Once a bright and idealistic doctor, Ratchet found this youthful optimism tempered as Cybertron descended into millions of years of civil war, giving rise to a brand of world-weary cynicism all his own. This cantankerous and sometimes gruff attitude is something of a façade he's deliberately cultivated to hide his natural compassion for his fellow Autobots and innocent organics. Following the end of the war, Ratchet's war-weariness led him to leave Cybertron aboard the Lost Light.