Fear

Fear is one of the tetartagonists from the 2015 Pixar film Inside Out. He is one of the five emotions inside the mind of Riley Anderson. He appears to be unsure of himself, an emotion that matches his name. He is voiced by Bill Hader.

Background
Fear is one of the five emotions introduced after Joy. Fear is eventually somehow very nervous which is one of the reasons why his basis was based on frightening. Fear is eventually one of the five emotions of the headquarters inside Riley's mind, explaining about the internal core's memory orbs until later, all the orbs have fallen out.

Eventually, Anger, Disgust, and Fear went into a problem when Joy and Sadness are gone, frolicking in panic. When the headquarters are turning black and Sadness saved the day, Fear and the other emotions are adapting Riley for a new life prior to the end of the movie.

Besides Riley's Fear, there are many emotions that are minor versions of him. One is inside Mr. and Mrs. Anderson's emotions. Also in a cat at the end of the film, a purple cat (who is actually Fear) began controlling the real cat, making him scared of a dog at the end of the film.

Trivia

 * Bill Hader, voice of Fear, also did the voice of Flint Lockwood in the movie adaptation of Cloudy With a Chance of Meatballs.