A plot might be that Danny is kidnapped by a powerful ghost from another dimension. This ghost believes Danny is the key to opening a portal that will allow his kind to invade Danny's world. So, he keeps Danny in a ghostly prison, guarded by his minions. Danny has to figure out a way to escape and close the portal before it's too late. Also, it could be that Danny is kidnapped by a fanatical ghost hunter who thinks Danny is a dangerous ghost and wants to study him in isolation, not realizing he's half - human.
One possible plot could be that Danny is kidnapped by a new ghost enemy who wants to use his powers for their own evil deeds. Maybe this enemy plans to drain Danny's ghostly energy to become more powerful. Another plot could involve Danny being kidnapped by a group of his human enemies who have finally discovered his secret identity and want to experiment on him. Or perhaps a time - traveling villain kidnaps Danny to prevent him from ever becoming a hero in the future.
Well, in some fanfictions, Danny could be kidnapped by a vengeful spirit who blames Danny for something that happened in the past. This spirit takes Danny to a haunted realm where he has to face his worst nightmares to break free. Another idea is that Danny is kidnapped by a group of his classmates who are under the influence of a mind - controlling ghost. They take him to an abandoned place, and Danny has to find a way to break the mind control and escape without harming his friends.
One possible plot could be that Danny's sneeze accidentally activates a new ghost power. For example, every time he sneezes, he temporarily gains the ability to phase through different dimensions. This could lead to all sorts of adventures as he tries to control this new and unexpected power while also dealing with his regular ghost - fighting duties.
Maybe Danny and a ghost enemy are stuck together due to some strange ghostly spell. This forces them to understand each other better as they try to break the spell. As they are stuck, they start to see the other's point of view, which could lead to an unexpected friendship or at least a truce.
One possible plot could be that the evil Danny Phantom tries to manipulate Sam into helping him take over the Ghost Zone. He might use his powers to deceive her at first, but Sam gradually realizes his true intentions and has to find a way to stop him.
Well, one interesting plot could be Danny finally revealing his secret to his best friend Tucker in a really dramatic way. Maybe it's during a ghost attack and he has no other choice but to show his powers to save Tucker. Another plot might involve Danny's parents finding out his secret through some accidental discovery in their own ghost - hunting experiments.
Well, in some 'Danny Phantom Adopted by Ghosts Fanfiction', a possible plot is Danny forming unexpected alliances with other ghostly beings as a result of his adoption. He could team up with some outcast ghosts to fight against the more malevolent ones. Also, his adoption might lead to a series of adventures where he explores different ghost realms that were previously unknown to him. It could be really exciting as he discovers new landscapes, creatures, and mysteries in these realms. And perhaps, there is a plot where Danny has to prove himself worthy of his new ghost family in the face of some ancient ghostly trials.
In a more emotional plot, Danny has lost his family in some ghost - related incident and is all alone. Batman, seeing a kindred spirit in Danny (both having experienced loss), decides to adopt him. Danny then has to adjust to living in the Batcave and being part of Batman's crime - fighting family. He struggles with fitting in at first but eventually finds his place and becomes an important asset to the team, using his powers in ways Batman hadn't thought of before.
There could be. The Danny Phantom fandom is quite creative. Some writers might explore the idea of Maddie being kidnapped to add drama and tension to the story. It could lead to all sorts of interesting plot developments, like Danny having to use his powers in new ways to rescue her or uncovering secrets about his family in the process.
In some Danny Phantom harem fanfics, a common plot is Danny accidentally creating a harem situation. Maybe he saves a group of girls from a ghost attack and they all become infatuated with him. Then he has to balance his normal life, his ghost - fighting duties, and his new relationships with these girls. It can lead to a lot of comical and heart - warming moments as he tries to understand their feelings and his own.
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.
Well, one interesting plot could be how Danny's friends react to his identity. Some might be shocked at first but then become more supportive. Another could be how his enemies use this new knowledge against him, leading to intense battles.