Count Downer is a Jetstone warlord. He seems to be permanently depressed. During the attack on Jetstone, he is charged with escorting the double of King Slately to the throne room, during which he is croaked by an arrow.
Real World References
Count Downer's perpetually depressed state is likely a reference to being "down," or sad. A "Downer" is also a person or event that causes other people to be depressed.
A Count Down involves counting backwards as a way of measuring time before an event occurs.