Ratchet

Back On Cybertron, Rachet was the best mechanic and machinist around. The only thing that kept him from true greatness was his constant partying. Years of war and a series of tragic encounters with Megatron have tempered his good nature, leaving him with a melancholy edge and a sour bedside manner. He's still the finest medic the Autobots have at their disposal, but these days he's more distractedby his bad memories than his late nights.