" she could to help Riley live a happy life. She thought it would just be her and Riley forever…But thirty-three seconds after Riley was born, someone else materialized at the console and started working the controls. Riley began to cry. “I’m Sadness,” the blue newcomer said to Joy, introducing herself somberly. “I just want to fix that,” Joy said, gently pushing Sadness off the controls. She pressed a few buttons and Riley stopped crying. As time went on, more Emotions showed up inside Headquarters, taking control whenever Riley needed them. And with each new Emotion, memories started rolling through in different colors, matching the Emotion that Riley felt about the memory. Fear’s job was to keep Riley safe. He guided her whenever she encountered something he "
― , Inside Out: The Junior Novelization (Disney/Pixar Inside Out)