Well, Danny is the main character who undergoes the change to Dark Dan. He is the focus as his new identity of Dark Dan is what creates the conflict and the story. Sam is also a main character. Since it's a Sam x Danny fanfiction, her relationship with Danny, whether it's romantic or just a deep friendship, is key. She will be the one to react to Danny's change and try to influence the situation.
In this fanfiction, Danny is the character at the heart of the story as he becomes Dark Dan. His transformation is the main event. Sam is another main character. Given the Sam x Danny aspect, she has an emotional connection to Danny. This connection will play a huge role in how she responds to Danny becoming Dark Dan. She might be the only one who can get through to him, or she could be in danger because of his new, darker self.
Well, in this fanfiction, it could be that Danny's change to Dark Dan is triggered by some extreme event. Sam, being in love with Danny, is determined to save him. She might face a lot of challenges like dealing with Dark Dan's new powers and his more malevolent personality. She could try to find a way to reverse the transformation by looking into ancient lore or seeking help from other characters who knew Danny before.
Obviously, Danny Phantom is the main character as it's about his transformation into Dan. His friends like Sam and Tucker would also be important characters. They would likely play a role in trying to either stop the transformation or help Danny deal with the consequences. And of course, his ghostly foes might also be involved, as they could either take advantage of his situation or be affected by the power shift if he becomes Dan.
Obviously, Danny Phantom and Dan Phantom are the main characters. Danny is the original form, a heroic character, and Dan is his more evil and powerful transformation.
One aspect of 'Dark Danny and Sam' fanfiction could be the exploration of the dark and complex relationship between the two characters. Dark Danny, with his corrupted nature, might have a very different dynamic with Sam compared to the regular Danny. It could involve themes of redemption, as Sam might try to bring back the good in Dark Danny.
The two main characters are Danny Phantom and Sam. Danny's transformation into an evil version of himself creates a complex dynamic. Sam, with her unique personality and her relationship with Danny, has to step up. She may be the only one who truly understands Danny enough to be able to combat his evil side. And depending on the fanfiction, other characters like Tucker or Jazz might also make appearances and contribute to the story in different ways.
The main characters would obviously be Danny and Sam. Danny, with his ghost - fighting abilities as Danny Phantom, is a key figure. He can fly, become invisible, and has super strength among other powers. Sam, on the other hand, is Danny's strong - willed and intelligent friend. She is often the voice of reason and also has a deep knowledge of the supernatural which helps in their adventures.
Besides Danny, the main characters could include some of the friendly ghosts from the Ghost Zone. They could be like Danny's support system in this new motherhood journey. Also, the school bully Dash might be in the story. He could start off making fun of Danny but then gradually come to understand and respect Danny's new role. And there could be a mysterious ghostly figure that either helps or hinders Danny in his newfound motherly duties.
Sam is also quite popular. Her goth - like personality and her strong - willed nature make her an interesting character. In fanfiction, she can be portrayed in different ways, like being even more involved in Danny's ghost - fighting activities.
There are a vast number of fanfics out there, and while the 'Danny x Sam' pairing is common in certain fandoms, it might be a bit difficult to find one with the 'Danny is tortured' aspect. You could also try reaching out to fan communities dedicated to the relevant series or characters. They might be able to point you in the right direction.
Danny's relationships change drastically. He distances himself from his friends and family. He no longer values their opinions or support. Instead, he might see them as obstacles or even threats. His friendships with Sam and Tucker are strained as he starts to engage in activities that they find morally wrong, like using excessive force on other ghosts or humans who get in his way.