Yeah I get what your going for Gok and happy to play along but I too think I need to go against the definition..

I mean, Rung is by this definition, Obscure.

Whereas the Pretender Vehicles, Ultra and Mega Pretenders (with some exceptions) only had toys with what can best be described as extra's work in a couple panels where they appeared in the background.

That said, in fair play to this thread, how about:
Rubble
Geomotus
Froid
Sunder
Fulcrum
Longview (Heck, all of the Real Gear Robot's?)
Centurion

I assume we aren't including humans in this list?

Also, pretty sure I met Monzo at a Botcon one year...