Jazz, Danny's sister, can also be involved. She might show maternal - like behavior towards Danny, especially when she realizes the unique challenges he faces as a half - ghost. It could be like she takes on a more protective and nurturing role, similar to a mother would.
Danny himself can be a main character in such fanfiction. His relationship with his mother, Maddie, can be explored from the perspective of maternal instincts. For example, Maddie's instincts kicking in when Danny is in a particularly dangerous situation with his ghostly foes.
Well, one idea could be exploring how a female ghost in the Danny Phantom world discovers her new - found maternal instincts towards a lost or abandoned ghost child. Maybe she starts to protect it from other malevolent spirits.
Tucker Foley and Sam Manson are also often main characters. They are Danny's best friends in both his human and ghost - fighting life, so they play important roles in many fanfictions. They might be helping Danny deal with the challenges of his dual identity or getting involved in his battles against ghosts.
There could be some ghost characters involved too. For instance, Vlad Masters might show up in the fanfiction. He could be either jealous of Danny's new ability with the claws or try to use it to his own advantage. Another character could be Skulker. He might see Danny's claws as a new trophy to hunt for, which would lead to some exciting chase scenes in the fanfiction.
In addition to Danny and his immediate circle, there could be other characters from the Danny Phantom universe. For example, Valerie Gray. If she discovers Danny's identity, she might have a complex reaction. On one hand, she's been hunting ghosts, but on the other, Danny has also been protecting the town. So, her role in the fanfiction could be very interesting, especially in terms of how she interacts with Danny after the identity reveal.
The main character is Danny Phantom himself. He's at the center of the story as he discovers and wields the secret weapons. Then there's Vlad Masters. He could be a key character in some fanfictions as he might be after the same secret weapons as Danny, either to use them for his own gain or to stop Danny from having them. Danny's parents also play a role, as their ghost - hunting knowledge and equipment could be related to the secret weapons in some way.
In some fanfictions, Danny's family members can be involved as well. His sister Jazz might be there to support him emotionally or to try and stop him from making a dangerous sacrifice. His parents, who are ghost hunters, could also be part of the story. Their relationship with Danny and their views on his actions can add depth to the fanfiction.
In Danny Phantom fanfiction, the exploration of maternal instinct can add depth to the story. For example, a mother figure might show her instinct by being overly protective of Danny. This could be in the face of his ghost - fighting adventures, where she senses the danger he's in even when he tries to hide it.
There could also be original characters created specifically for the fanfiction. For instance, a ghostly doctor who specializes in the unique circumstances of a half - ghost pregnancy. Or a new human friend who discovers Danny's situation by accident and has to decide whether to keep the secret or not. These characters can add new twists and turns to the story in the fanfiction.
Obviously, Danny Phantom himself is the central character. His two identities, Danny Fenton the human and Danny Phantom the ghost, are at the core of the identity crisis. His friends Sam and Tucker are also often involved. They are usually the ones who are either helping Danny through his crisis or are unknowingly part of the problem, like when they start to suspect something strange about Danny.
In this type of fanfiction, Danny is the main focus as he endures the sensory overload. Sam and Tucker are key characters as they are Danny's support system. But there could also be appearances from some of the ghost villains like Vlad Masters. He might either be trying to use Danny's overload to his advantage or might be an unexpected ally in helping Danny understand and control his condition. And of course, Danny's family members, especially Jazz, could play important roles in the story.