Ratchet (TFP)

Ratchet usually is a good friend, a caring person and an honorable mech. As Optimus' oldest friend, Ratchet knows Optimus the best, having been friends with him when Prime used to be called Orion Pax. However, he is easily angered, especially when his knowledge is questioned. Once, he helped Jack, Miko and Raf with their science projects for the science fair at school. However, the projects blew up, proving they were too dangerous for human standards, leading them to fail and Ratchet feeling insulted. Sometimes, Miko cannot stand some of his temperament, telling him to calm down all the time and keep his anger issues in check.

A running gag in the series, Ratchet's things are wrecked by any of the characters, mainly Bulkhead, and he often shouts "(Character's name), I needed that!"

Ratchet used to think lowly of humans, not even bothering to research human physiology when he is on Earth. Even when Optimus chose to save humans over Cybertron, Ratchet did not hide his disgust that Prime had sacrificed their home over Earth. However, his friendship with Raf changed his views on them. Because of this, Ratchet feels guilty for never learning medical skills for humans when Raf is injured and he is unable to save him.

In a twist of irony, it was the one to stay behind on Earth while the others departed for Cybertron.