Turbo, I remember him being a tough guy back in the day. I used to pretend Lightspeed was Turbo when I played Transformers and that Afterburn was Scooter.
My favorites were: - Leader 1 (blue/white) - Cy-Kill (black/green) - Hans Cuff - Crasher (black) - Pincher - Beamer (Wendy's Go-Bot)
Royal-T (Harrier Robo) was always my favorite. Dive-Dive was a close second, and I liked Dozer and Rest-Q as well. I also really liked the Monogram kit of Cy-Kill, but I didn't build it in the traditional Cy-Kill colors. (Do you remember, that old lullaby?)
Super Cy-kill and Super Leader-1. I had both as a kid and the build/play-ability on those rivaled most of my TF's. I have them along with many others (I did not have as a kid) in a GB collection but they are still 2 of the best in my mind.
Small Foot and Pathfinder were always my personal favorites. When it came to creating female characters I actually think GoBots really did a better job than the original Transformers series.
There were so many great Gobots. Jeeper Creeper was my favourite. Cy-Kill, Crasher, Fitor and even Scooter deserve mention too.
I had the following growing up: BuggyMan Cy-Kill Leader-1 Rest-Q Between the lot I'd go with Cy-Kill. Never watched the cartoon.