Sure, it is. Dork Diaries is in the realm of fiction. It weaves fictional tales that often involve the adventures and experiences of the main characters in a fictional setting.
It depends. Some parts of Dork Diaries can feel realistic, like the characters' emotions and school experiences. But there are also elements that might be a bit exaggerated for entertainment.
Self - discovery is also a big theme. In crossovers, Nikki often has to learn more about herself. For example, in a crossover with 'The Babysitters Club', she might discover new skills or aspects of her personality while babysitting. Also, the theme of adaptation is common. Whether it's adapting to a new school environment in a crossover with another school - based series or adapting to a completely different world like a magical one, it's something that comes up a lot in Dork Diaries crossover fanfiction.