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 plotline could be Danny having to deal with an ancient ghostly prophecy as the Ghost King. For example, he might be the key to preventing a great disaster in the Ghost Zone or the human world.
One interesting plot could be Danny facing a new, extremely powerful ghost in the Ghost Zone who challenges his title as the King. This ghost might have unique powers that Danny has to figure out how to overcome.
One idea could be Danny having to deal with the political intrigue among the ghosts as the Ghost King. He might have to form alliances with different ghost factions to maintain peace in the Ghost Zone.
One idea could be Danny having to deal with new political intrigues in the Ghost Zone as the king. For example, different ghost tribes trying to gain his favor or plot against him.
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 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.
One interesting story could be about Paulina realizing Danny's half - ghost nature in a very unexpected way, like during a school play when his powers accidentally go haywire. Another might involve Paulina getting some of Danny's ghost powers transferred to her temporarily and having to deal with the newfound abilities.
One interesting Danny and Dani fanfiction could be about them teaming up to fight a new and powerful ghost. They use their combined powers and unique abilities to outwit the enemy. For example, Dani might use her speed while Danny uses his more powerful ghost ray.
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.
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.