Vigo von Homburg Deutschendorf
Vigo von Homburg Deutschendorf was the ruler of Carpathia and Moldavia. On a mountain of skulls, in a castle of pain, he sat on a throne of blood. Not exactly a man of the people, the evil tyrant gave himself such nicknames as the Scourge of Carpathia and the Sorrow of Moldavia, and was also known to his people as Vigo the Cruel, Vigo the Torturer, Vigo the Despised, and Vigo the Unholy (and, according to Peter Venkman, he was also Vigo the Butch). In 1610 his people rebelled against him, and decided that his death should equal his cruelty. Vigo was poisoned, stabbed, shot, hung, stretched, disemboweled, and finally drawn and quartered. Before he finally died, his severed head uttered his last words: "Death is a but a door, time is but a window. I'll be back!"
And in 1989, he did come back. His spirit possessed a portrait he had painted of himself which was on display at the Manhattan Museum of Art. His plan was to draw strength from an underground river of slime generated by the negative emotions of the people living in New York, then possess the body of a child on New Year's Eve so that he could live again. Using his dark magic, he brainwashed the museum's curator, Janosz Poha, instructing him to find an infant. Janosz picked Oscar, the baby of his employee Dana Barrett, and eventually kidnapped him. Vigo would eventually be thwarted by the Ghostbusters, who researched his background and deduced his connection to the river of slime.
On New Year's Eve, Vigo had gathered enough strength to actually exit the painting and attempt to take over Oscar's body, but the evil spirit was weakened by the singing of crowds outside the museum who were celebrating the birth of the new year. Vigo retreated back into the painting, transforming into a hideous monster, and briefly took over the body of Ray Stantz. The other Ghostbusters then covered Ray with positively-charged slime, blasting Vigo back into the painting again. Vigo's ghost was then dispelled forever when the painting itself was doused in the slime.