Sakura is the central figure here. However, depending on the direction of the fanfiction, there could be new characters introduced. Maybe an old sage or a mysterious healer who claims to know about the curse mark. But the mainstay characters from the Naruto universe such as Kakashi Sensei could also be involved, guiding Sakura through this difficult time and helping her understand what the curse mark means and how to handle it.
There could be Naruto. Since he's Sakura's friend, he would likely be involved, trying to help her deal with the curse mark. He might use his own powers and experiences to support her.
Naruko is surely a main character. Additionally, there might be a mentor figure who helps her understand and control the curse mark. And perhaps there are antagonists, like those who want to take advantage of her situation or those who simply oppose her because of the mark.
I'm not sure specifically as there could be many different takes on it. But generally, it might involve Sakura getting a curse mark which could lead to her facing new challenges, perhaps having to deal with dark powers within her, and it could change her relationships with other characters as they might view her differently or she might have to struggle to control this new aspect of herself.
The 'sakura gets the curse mark fanfic' might focus on how Sakura's relationships change. Her friends could be worried about her. She may have to seek out ways to remove the curse mark, which could lead her on an adventure to find a cure. Along the way, she might discover secrets about the origin of the curse mark and its connection to some greater power in her world.
She might gain new and unpredictable powers. The curse mark could potentially enhance her strength in combat, like giving her more chakra or new jutsu abilities. However, it could also come with a price, such as being influenced by dark forces.
It could be Orochimaru. He is known for his experiments with curse marks, and he might see Hinata as an interesting subject to study or use for his own evil plans.
Well, without actually reading it, it could be about Naruko's journey after getting the curse mark. Maybe she has to struggle with the power it gives and the negative effects it has on her. She might face challenges from those who fear or want to use her new power.
Naruto is the central figure for sure. But in many fanfictions, characters like Jiraiya could be involved. Jiraiya, being Naruto's mentor in some ways, would want to study the curse mark and find a way to either remove it or help Naruto use it safely. Another character could be Orochimaru. Since he is associated with the curse mark in the original series, he might make an appearance, either as an antagonist trying to manipulate Naruto through the curse mark or as a source of information about it.
Obviously, Sakura and Sasuke are the main characters. Sakura is the one struggling, and Sasuke is the one whose grip is part of the situation, likely due to a curse.
Well, it could be about Hinata struggling with the new power and the negative effects of the curse mark. Maybe she has to learn to control it to avoid being consumed by its dark side.