Roz

Roz is a character in Monsters, Inc. and its prequel Monsters University. She is a grouchy brownish-yellow snail-like monster with a tuft of white and gray, pointed hair on the top of her head, wears a dark red jacket and black horn-rimmed glasses, and constantly frowning.

Monsters, Inc.
Roz is a slug-style monster in the movie who appears to be the key master and administrator for Scare Floor F, holding all the keys to children's closet doors at Monsters, Inc. She is responsible for all of the paperwork done by Mike Wazowski, and she often works at an office near Scare Floor F that can be separated from the rest of the factory via a retractable shutter. Roz slams the shutter shut on Mike's hands at one point, crushing them and causing him to scream in pain.

In the end of the film, it turns out that Roz is Agent #000001 of the CDA. She reveals that she was undercover for two and a half years at Monsters Inc. and that Mike and Sulley nearly ruined it all until when Boo came into their care. However, she does give credit for them exposing Henry J. Waternoose for corruption. She gives Mike and Sulley five minutes to return Boo back to her room before anything happens to her. After Boo's door is shredded, Roz says that this incident never happened and that she doesn't want to see any paperwork about Boo's invasion contrary to her requests earlier in the film.

She is not seen again for the rest of the film, but frequently appears in the film "outtakes." One example is when she unexpectedly pops out of the toilet and startles Sulley, who has opened the bathroom door to get Boo. Another is when the CDA agents surprisingly find her taking place of George Sanderson, after he gets his fur shaved off and is showered. The third is when Sulley tries to show Boo that the closet is empty, only to find it occupied by Roz saying "Guess who!" In all three outtakes, Roz makes her infamous laugh, "Ahh-haa-haa!" and sends others bursting into laughter.

Monsters University
Roz makes a quick cameo in Monsters University when Mike and Sulley are able to escape the human camp and are taken by the CDA. She is shown dressed up as a CDA agent with her uniform covering her entire body except for a transparent glass "dome" revealing her hair, but her size and voice still serve as a giveaway.

When Terri asks what's going to happen to them, Roz states that Dean Hardscrabble will decide that. But to rest assured, she then adds that they'll be watching them, "Always watching," foreshadowing M.I.

Personality
Roz is grumpy, especially to Mike Wazowski due that she is always bugging about paperwork.

Trivia

 * She is one of the few female characters voiced by a male, as Bob Peterson is male.
 * Roz bears some resemblance to Muriel Finster from the show Recess, since the two are both portrayed as elderly females that sport squinty eyes, horn-rimmed glasses and grouchy demeanors.
 * When director Dan Scanlon was talking about what characters we will see again in a preview for Monsters University, they showed Roz on the screen along with George Sanderson. This hinted that Roz would appear in the prequel, and she did.
 * Whenever Roz notices the CDA coming, she slams down the shutter separating her office from the rest of the factory to prevent everyone else from figuring out that she is really their leader.
 * Up until the end of the first film when the CDA arrests Waternoose after he and Sulley foil his evil plans and Roz revealing to them that she is their leader, Mike appears to be very afraid of her because she is "always watching them." This was likely because Mike and Sulley first met Roz when they were both expelled from Monsters University for sneaking off into the human world. After Roz reveals herself to be Agent 001, Mike isn't so afraid of her anymore.
 * Roz is very similar to the character of Star Wars Jabba Desilijic Tiure (or Jabba the Hutt), one Hutt, that is a creature from the extravagant colors like a giant snail hands with four fingers and a big greed.
 * Roz appeared at the beginning of the introductory video at The Science Behind Pixar along with Mr. Ray from Finding Nemo to greet the visitors and provide them with safety precautions. She also appears at the end of the video to inform the visitors that the video is over and says that she will miss them once they leave the theater.

Quotes

 * "Don't let it happen again."
 * "I'm watching you, Wazowski. Always watching. Always!"
 * "This office is now closed!"