6. Pinhead (Hellraiser)
"Your suffering will be legendary - even in HELL!" Who better to represent a corps powered by fear than a lord of hell who is renowned for his mastery over pain and torture? Pinhead wasn't always a torture demon. He was born a human named Elliott Spencer - a soldier - until he came across Lemarchand's box and was taken to hell, where nails were driven in to his head, all memories of his humanity were erased and he became a figure of pure horror. Pinhead has drilled fear into his victims - and indeed audiences - for no less than 9 films, spanning 27 years. He kills his victims slowly, ensuring they experience horrific, otherworldly pain in the process. Combining Pinhead's existing powers (super-durability, telekinesis, energy blasts etc) with the powers of a Sinestro Corps ring would be utterly terrifying for any potential foes and he might even pose a threat to Sinestro's leadership.