In a sense, it could be thought of as related to the idea of Ghost Rider fanfiction. Danny Phantom is about a boy who becomes a half - ghost and has to navigate a world of ghosts and other strange phenomena. This is somewhat similar to Ghost Rider's journey with his otherworldly powers. But Danny Phantom is an independent creation with its own lore. It has its own backstory for Danny's transformation, his relationships with other characters like his friends and family, and different antagonists. So while there may be some fanfiction - like connections, it stands on its own as a unique story.
The scariest part might be when Danny faces really powerful and malevolent ghosts. Their appearance can be quite terrifying, with dark auras and menacing looks.
One interesting story could be about Danny and Sam going on a ghost - hunting adventure together. They might discover a new type of ghost that has unique powers and they have to figure out how to defeat it using their combined skills.
In some fanfictions, Danny as the Ghost King discovers new powers that come with his title. For example, he might find out that he can open portals to different dimensions within the Ghost Zone. This could lead to all sorts of adventures. He could meet new types of ghosts or even encounter other beings that are neither human nor ghost. His relationships with his family and friends would also be affected. His parents, who were once ghost hunters, might have to come to terms with their son being the most powerful ghost in existence, and his friends would have to adjust to his new responsibilities and the potential danger that comes with it.
One interesting story could be about Danny exploring a new realm in the Ghost Zone that's never been seen before in the official show. It might involve him encountering unique ghosts with strange powers.
One great Danny Phantom Ghost Girl fanfiction could be 'The Ghostly Encounter'. It might focus on a unique relationship between Danny and the Ghost Girl, exploring their shared ghostly experiences in a new way. Another could be 'Ghost Girl's Secret', which delves into the hidden past of the Ghost Girl and how it intertwines with Danny's life. There are also those that play with the idea of the Ghost Girl having special powers that Danny has to discover.
One great Danny Phantom Ghost King fanfiction is 'The Reign of the Ghost King'. It delves deep into Danny's new role as the Ghost King, exploring how he balances his human life with his ghostly duties. The character development is really well - done in this fic.
For the crossover, a good plot could be that a new type of ghost appears that is immune to Danny's ghostly powers. The Ghost Hunt team, which has encountered a similar situation before, offers their expertise. They introduce Danny to a special type of ectoplasm - based weapon that can harm this new ghost. Danny then teaches them some of his combat moves as a half - ghost to better fight the ghost.
One idea could be that Danny, as a half - ghost, has to prove himself to the Ghost King. Maybe there's a tournament in the Ghost Zone where Danny enters to show his worth. This could lead to some epic battles and alliances with other ghosts.
In a lot of fanfictions, Danny himself often becomes the most powerful ghost. As he grows and learns to control his powers better, he can surpass many of the traditional powerful ghosts in the show. For example, in some fics, he gains the ability to absorb other ghosts' powers, making him extremely formidable.