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.
Another plotline could involve jealousy among the members of the harem. Each character might have their own reasons for being attracted to Danny, and when they see him spending time with others in the harem, it could lead to some intense emotional moments. This can create a lot of drama and character development.
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.
One idea could be a fanfic where Danny discovers a new power that has unexpected consequences. For example, he might gain the ability to time - travel and has to deal with the chaos it causes in the timeline. Another idea is a fanfic that focuses on Danny's relationships in the ghost zone. Maybe he forms an alliance with a powerful but misunderstood ghost. A third idea could be a story where Danny has to go undercover as a human in a place full of ghosts who don't know he's half - ghost.
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.
In Danny Phantom x Harem fanfics, the different personalities in the harem are very appealing. Each character can bring something new to the story, whether it's their own powers or just their unique way of interacting with Danny. For example, one character might be really bold and adventurous, while another is more shy and reserved, creating an interesting mix of relationships. Also, the idea of Danny having to balance multiple relationships at once makes for some really engaging drama and character development.