Cliff is Teacher's close friend, who he met in College. He works as a doctor in the town nearby where the Care Facility is located and helps Teacher search for possible candidates for the Nightmare Syndrome. Occasionally, he'll take the time to visit him and the children.
Cliff has brown hair and brown eyes. From miscellaneous art of him, he wears a yellow sweater with a jagged line and pointed shapes running across his chest and a white coat presumably from his job as a doctor. Could be assumed that he wears dark pants and shoes when looking at his overworld sprite.
Although he does not play a direct role towards the events of the game, he has contributed greatly behind the scenes which is greatly described within the novel.
- You're capable of calling him in the Good Night/Recipient of Love ending after waking up from the dream. You can do this by inspecting Teacher's desk for Cliff's phone number, then going to the foyer and interacting with the phone.