Lockdown

Lockdown is known as being one of the most ruthless Bounty Hunters in Cybertronian history. He's got no real loyalty to Megatron, but the Decepticons always pay on time, better than the Autobots ever could, and allow him access to the system upgrades he craves. Lockdown has a grisly habit of collecting "trophies" from his victims for his own use. He has attached a number of parts that appear to be stolen, such as his hook, chainsaw weapons, and parts of his left leg. His collection of stolen gadgets include quick-hardening cement spray, smoke bombs, and an EMP generator stolen from the Autobot medic Ratchet.

Once Lockdown has been paid to do something, nothing short of total deactivation will stop him from accomplishing his objective. Perhaps that is the reason Starscream hired him to help track down the ancient Mini-Cons.