The entity known as Ravana received an entry in the 2016 tie-in book "Tobin's Spirit Guide - Official Ghostbusters Edition" on page 42 and 43, where it is identified as a Class VII, Semicorporeal (can become intangible), free roaming, limited possessor.
For one scene, Billy West voices Roland Jackson, delivering the line "Then let's keep Ravana busy so Slimer can chow down as much as possible." It is unknown if this is a scratch track they forgot to replace, if West stood in for Alfonso Ribeiro, or if Alfonzo was unavailable to record his remaining dialogue for whatever reason.
Eduardo is playing with a Sony Playstation. Sony is the company that makes this series.