Diy Zuul Costume . Louis is possessed by a demon named vinz, the keymaster, so they had to get. Zuul the gatekeeper, or better known as zuul, is one of the two. Pin on *Wholesome Cosplay from www.pinterest.com In the movie, dana barrett is possessed by zuul and declares herself the gatekeeper. 4.6 out of 5 stars. Adult dana as zuul ghostbusters costume | officially.