Freddy himself is frightening, with a very limited dialogue and terrifying persona. In later sequels, he becomes a humourous villain, but in the first of the series is where we see Krueger at his menacing best.
For A Nightmare on Elm Street's Freddy Krueger, students hypothesized he represented Nightmare Disorder (ND), which is defined through repeated awakenings with [the] recollection of terrifying dreams usually involving threats to survival such as being hunted by a child murderer, according to a Psychology Today blog.
