In some fanfiction, it could be that an outside force, like a powerful ghost, is trying to break up Danny and Sam. The ghost targets Sam and makes her believe that Danny is in danger because of their relationship. So, to protect Danny, she distances herself from him and ends up getting involved with someone else, which Danny sees as cheating. There could also be a misunderstanding where Sam is framed for cheating, but in reality, she's innocent.
Perhaps Sam cheats on Danny because she discovers a secret about Danny that she can't handle. For example, if she finds out that Danny has a hidden power or a connection to the ghost world that he has been keeping from her. She could then turn to someone else for comfort, thinking that Danny has been dishonest with her all along. It could also be that Sam is just exploring a different side of herself and gets carried away in a relationship with a new person.
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.
Danny would probably be heartbroken. He really cares about Sam, so finding out she cheated would be a huge blow. He might go into a state of denial at first, not wanting to believe it.
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 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.
Another storyline could be a 'what - if' scenario. For example, what if Sam was the one who got the ghost powers instead of Danny? This would completely change their dynamic. Sam might be more impulsive with her powers, and Danny would have to be the one to keep her in check. It could lead to a lot of interesting character development and new relationships within the story.
One idea could be that Danny and Sam have kids in the future and their kids inherit Danny's ghost powers. The story could focus on how they learn to control their powers while also dealing with normal kid stuff like school and making friends. It would be interesting to see how Sam, as a mom, guides them through this.
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.
Love and friendship are common themes. Their relationship, whether it's a budding romance or a deep platonic bond, is often explored.
Characteristics of great Danny Phantom Sam and Danny fanfiction include a deep understanding of the source material. The writer needs to know the lore of Danny Phantom and how Sam and Danny fit into it. A strong emotional core is also important. Whether it's the friendship, love, or loyalty between Sam and Danny, it should be palpable. Moreover, creativity plays a role. It could be in the form of new ghostly enemies they face together, or unique settings within the Danny Phantom universe. And of course, the fanfiction should be able to hold the reader's attention from start to finish with an engaging storyline and well - crafted scenes.
One possible scenario could be that Sam betrays Danny's secret identity to someone he doesn't trust, like a ghost hunter. Maybe she does it out of jealousy if Danny starts getting closer to another character.
Some fanfictions might explore the idea that Sam's long hair is a symbol of a prophecy. It's predicted that a girl with long hair will bring balance to the world of humans and ghosts. Sam, with her long hair, then embarks on a journey with Danny to fulfill this prophecy. Along the way, they face many challenges and their relationship deepens as they work towards this common goal.