In Inside Out, Sadness’ (voiced by Phyllis Smith) blue appearance reflects how she feels inside, especially when Joy, Anger, Disgust, and Fear ostracize her for turning Riley’s happy memories into sad ones. Eventually they all learn how important Sadness is to Riley’s emotional well-being and accept her for who she is.
In Inside Out, Disgust (voiced by Mindy Kaling) acts to protect Riley from things or people that could potentially hurt her. Even though she may come across as opinionated and snobby, she has the best of intentions and her honesty only helps to protect Riley.
In Inside Out, Joy (voiced by Amy Poehler) is the leader of Riley’s emotions and does her best to keep Riley happy at all times even if that means keeping Sadness separated from all of her memories. Eventually Joy learns that not all of Riley’s problems can be solved by happiness and that sometimes sadness has a role in Riley’s life too.