What is the name of the child in the opening simulation at Pixar’s Monsters, Inc.?

The child in the opening simulation of Pixar’s Monsters, Inc. is named Thaddeus Bile.

The film begins with a training exercise on a simulated bedroom set. A scarer practices frightening a child mannequin while supervisors evaluate the performance. The simulation introduces the company’s workplace procedures and establishes that scarers are expected to avoid contact with human objects because monsters believe such contact is dangerous.

Thaddeus Bile is the name displayed for the simulated child target in this opening sequence. He is not Boo, the real human child whose accidental arrival drives the main story. That distinction matters because the opening scene is a staged test rather than an actual visit to a human bedroom.

George Sanderson is a real monster employee who becomes involved in the famous sock decontamination incident. Tony Freaks is another scarer seen in the company setting, making those names plausible but incorrect alternatives.