Ratchet is an Autobot and the resident medical officer of Team Prime. He's usually a good friend, a caring and honorable mech. He is the oldest of the team, generally less excitable/enthusiastic as his teammates or the human kids. Usually grouchy and sarcastic, he is a good bot at heart and doesn't like to see anyone hurt. As Optimus' oldest friend, Ratchet knows Optimus the best. He wasn't too fond of humans, but grew attached. He puts others before himself, often not refuelling so others can.