The evil/creepiness of Ray
So, Ray was closer to evil than the other ghostbusters? So creepy now that I think about it.
1) Ray gave the idea to Gozer to manifest the stay puft marshmallow man.
2) Vigo was able to momentarily possess Ray in G2. Earlier on in the film, the gaze of Vigo in the painting was hypnotizing him.
3) Ray was the first one to see Slimer in G1, if that means anything.
4) And wasn't Ray the one who had the wet dream experience with the ghost woman in G1 as well? The ghost woman wasn't bothering Egon or Peter.
5) Ray owned his own occult bookstore in G2.
Anything else that hints at him being more suggestible to evil?