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.
One idea could be that the twins have unique ghost powers that are different from Danny's. For example, one twin can manipulate time in the ghost zone while the other can create portals to different dimensions. This would lead to all sorts of adventures as they try to control their powers and use them for good.
First, develop interesting characters. Make the twins have distinct personalities. For example, one could be brave and impulsive while the other is more cautious and analytical. Then, create a tense and mysterious setting for the kidnapping. Maybe it's an abandoned warehouse on a stormy night. Also, build up the motivation of the kidnappers. Are they after ransom, revenge, or something else? This will keep readers engaged.
Bumblebee could also be a key savior. He's small but very brave and resourceful. He might be able to sneak into Megatron's lair undetected and find a way to free the twins. There's also a chance that some of the other Autobots like Ironhide or Ratchet could play important roles in the rescue. Ironhide with his tough exterior and powerful weapons could fight off Decepticon guards, while Ratchet could provide medical support if the twins were injured during the kidnapping or captivity.
If Charles Dance was the Phantom, he would bring a very different energy. He has a certain gravitas that could make the Phantom even more menacing and yet, at the same time, more alluring. His deep voice and commanding presence would make the Phantom's musical and passionate outbursts even more impactful.
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.
Once upon a time in Ninjago, the Time Twins emerged from a time rift. Acronix was the first to step out, his eyes glinting with mischief. His brother, Krux, followed more slowly, looking around warily. They immediately set their sights on the city, planning to disrupt the timeline for their own gain. The Ninja, led by Lloyd, had to quickly figure out a way to stop them. Using their elemental powers, they tried to fight the Time Twins, but the twins' time - based abilities made it a difficult battle.
They would likely raise them with a strong sense of honor and courage. Percy would teach them about the power of the sea and how to use it for good. Annabeth would instill in them a love for knowledge and strategy. They would also train their twins in combat skills to protect themselves in the dangerous world of demigods.
To develop the Carrow Twins, you could start by exploring their backstory. Maybe they had a difficult childhood that led them to follow Voldemort. For instance, if they grew up in a family that was always loyal to the Dark Lord, they might have been indoctrinated from a young age.