Clown Ghost is sighted only in Multiplayer Jobs of the Ghostbusters: The Video Game (Realistic Versions).
The Clown Ghost is a Class IV Full Roaming Summoner.
The Clown Ghost often spawns in pairs and can be difficult to hit, as it continually releases many exploding balloons around itself. When it stops, it will twist up some balloon minions and fire them in your direction.
The balloons themselves register as Class II Dominating Ecto Fumes. They generally circulate around the area ramming into the player and causing a lot of damage, so keep moving or take care of the balloons early on.
Although there is no consistently reliable spawn point, Clown Ghosts appear in all the levels of Times Square. There is a 50% chance they will spawn in the third wave of containment of "Streets and Office."