Terrible Trivium

The Terrible Trivium is one of the demons in The Phantom Tollbooth.

Appearance
He's humanoid, nicely dress with a bowler hat to complete and has no face.

History
He first appeared giving Milo, Tock and the Humbug tasks. For Milo move a huge pile of sand from one spot to another by using tweezers, for the Humbug dig a hole from a cliff by using a needle and for Tock, empty a well by using a eye dropper.