I had this really strong mental picture of the Dig-Dugger. They'd burrow along at Bugs Bunny speed, pop out of the ground, smile, and say "Oh Hai!"... or something like that. Dig-Dugs are friendly folks that spend a lot of time underground, so when they get to talk, boy-howdy! I wanted each one to have his or her own custom gear, pick-axes, armor, and so forth. Not that they are gear-centric creatures, but they'd have lots of time to let their imaginations run wild and only a limited number of creative outlets.
I'd be a Dig-Dug.