Sullivan, a blue furry monster, is the protagonist in the animated films Monster Company and monsters university, and also refers to toys made with prototype images in the market. Although he is good at scaring children at work, he is kind and considerate in nature.

It's a huge monster. It has blue fur, long hair with purple spots, two small horns on its head and a long tail. Speaking of horror, that's why the hairy monster was born-a big MAC-like figure, overwhelming roar, and a well-known family background of horror.

"Monster Company" is the biggest intimidation factory in the monster world. The monster that children fear most is James P Sullivan (voiced by john goodman). This huge monster has blue fur, huge purple spots and tentacles, and his friends call it Sulley. Sally's threatening assistant and his good friend and roommate, Billy Crystal (voiced by billy crystal), are a pale green one-eyed monster, aggressive and determined. Threatening children is not a simple matter. The monster thinks that children are poisonous, and direct contact will have disastrous consequences. Other carefully selected characters in the film include: factory owner Henry J. Walter Lu Jones (voiced by James coburn) who looks like a crab, receptionist Celia (voiced by Jennifer Furtilly) who has a snake head and loves to cheat, and Randall Boggs (voiced by Steve Buschemy) who likes to be sarcastic. An uninvited guest from the human world, a little girl named MaryGibbs, turned the monster company upside down.