A popular storyline is Danny's discovery of his powers. It's exciting to see how he initially reacts to being able to turn intangible and invisible. He doesn't quite know how to control it and there are a lot of comical moments as he tries to figure it out.
There is also the storyline where Danny travels to the Ghost Zone to find something important. In the Ghost Zone, he encounters all kinds of strange and unique ghosts and has to navigate through this otherworldly place while facing many challenges.
One common storyline is Danny's relationships with different ghostly female characters evolving in a romantic way. For example, he might have to balance his feelings for a powerful ghost princess and a mischievous ghost girl. Another could be the harem members teaming up to protect Danny from a greater threat, while also dealing with their own jealousy and competition within the harem.
The different types of ghosts and their unique abilities and backstories add a lot of depth to the show. For example, there are ghosts with powers over time, space, and emotions, and Danny has to figure out how to defeat each of them, which often involves a lot of strategic thinking and using his own powers in creative ways.
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 possible storyline could be that Sam is influenced by a new, mysterious character in town. This character might be using some sort of mind - control or persuasion power on Sam, making her act out of character and cheat on Danny. Another idea is that Sam and Danny have a big fight over Danny's ghost - hunting duties. Sam feels neglected and in a moment of weakness, she might get involved with someone else.
One possible storyline could be that Danny is pushed to the edge by constant bullying at school and the stress of hiding his ghost powers. This leads him to gradually embrace the darker side of his powers and become Dark Danny. For example, Dash's continuous taunts and the school's overall negative attitude towards him make him lose faith in humanity.
One possible storyline could be Danny facing a new, more powerful ghost while also dealing with his regular high - school drama. In this fanfiction, the Dash x Danny aspect might add a layer of unexpected friendship or rivalry as Dash discovers Danny's secret identity and has to decide whether to support or expose him.
One popular 'Danny Phantom Danny Dies' fanfiction might be 'The Aftermath'. In this type of fanfiction, the story often explores how the other characters deal with Danny's death. For example, Sam and Tucker may go through a period of extreme grief and guilt, wondering if they could have done something to prevent it. Another could be 'A World Without Danny', where the entire Amity Park starts to change in unexpected ways due to Danny's absence, showing how much of an impact he had on the town.
A great storyline might be a crossover where Danny and Robin end up in each other's universes. Danny has to deal with the more crime - filled Gotham while Robin has to handle the ghostly threats in Amity Park. This would lead to a lot of character development as they adapt to new situations.
One interesting storyline could be where Danny and Vlad are forced to team up against a common enemy. Maybe a powerful ghost that threatens both their existences. This would put their rivalry on hold and force them to use their combined powers.
One possible storyline could be that Danny sacrifices himself to save the world from a powerful and evil ghost. Maybe he uses all his energy in a final battle and fades away, leaving his friends and family to mourn. Another could be that he's tricked by a villain into a death - trap that he can't escape from.