opportunity. Naruto might be involved as a friend who tries to encourage her but fails. Another character could be Kakashi, her sensei, who might have given her advice that she didn't follow, leading to her missing the chance.

There could be some original characters created specifically for this fanfiction. Maybe a mysterious mentor figure who claims to be able to help Sakura control her dark side, but has their own ulterior motives. Also, her sensei Kakashi could be there, trying to figure out how to guide Sakura through this difficult time.

Naruto could be a great addition. His friendship with Sakura and his complex relationship with Kabuto in the original series could add an interesting dynamic. For example, Naruto might suspect something is going on between Sakura and Kabuto and try to interfere or understand what's happening.