There could be a group of ghost students from a different part of the Ghost Zone. They might have different abilities and cultures compared to the ghosts Danny usually encounters. This could lead to some interesting interactions and misunderstandings between them and Danny's class.
One idea could be that during the field trip, Danny discovers a new type of ghost that has powers he's never seen before. This ghost could be friendly at first but then turn out to have a hidden agenda that endangers the whole class.
The main characters are Danny and Ember. Danny is a half - ghost with powers to fight ghosts and protect the human world. Ember is a ghost with the ability to use music as a weapon and influence others with her tunes.
One great Danny Phantom field trip fanfiction is 'The Haunted Museum Field Trip'. It has a really interesting plot where Danny and his classmates go on a field trip to a spooky museum. Another good one is 'Field Trip to the Ghost Zone'. It takes the concept of a field trip and twists it into an adventure in the Ghost Zone. There are also some on fanfiction.net that are worth checking out.
A plot might involve Danny and Ember being on this field trip and stumbling upon a mysterious area in the Ghost Zone. This area has some sort of power that starts to affect them in strange ways. They need to figure out how to stop the power from causing chaos in the Ghost Zone and also in their own lives. As they do this, they discover new things about each other's pasts.
One possible fanfiction could be Danny Phantom going on a field trip to Gotham City where he accidentally stumbles upon the Bat family during one of their crime - fighting escapades. Maybe he uses his ghost powers to help them out in a tricky situation, and they are initially suspicious but then become intrigued by his abilities.
The fanfiction where Danny's class goes on a field trip to a floating island in the sky that's full of ancient ghostly artifacts is quite creative. The author creates a whole new world up there with its own rules and mysteries. Also, there's a story where the field trip is to a place that can make people's worst nightmares come true. Danny has to use his ghost powers in new and unexpected ways to protect his classmates. It's very creative in how it plays with fear and the power of the mind.
During the field trip, if there's a supernatural event, Danny's powers would be useful. The Bat family, with their detective skills, would notice Danny's unique abilities. They could start working together, like Danny using his ghost ray to stun enemies while the Bat family takes them down physically. Danny might also share some of his knowledge about the ghost zone with the Bat family, which could help them in future cases involving the supernatural.
Potential characters could include powerful ghost lords that Danny has to deal with. These could be ancient and very powerful ghosts who see Danny as a threat or an opportunity. There might also be some half - ghost characters like Danny, but with different origins. They could be his allies or enemies. And let's not forget the minor ghosts that populate the Ghost Zone, they could add flavor to the story, either by helping Danny or causing trouble for him.
A fanfiction with Danny Phantom raised in the Ghost Zone could explore his character development in a whole new light. Since he was raised there, he may not have the same sense of human morality. He might see humans as outsiders or even threats. His appearance could also be different, maybe more ghost - like. His friends and family in the human world would be strangers to him, and the story could be about him either rediscovering his human side or fully embracing his ghostly nature.