Ratchet

'"If you can break it, I can remake it." '- Ratchet Ratchet is an Autobot Medical Officer and became a key member of Optimus Prime's team, a brave and loyal field medic who though originally did not intend of becoming a soldier for believing that a more peaceful solution could be considered; rather calculative his intelligence and skill in surgery make him the best medic to have around, his function is aid and repair and he will unquestionably help his battle-worn comrades for them to fight another day.

Personality
Ratchet is seen as a calm and intelligent individual, whom thinks before he acts, he appears to rationalize and process things through rather than recklessly jumping into a dangerous situation, he shows a great deal of care for his fellow Autobot's and often advises them in several matters; he would always help to aid and repair his wounded comrades in battle, whilst displaying a great amount of bravery (as demonstrated when he fearlessly took on Sentinel Prime) as well as defiantly refusing to reveal Optimus Prime's location to Lockdown. Overall he has a very trusting and caring nature that most of the other Autobot's respect him for. Ratchet's death would have a heavy impact on the remaining Autobots, particularly Optimus whom viewed him as a close friend and was deeply saddened by his demise.But within a few years he will revived in a new body thanks to the k.s.i technology.

Skills and Abilities
As a field medic, Ratchet has been trained in various medical matters and procedures, demonstrating exceptional skill with surgical tools and supplies at his disposal, always managing to repair and restore his fallen brother-in-arms back to their feet, and has proven to operate well whilst in the battlefield. In terms of combat and weaponry, Ratchet appears to be able to hold his own against various Decepticon's even going up against Brawl, armed with a rotary saw on his left hand, along with a convertible machine gun from his right.

Optimus Prime
Ratchet is one of Optimus' oldest friends, the two have a good friendship as Ratchet greatly respects his leader's bravery and Optimus in turn considers Ratchet a great medic as well as a loyal friend. It is shown that Optimus has a high level of trust in Ratchet, and his calmness and intelligence easily identifies him as one of Optimus' closest lieutenants.

The two have proven to care deeply for each others well being as Ratchet expressed his concern for Optimus when the latter willingly spoke his intention of sacrificing himself in order to destroy the Allspark. Optimus stated it was honur to serve with him.

The two continued to fight at each others side during their battles with the Decepticon's on Earth. Optimus was deeply saddened by Ratchet's death, upon watching the footage of Ratchet's dissembled head, Optimus became enraged so much that he led a direct assault on KSI for what they had done to his fallen friend; Ratchet's death became one of the primary reasons Optimus had given up on humanity and almost considered leaving Earth and let humanity to fend for themselves.

Optimus later avenged him by Killing Lockdown, Optimus found peace afterwards knowing that he had finally his friend.

Ironhide
Ratchet and Ironhide have a positive friendship, although Ratchet has often shown to disapprove of Ironhide's actions, most notably his trigger-happy attitude as he occasionally advised Ironihde to be careful of his surroundings, Ironhide however jokingly dismisses his warning sand merely carries on indicating that Ratchet has acted as an old adviser to Irohnide for several years. However, despite their indifference the two heavily respect each other with Ratchet admiring Ironhide's bravery and level of skill in combat with Ironhide viewing Ratchet's medical skills and good natured heart, acting almost like bothers.

Ratchet was greatly saddened by Ironhide's death

Bumble Bee
"You fought bravely." - Ratchet commending Bumble Bee

Ratchet and Bumble have a good friendship as the two have fought beside each other for many years on Cybertron, Ratchet has shown to care for Bumble Bee, often giving him guidance on how to better act on his missions, Bumble in turn cares for Ratchet for all that he has done for him, most especially for the latter helping him repair his voice-box after a brutal confrontation with Megatron. The two have proven to be a great team and has battled effectively throughout their years on both Cybertron and Earth.

Trivia

 * The Live Action Film Series Ratchet was the first in Transformers Universe to have a green color scheme which is ironic as most of his other incarnations were presented in the iconic Red and white.
 * However the Toy line produced some figures of Ratchet in Red and White in order to make him look similar to his G1 counterpart with the title 'Rescue Ratchet'.
 * Ratchet was the only Autobot besides Optimus Prime and Bumble Bee to have survived the events from Transformers up until Age Of Extinction; marking a lifespan of almost 10 years on Earth.