Vigo the Carpathian
Vigo the Carpathian was a 16th century Moldavian magician and tyrant who was poisoned, stabbed, shot, hung, stretched, disemboweled, drawn and quartered by his subjects in 1610 at the age of 105. He was known as Vigo the Cruel, Vigo the Torturer, Vigo the Despised, and Vigo the Unholy. Before his head died he uttered the words "Death is but a door, time is but a window, I'll be back."
In 1989 Vigo's spirit, which he had inserted into his self-portrait, made his bid to take over the world. His portrait had ended up at the Manhattan Museum of Art and he made the museum's curator, Dr. Janosz Poha, his servant in order to help him find a child so he could live again. Meanwhile Vigo had been building up a psychohmagnatheric slime flow in the city's old Pneumatic transit system. This slime fed on negative emotions but could be positively stimulated as well. With this river of slime Vigo had the power to send ghosts all over Manhattan to distract the city while he tried to obtain baby Oscar.
Vigo's plan was put into motion on the eve of the New Year 1990, Vigo used his possessed servant, Janosz to kidnap Oscar, Dana followed and once she entered the museum the river of slime was used to create a dome around the museum keeping everyone else out. The slime's evil energy was so powerful that the Ghostbusters' particle streams couldn't penetrate it. The Ghostbusters used the Statue of Liberty, in combination with the positively stimulated slime, to rally the citizens of New York to help them break through the slime dome. This caused Vigo's possession of Oscar to be temporarily broken while the Ghostbusters entered. Vigo then appeared outside of the painting, obviously he was able to manifest himself temporarily but he still needed a human body. The Ghostbusters fired their throwers at him and he threw them back sticking them to the ground. He then grabbed Oscar and attempted to possess him again but singing from outside came in and the positive energy weakened Vigo. He retreated back to the painting where the Ghostbusters defeated him, despite his short possession of Ray.
Vigo was played by Wilhelm von Homburg, who unfortunately passed away on March 10th 2004.
Ghostbusters: The Video Game
Vigo appears in the firehouse in his painting near Janine's desk on the right from the firehouse doors in Ghostbusters: The Video Game. In the Wii version, it is in the basement near the Storage facility. If they player interacts with the painting, it will talk to them, with over 100 different line variations. Its reason for existence is unknown, seeing as it was melted at the end of the movie to reveal a painting of the Ghostbusters.
An explanation could be that this is not the original painting, but a replica that Vigo's spirit now inhabits.
Another possibility is that the painting of Ghostbusters (which itself was created by changing Vigo's powers into positive energy) still held what's left of Vigo after his defeat, and after some time it returned to its normal form (Vigo painting). However, Vigo's spirit is now nearly powerless and unable to act outside the painting, making it unessential to even put him into Containment Unit.
Another theory is that the shockwave at the beginning of the game could of reverted the painting back to it's original form.
In Ghostbusters: the Video Game Vigo's painting stays in the firehouse. When the interact button is pressed Vigo comes to life and talks to you. The painting resembles that of the one in the movie, and Vigo is, once again, voiced by screen actor Max Von Sydow.