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.
Dork Diaries is a comic book because it uses illustrations and visual storytelling to convey the plot and characters' experiences. The combination of text and pictures makes it fall into the category of a comic book.