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.
Well, in this kind of fanfiction, Danny could be controlled by an ectoplasmic parasite. The parasite latches onto Danny and takes over his actions. His eyes might glow a different color to show he's not in control. His friends would first be confused, then realize something is amiss and start investigating.
There could be a fanfic where Danny and Ember accidentally swap powers. This leads to a series of comical and also dangerous situations. Danny has to figure out how to control Ember's power of influencing people through music while Ember struggles with Danny's more combat - oriented powers. It could be a story full of self - discovery for both of them.
Another possibility is that he's facing some emotional turmoil. Danny has a lot on his plate. He has to keep his identity a secret from his friends and family, deal with school, and fight ghosts. All this stress could be causing him to lose his appetite. He might be too worried or preoccupied to even think about food.
Danny in the 'accused danny's story' could be a fictional character created for a specific narrative. Maybe it's a story written by someone to illustrate a point about false accusations or the justice system. On the other hand, he could also be a real person whose name has been used to tell a true story about an accusation situation, but we don't know his identity beyond the name given in this title.
One possible story could be that Danny is facing a new and extremely powerful ghost. He needs help from his friends Tucker and Sam. Maybe they need to find a rare artifact to defeat this ghost. They could start by researching in the local library, looking through old ghost lore books. Tucker uses his tech skills to try and track down any leads on the artifact's location, while Sam uses her knowledge of the occult.
In a Danny Phantom fanfiction about Danny being controlled, it might be due to an ancient ghost spell. Some evil ghosts find an old spellbook and use it on Danny. This could lead to Danny having to fight against the control from within himself. His friends, like Sam and Tucker, would then have to find a way to break the spell. They might search for a counter - spell in the Ghost Zone or consult other friendly ghosts for help.
In a fanfiction, Maddie could be working on a project that involves Lemon. Danny, being curious, sneaks in to check it out. This leads to a series of events where they all have to work together to solve a mystery. For example, the mystery could be about a strange energy source that is affecting the town and Lemon has some knowledge about it from her own experiences.
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 interesting fanfic concept is that Danny and Ember are forced to work together to save the Ghost Zone from a powerful, ancient evil. They must combine their powers and knowledge. Danny's scientific knowledge about the Ghost Zone and his powers, along with Ember's knowledge of the more mysterious and musical aspects of the Ghost Zone, could lead to a great adventure and a deepening of their relationship.