Well, in some fanfictions, Danny's claws might be a key factor in him exploring a hidden part of the Ghost Zone. He could use them to climb or dig through strange substances there. It could also lead to him finding new allies or enemies. For example, there might be a race of ghosts that are both intrigued and threatened by his clawed form.
In certain Danny Phantom has claws fanfiction, the claws could symbolize a new stage in Danny's development as a half - ghost. He might struggle with controlling their power at first. There could be a story where he accidentally hurts someone with his claws and has to learn to master them. This could involve training with Frostbite or another of his ghostly friends. The fanfiction might explore how his relationships change as a result of having this new and somewhat dangerous feature.
There could be some ghost characters involved too. For instance, Vlad Masters might show up in the fanfiction. He could be either jealous of Danny's new ability with the claws or try to use it to his own advantage. Another character could be Skulker. He might see Danny's claws as a new trophy to hunt for, which would lead to some exciting chase scenes in the fanfiction.
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 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.
Another type of interesting fanfiction in the Danny Phantom universe might be those that delve into his relationships. It could be his friendship with Sam and Tucker taken to new levels. Maybe they go on an adventure together that tests their friendship in ways not seen in the original series. For instance, they might have to make a difficult choice between saving Danny's secret identity or saving the town from a new ghost threat.
One idea could be that Danny gets an illness that affects his ghost powers. For example, he might start losing control over his intangibility or invisibility. This could lead to some really comical or dangerous situations. Another idea is that his friends try to find a cure for his strange ghost - related illness while also keeping it a secret from the town.
One interesting storyline could be Paulina finally realizing Danny Phantom and Danny Fenton are the same person. She could initially be shocked but then come to accept it and they team up to fight a new powerful ghost. It would add a whole new dynamic to their relationship.
One idea could be exploring Danny's relationships in a different way. For example, how his friendship with Sam and Tucker might develop if they faced a new supernatural threat. Another could be a story where Danny discovers a new power and has to learn to control it while dealing with school and his ghost - fighting duties. And perhaps a fanfiction where Danny travels to an alternate dimension within the Danny Phantom universe.
One interesting danny phantom lemon fanfiction could be about Danny's new ghostly power discovery within the context of a unique adventure. Maybe he uses it to save his friends in a very unexpected way.
One interesting story could be about Danny's transformation in a unique and unexpected way. For example, he might transform into a different form that gives him new powers and challenges him to adapt. Maybe he turns into a form that is more animal - like and has to learn to control his new instincts while still fighting ghosts.
One interesting story could be about an FTM Danny Phantom dealing with his new identity while still having to fight ghosts. Maybe he uses his powers in unique ways that are related to his transgender experience, like using his transformation abilities as a metaphor for his own transition.