I don't know about you, but my favorite part about Kenner's The Real Ghostbusters toys as a kid was the little companion ghosts that were included as accessories with many of the figures. Most of the sculpts for these little ghosts had fun, nicely done sculpts, and there was just something so cool about having little weirdo creatures included for the heroes to fight. Also, they were monochromatic, and some of them made of clear plastic, which are always pluses around here.
I did a post on these guys a while back, but I just recently managed to finish my collection with all of the sculpts (group shot above!). That means I've also been able to finish a project that's been about a year in the making--a guide / checklist for all of The Real Ghostbusters companion ghosts! In addition to photos of them all, this guide includes names, series, year, and which figures or vehicles each came with. If you're interested in this line, hopefully you'll find it helpful.
You can view and download the guide HERE.