One reason in fanfiction for Danny Phantom hating Christmas could be that it reminds him of what he can't have. He's a half - ghost, and Christmas is a very human - centric holiday. He might feel left out of the normal family traditions and celebrations. The bright lights and happy families might make him feel more isolated in his unique situation, which in turn causes him to dislike the holiday.
In fanfiction, Danny Phantom could hate Christmas due to personal reasons related to his double life. Maybe he has had bad experiences during past Christmases. For example, he might have been unable to fully enjoy the holiday because he had to deal with a major ghost threat right in the middle of Christmas dinner. Or perhaps he's jealous of how normal people get to celebrate without the added stress of being a half - ghost.
In the fanfiction, the fem Danny Phantom might hate Christmas because it represents a time when she feels most different. If she's a half - ghost, Christmas might be a time when she's acutely aware of not fitting in with either the human or the ghost world. All the normal human traditions and the special 'ghostly' events during Christmas might make her feel isolated. For example, humans are busy with their family dinners and gift - giving, while ghosts might have their own spooky celebrations. She, being in between, has nowhere to belong during this time, thus leading to her hatred for Christmas.
In some fanfictions, Danny Phantom may hate his parents because they are constantly trying to hunt him down. His parents are ghost hunters and they don't know that Danny is actually half - ghost. So their actions of trying to capture and study ghosts put Danny in a dangerous and uncomfortable position, which could lead to feelings of hatred.
In some fanfiction, the writers might be exploring a darker version of Danny Phantom. His hatred for Amity Park could stem from feeling trapped there. He has all these ghost - fighting responsibilities in Amity Park, and he might just be sick of it. He could be longing for a normal life away from the constant chaos and danger that the town represents to him.
Well, it could be that Danny is really into the Danny Phantom world and reading fanfiction about it is like a form of 'feeding' his love for the series. Maybe he finds new and exciting ideas in the fanfiction that he can't get from just the original show.
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.
It could be that the cultural aspects of Christmas don't resonate with Naruto's character in the fanfiction. He comes from a different cultural background in the Naruto world, and the whole idea of Christmas - the gift - giving, the Santa Claus, etc. might seem strange and unappealing to him. So, the writer of the fanfiction might have decided to make him hate it for that reason.
It might be that the people in Amity Park don't fully understand him. They might be scared of him or misjudge his actions, which could lead to Danny hating the place. For instance, if they blame him for some damages that were actually caused by the ghosts he was fighting.
The world of Danny Phantom is full of possibilities for fanfiction. Dani, being Danny's clone, adds another layer of complexity. Writers can create stories about their shared powers, their different outlooks on being half - ghosts, and how they interact with the other characters in the Danny Phantom universe. Also, their adventures in the Ghost Zone provide a lot of material for exciting fanfiction stories. For example, they could go on a quest together, or face a new and dangerous ghost that forces them to rely on each other.
In some fanfictions, Danny's mom might find out when she accidentally witnesses Danny transforming into his ghost form. Maybe she walks in on him at a crucial moment.
Yes, there are some. You can usually find them on fanfiction websites. Just search for 'Fem Danny Phantom Hates Christmas' on popular fanfic platforms.