A character (sometimes known as a fictional character) is a person or other being in a narrative.The character may be entirely fictional or based on a real-life person. Flat characters are two-dimensional, in that they are relatively uncomplicated. By contrast, round characters are complex figures with many different characteristics, that undergo development, sometimes sufficiently to surprise the reader. Dynamic characters are those that change over the course of the story, while static characters remain the same throughout.
A writer presents themes in a literary work through several means. A writer may express a theme through the feelings of his main character about the subject he has chosen to write about. Similarly, themes are presented through thoughts and conversations of different characters. Moreover, the experiences of the main character in the course of a literary work give us an idea about its theme. Finally, the actions and events taking place in a narrative are consequential in determining its theme. Major and minor themes are two types of themes that appear in literary works. A major theme is an idea that a writer repeats in his literary work, making it the most significant idea in the work. A minor theme, on the other hand, refers to an idea that appears in a work briefly, giving way to another minor theme. 

the most dominant function of humor is to provide surprise, which not only improves quality, but improves memorable style of a literary piece.