Technically, Janosz Poha was not inherently a villain, but he did spend most of Ghostbusters II under the control of the evil Vigo. Poha was an instrument in Vigo's hands, enacting his will and ...

[John Fin] put a lot of work into his Ghostbuster’s proton pack prop ... He’s ready to take on Vigo at anytime. You can see a video of his prop in action after the break.