| Boo Original name: Boo the girl; Mary; Human girl who visits Monstropolis |
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| Celia Mae Sulley's one-eyed girlfriend |
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| Henry J. Waternoose fat monster with lots of eyes and legs |
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| Mike Original name: Mike the monster; Michael Wazowski; sphere-shaped green monster with one eye |
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| Monsters Inc. | ||
| Randall Randall Boggs; purple monster who likes to disappear |
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| Roz Female monster wearing glasses. Has an unusual haircut |
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| Sulley James P. Sullivan; big, blue, and hairy monster with purple spots | |