There could be a story where Danny Phantom discovers that Johnny 13 and Kitty are being controlled by an evil force. Danny then has to figure out how to break the control without harming them. It could involve a lot of detective work, like finding the source of the control and the motives behind it. Another idea is that Johnny 13 and Kitty want to change their 'bad guy' image and ask Danny for help. Danny is hesitant at first but then realizes that they might be sincere. So, he starts to train them to be more like 'good ghosts', which is full of humorous and touching moments as they struggle to adapt.
Well, a cool plot could be that Danny Phantom accidentally gets involved in a feud between Johnny 13 and Kitty. Maybe they blame Danny for something he didn't do, and he has to prove his innocence. Or perhaps there's a race in the Ghost Zone, and all three of them enter. Along the way, they face various obstacles and have to learn to cooperate despite their differences. Also, a story where they all get trapped in a different dimension and have to find their way back home while dealing with the strange creatures there.
One character that would be really interesting to pair with them is Ember. Her ability to control people through music could add a whole new layer of plot. Maybe she gets involved in a plot that affects Danny, Johnny 13 and Kitty, and they have to stop her. Another great character is Youngblood. His childish and mischievous nature could contrast with the more serious nature of some of the others. He could cause trouble that they all have to clean up together. And Clockwork, he could be a guiding figure, manipulating events from the background and making sure things don't go too far out of control when these characters interact.
One idea could be Danny Fenton having to deal with a new ghostly enemy that can manipulate time, making his double life as Danny Phantom even more chaotic. Another could be Danny trying to balance his high school life, including exams and relationships, while also facing a ghost invasion that only he as Danny Phantom can stop. Or perhaps a story where Danny Phantom discovers a hidden power within himself that has a connection to his human side, Danny Fenton.
One idea could be that Danny discovers a new ghostly power that he uses to take revenge on a group of bullies who have been tormenting his friends. He could use his intangibility in a creative way, like sneaking into their lockers and making their things disappear.
Maybe Danny's parents die in a ghost - related accident and he's left alone in the ghost zone. Kitty, having a soft spot for the young half - ghost, takes him in. She has to protect him from other ghosts who see Danny as a threat or a novelty. As Danny grows, he starts to question Kitty's more devious ways of dealing with problems in the ghost zone and tries to find his own path while still respecting her as his caretaker.
One idea could be that Danny gets an illness that affects his ghost powers. For example, he might start losing control over his intangibility or invisibility. This could lead to some really comical or dangerous situations. Another idea is that his friends try to find a cure for his strange ghost - related illness while also keeping it a secret from the town.
Well, perhaps in the fanfiction, Undergrowth could create a parallel dimension filled with his overgrown plants and trap Danny there. Danny then has to navigate this strange new world, make allies among the plant - like creatures that are also being oppressed by Undergrowth, and find a way to break out and stop Undergrowth from spreading to the real world. This would be an exciting adventure full of mystery and discovery for Danny.
Maybe in the fanfiction, Danny's mom accidentally gets transported to the Ghost Zone and Danny has to go on a wild adventure to rescue her. Along the way, he discovers new things about his powers and his family's connection to the Ghost Zone. This could lead to some really emotional moments between Danny and his mom as they reunite and face new challenges together.
Well, a great plot for Danny Phantom Planet fanfiction could be about Danny's life after saving the planet. He might face new challenges like dealing with the fame that comes with being a hero. Some people could idolize him while others might be jealous or even fear him. You could also write about Danny trying to balance his normal life with his superhero duties on a more global scale. He could have to travel around the world to solve problems related to the changes that occurred during the Planet event.
Well, here's a plot. In a strange turn of events, Danny's ghost powers start to interact with alicorn magic in unexpected ways. This causes chaos in both worlds. The alicorn and Danny must work together to figure out how to stop the strange energy fluctuations. They might have to travel to different dimensions within their universes to find a solution. Along the way, they meet other characters from both franchises who either help or hinder their progress.
One idea could be that the twin has a different set of powers. For example, while Danny can go intangible and invisible, the twin might have the power to control time on a small scale. This would create interesting scenarios where they have to work together, like when Danny is in a tough fight and the twin uses time - control to give him an edge.