Robot Devil

The Robot Devil is the dark lord of Robot Hell, as warned by the Temple of Robotology. It is unknown when the Robot Devil was built, but he has probably been around since at least 2275. The ruler of Robot Hell, he spends most of his time dishing out ironic punishments and gambling with souls. He has a holiday home in Hell's Kitchen in New New York that he bought from Kathie Lee Gifford's Head.

Quotes
Robot Devil: 'Salright, you can say that here. Bender: [walks to next cell] Hey that guy says... Robot Devil: I heard him!
 * Bender: Aw, hell- I mean, heck.
 * Robot Devil: You can't just have your characters announce how they feel... that makes me feel angry!
 * Prisoner: (to Bender disguised as Robot Santa) Hey Robot Santa, when you see the Robot Devil... tell 'im I'm'a comin'!

Trivia

 * The Robot Devil is also a collectible toy, featured in the Toynami Futurama series 1 to 5.