Chuckles was the AI responsible for running the life support of Ardor and cataloging the lives of the settlement's inhabitants. He was one of the few AI units designed by Binary to remain fully functional well into the Fourth Era. It was commissioned by Pinkie Pie and the Department of Joy.
When encountered by Lozenge, he remains affable and provides her with status reports as she enters. He informs her she will be able to enter and exit as she pleases, but that none of the "subjects" will be permitted to leave the facility. He provides an additional report to Syntax regarding Ardor's food supply.
Chamberlain eventually shuts Chuckles down, exposing the truth of the facility to the inhabitants.