Well, obviously Danny Phantom himself. He is the central character as the story likely revolves around his experiences at school and the revelations that occur there. Then there's Sam and Tucker, his best friends. They are always there to support Danny, whether it's helping him keep his secret or getting involved in the ghost - related adventures that often spill over into the school environment.
One interesting plotline could be Danny's secret identity being revealed at school in a very unexpected way, like during a science experiment gone wrong. Maybe the ectoplasm reacts with something and his powers are exposed in front of the whole class.
In addition to the ghosts, there might be some human characters that are important in the 'phantom city danny phantom fanfiction'. They could be Danny's friends or family members who get involved in the events of the Phantom City. Their reactions to the supernatural world and their interactions with Danny and the ghosts would add an interesting dynamic to the story.
Obviously Danny himself is very popular. He's the main character and the source of most of the action and drama. His two best friends, Tucker and Sam, are also often featured prominently. They provide support and comic relief in many fanfictions.
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.
Well, obviously Danny Phantom and Shego are the main characters. Danny is a half - ghost hero with powers like intangibility and flight. He's usually trying to protect his town from various ghostly threats. Shego, on the other hand, is a tough villainess from the Kim Possible universe. She has green energy - based powers and is known for her sarcastic and feisty personality.
Sometimes, there are original characters in these fanfictions. For example, a merman elder who guides Danny in the underwater world. This character can introduce Danny to the rules and culture of the merman society. Another could be an underwater villain who wants to use Danny's powers for their own evil purposes, adding conflict to the story.
In many Danny Phantom sword fanfictions, Danny is front and center. He's the one who discovers the sword, whether it's in the Ghost Zone or some hidden place in Amity Park. Jazz, his sister, could also play a role. She might be skeptical at first but then get involved when she realizes the sword's significance. And there could be an antagonist, perhaps a powerful ghost who wants the sword for its own evil purposes.
Obviously, Danny Phantom and Spectra are the main ones. Danny, the half - ghost hero, and Spectra, the ghost who feeds on emotions.
Well, clearly Danny Phantom is likely to be one of the main characters. And since it's about devils, there must be some devil characters as well. Maybe there's a lead devil character that Danny has to face off against.
Well, obviously the twins would be main characters. They could be named something like Jake and Jill. Danny himself would also be a main character as he would likely be involved in their story, either as a mentor or a friend. Then there could be other recurring characters from the original Danny Phantom series like Sam and Tucker, who might help the twins adjust to their new situation.