EgonSpengler86;166722
I remember an episode that was in the 90s where the ghostbusters adopt this green ghost that has legs and this ghost ends up bringing a whole bunch of ghosts to the fire house including the ghost toilet. And it's not Buster the ghost. I looked all through the booklet and couldn't find it.
Your description seems to have elements of both “Buster the Ghost” and “Victor the Happy Ghost”, though both are blue, not green. Its possible this was a comic book somewhere, perhaps one of the Marvel UK's. Given the proclivities of memory, it's also possible this was an episode of an unrelated show that was “misfiled” in with your RGB stuff. Lord knows I've done that often enough.