The Undead, understandably, exhibit a healthy respect and unmatched fear when confronted by Ghost Roaster, a skeletal ghoul/Skylander who has a voracious appetite for ghosts.
Portal Master Eon gets credit for discovering and indoctrinating Ghost Roaster into the ranks of Skylanders, but only after securing the ghoul's promise to devour only evil ghosts. Able to switch to Ectoplasm Mode when needed, Ghost Roaster is virtually immortal, although the practice comes at a price to his overall health, so he's learned to utilize the ability sparingly.
As a ghoul, Ghost Roaster can also call upon various "dark" skills, such as haunting and the dreaded Nightmare Touch to subdue foes. As if more were needed, he can transform his skeletal frame into a swift and deadly flaming skull and his spiked ball-and-chain tail has ended countless battles with those foolish enough to challenge him.