The Beetle! This design came together pretty quickly from a very rough earlier sketch. The name changed after the design, and in retrospect I probably would have gone more literal, but these guys were pretty fun to scoot around.
One challenge in-game ended up being their movement - since the wheels are so small from game view it was easy for it to look like they were just sliding around - but our animator Michael Cuevas did a great job making sure they looked lively on the battlefield.