Sure, other Decepticons may scoff at his decision to go with a land-based alternate mode, but Knock Out could care more. He knows the value of looking good and isn't afraid to let others know it. It's not simply his own lines he's interested in; he has an appreciation for well-built mechanical bodyforms of all sizes and functions... and a nasty penchant for tearing them apart after he's done admiring them. Slick, sly and snobbish, he's the Decepticons' medic, though he professes both a preference and proficiency for dis-assembly. However, his medical skill has kept him in high demand; he's even performed vital and experimental surgeries on Megatron.
While not entirely a coward, Knock Out also knows a good thing or two about self-preservation. When the going gets tough, Knock Out gets going - the opposite direction. He has no qualms with abandoning ship if only to save his hide, even if it means betraying a comatose leader or deserting altogether. He doesn't get the most respect on the Nemesis, either. Show him some kindness, and hey, maybe he'll stick by your side.
Both in the operation room and on the battlefield, Knock Out typically works with his brutish partner Breakdown. Knock Out is the speedster of the duo, swiftly striking his victim's vulnerables with his Energon prod in debilitating sneak attacks while Breakdown goes the "massive smackdown" route with his raw power.
His alt-mode is a Aston Martin One-77.