One idea could be that Danny Phantom somehow gets transported to the Star Wars universe. Maybe he uses his ghost powers to help the Jedi or the Rebels. For example, his intangibility could be useful in sneaking past enemy defenses.
Another idea is a crossover where the Force in Star Wars has an effect on Danny's ghost powers. It could make his powers stronger or change their nature. He might have to learn to control these new aspects while also dealing with the threats in the Star Wars galaxy.
Another idea is a story about Danny and Star accidentally swapping powers. Danny has to deal with Star's magic while Star tries to control Danny's ghost abilities. It could be a comical yet challenging situation for both of them as they learn to adapt.
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.
One idea could be to have Danny Phantom's powers in the Star Wars universe. For example, he could use his intangibility to sneak past stormtroopers or his ghostly energy blasts as a new type of weapon. Maybe he gets caught in a wormhole and ends up in a galaxy far, far away and has to find his way back home while getting involved in the Galactic Civil War.
A more complex plot could be that there is a prophecy about a union between a half - ghost and a magical being like Star. Danny and Star initially don't believe it, but as they keep crossing paths and helping each other out, they start to see that there might be something more to it. However, there are forces that oppose this union, thinking it will disrupt the balance between the human world, the magical world, and the Ghost Zone. So they have to fight against these forces while also coming to terms with their own feelings.
One idea could be exploring Danny's relationships in a different way. For example, how his friendship with Sam and Tucker might develop if they faced a new supernatural threat. Another could be a story where Danny discovers a new power and has to learn to control it while dealing with school and his ghost - fighting duties. And perhaps a fanfiction where Danny travels to an alternate dimension within the Danny Phantom universe.
A great fanfiction idea could be a time - travel story within the Danny Phantom Phantom Planet universe. Danny somehow gets sent back in time to before he became a half - ghost. He has to figure out how to get back to his own time while also dealing with the knowledge he has of the future. This could lead to some really interesting interactions with his past self, his family, and friends. And he might accidentally change things in the past that could have a huge impact on the future of the Phantom Planet.
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.
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 exploring Danny's new role as a hero on a global scale. Maybe he has to deal with new threats that are attracted to his increased fame. Another could be delving into his relationships with his friends and family after the big events in Phantom Planet. For example, how does his relationship with Sam and Tucker change now that he's a more public hero?
Well, for Danny Phantom baby fanfiction, you could write about Danny having to babysit a baby that has the ability to see ghosts like he does. It would be full of comical moments as Danny tries to keep the baby calm while also dealing with ghosts. Or perhaps a story where Danny discovers a baby ghost in the Ghost Zone and decides to bring it back to the human world to protect it. You could also write a story where Danny's parents find a baby with strange energy readings and Danny has to keep his identity a secret while trying to figure out what's going on with the baby.