One common theme is teamwork. Since it's about different characters uniting, stories often show how they work together. Another theme is the clash of different powers and abilities. Each Nicktoon character has their own unique set, and when they come together, it can create interesting situations.
There are some really great ones. Some fanfictions in this genre focus on bringing the different Nicktoons characters together in exciting adventures. They might explore how Danny Phantom interacts with other characters from the Nicktoons universe, like dealing with their unique powers and personalities. You can often find these by looking through the relevant tags on fanfiction platforms.
Definitely Danny's kids if he has any in the fanfiction universe. They could inherit his powers and have to learn how to use them while dealing with their own personal issues. Also, Sam and Tucker's children could be main characters. They might not have ghost powers but could be very tech - savvy and help in other ways, like creating new gadgets to fight ghosts.
A cool plot might be that the next - gen Danny Phantom characters face a situation where their powers are being slowly drained. They then have to go on a quest to find the source of this draining and stop it before they become completely powerless. It could involve meeting old enemies of Danny's who have new tricks up their sleeves.
There could be a character like Nova, a young girl who has the ability to phase through solid objects like a ghost but is human. She uses this power to help the new generation of ghost hunters.
Perhaps the new generation discovers a hidden realm in the Ghost Zone that was sealed off long ago. Inside, they find ancient powers and secrets that could either save or destroy the human - ghost balance. They have to make tough decisions on how to handle these newfound elements.
Perhaps Danny's friends find out that he has been caught by his parents. They could come to his rescue. Tucker might use his tech - savvy skills to hack into the Fenton's security systems, and Sam could try to reason with Danny's parents. Together, they could try to convince Danny's parents that Danny is still the same person they love, just with some extraordinary powers.
Well, the main character is Danny. Then there are his parents, Jack and Maddie Fenton. They could accidentally be the cause of Danny getting tied up if they mistake him for a more dangerous ghost. Jazz, Danny's sister, could also play a role. She might be the one to first notice Danny's disappearance and start looking for him. There could also be some new characters created specifically for the fanfiction, like a powerful new ghost that ties Danny up to prove a point.
Obviously Danny himself is still a very popular character. But in grown - up fanfiction, characters like Sam and Tucker also get more in - depth development. Sam might be involved in some kind of environmental or supernatural activism as an adult. Tucker could be using his tech skills in a big - time corporate or research setting related to the ghostly realm.
In this fanfiction, it could be that Danny Phantom meets a Danny Phantom from a parallel fan - made story. At first, they don't trust each other. But as they learn more about each other's worlds, they realize that there are some common elements that are being threatened. It could be that a powerful ghost is trying to rewrite all the fanfic universes related to Danny Phantom. So, they must combine their strengths and knowledge to stop this from happening.