Two-Dimensional Characters are also called as flat/static/minor characters. It is a minor character in a work of fiction who does not undergo substantial change or growth in the course of a story. It plays a supporting role to the main character. They are often necessary in a story, along with Main characters. Take, for example, Mr. Collins in Jane Austen's Pride and Prejudice. As flat character, he serves a vital role in the story of how Elizabeth and Darcy get together, and he provides comedy, but his character stays essentially unchanged. (In fact, that's part of what makes him funny.)