Joy is the protagonist of Inside Out. She is the yellow Emotion and the main Emotion out of the five that live inside the mind of Riley, the others being Fear, Anger, Disgust andSadness. She appears to be happy all the time and full of energy.
"Joy’s goal has always been to make sure Riley stays happy. She is lighthearted, optimistic and determined to find the fun in every situation. Joy sees challenges in Riley’s life as opportunities, and the less happy moments as hiccups on the way back to something great. As long as Riley is happy, so is Joy."[2]