James P. Sullivan, also known as 'Sulley', is the lovable and large protagonist of Disney-Pixar's animated film 'Monsters, Inc.' Sulley is a top scarer at the Monsters, Inc. factory, where his job is to scare children to generate energy for the monster world. Despite his fearsome appearance, Sulley is kind-hearted and compassionate. Throughout the film, he forms a strong bond with a human child named Boo and eventually helps to revolutionize the way monsters generate energy by using laughter instead of screams. Sulley's character embodies themes of friendship, courage, and change.