Having given monsters James P. “Sulley” Sullivan and Mike Wazowski the most prestigious job in Monstropolis—Scarer—the filmmakers needed to find the right kid to scare. The character of Boo only emerged after several story changes. “Ultimately we needed the kid to be as cute and appealing as it gets, and we decided it’s hard to beat a two-year-old girl for that,” explains Director Pete Docter.
James P. “Sulley” Sullivan
James P. “Sulley” Sullivan may be the most celebrated Scarer in Monstropolis, but that doesn't make him mean. When the softhearted monster has to care for Boo, he discovers that love and laughter are more powerful than making kids scream.
Sulley's scare assistant, best friend, and roommate doesn't want any interruptions in his life—especially in his relationships. Although Mike thinks Boo is a "killing machine" at first, he later finds she's a great audience for his natural comedic talent.
Boo has a vocabulary of about three words, but that doesn't stop this curious human girl from stealing Sulley's heart and overcoming her fear of Randall.
Able to scare even his co-workers with his chameleon abilities, Randall is one of the most wicked monsters in Monstropolis. His plan to capture the all-time scare record only scratches the surface of his sinister agenda.
Henry J. Waternoose III
Monsters, Inc. has been in the Waternoose family for generations, and Henry J. Waternoose III will do anything to beat the scream shortage and make his company profitable again.
Dispatch Manager Roz may be slow moving and slow talking, but the quick-witted slug has her eye on everything—including Mike Wazowski’s lack of paperwork. She's a No. 1 nut in Mike's book and a No. 1 boss to others.
The factory's one-eyed, snake-haired receptionist must put her birthday celebration on hold as she gets caught in the middle of Sulley and Mike's crazy predicament. Luckily, her love for Mike prevails and she comes to his rescue.
Known as the Abominable Snowman to humans, this banished monster spends his time in the cold Himalayas making lemon-flavored snow cones.
This easygoing monster has the worst of luck, coming into contact with human items and attracting the attention of the Child Detection Agency (CDA), no thanks to his tattletale Scare assistant.
Research had played a key role in previous Pixar films; the creative team had toured toy stores for Toy Story and crawled around with insects for A Bug’s Life. But monsters did not lend themselves to scrutiny. A trip to the public library was largely unproductive.
Interviews with kids revealed that while they believed in monsters, they were hazy on the details. The filmmakers finally decided to unleash artists and illustrators to create monsters from their own imagination. “Given the choice between serious study and making it up….we decided to just make it up,” says Pete Docter.