"Driven by the thrill of the chase, Lockdown is a bounty hunter by choice and a Decepticon only by necessity. He's got no real loyalty towards Megatron, but the Decepticons always pay on time, better than the Elite Guard, and allow him access to the systems upgrades he craves. Besides that, he's such a nasty piece of work that it's just easier for him to be a 'Con."

You can either go in a serious direction as he's a super serious bounty hunter, or Snake from The Simpsons (as that was a suggestion from the team).