Wheelbot

Wheelbot is a twisted transformer who serves Megatron. He's called Wheelbot for two reasons. One, he's a robot. Two, he's a wheel. It gets him down really, since he can't stand up, instead he just rolls around. In fact, he had to leave the Decepticons eventually because at the start of every battle he would just roll away, out of control.

In all fairness, he is a twisted individual anyway. He likes destroying things, and this eventually caught the attention of Ironhide and Optimus Prime, who decided to team up and blast him through the face. Thank the Fallen.