Authors use onomatopoeia by incorporating words that imitate natural sounds or noise associated with an action or object. This literary device helps to engage readers in the story and creates a more vivid and realistic environment. For instance, in the comic book, the sound, "BOOM!" is used when a bomb goes off, and "SIZZLE" when something is frying. This sound effect provides a visual and auditory experience, making the story more captivating.