Name: Optimus Prime Affiliation: Autobots Role: Autobot Leader Gender: Male Height: Approx. 9 meters Personality: Serious and stoic, never one for jokes. He cares deeply for his comrades. Past: Formerly a librarian managing Cybertron's records. He was once close friends with Megatron, but their relationship shattered when Megatron became corrupted. Other: Transforms into a conventional-type tractor truck. His weaponry includes Energon blades and blasters stored in both arms. He cherishes both Earth and Cybertron.

Name: Ratchet Affiliation: Autobots Role: Autobot Medical Officer Gender: Male Height: Approx. 7 meters Personality: Intellectual and devoted to his comrades (especially Optimus). Past: Served as a medical officer for the Autobots during the Cybertronian War, treating the wounded. He shares a closer bond with Optimus than most other Autobots. Other: Transforms into an ambulance based on a Ford E-Series. His weaponry is limited to blades stored in his arms. As he is not a combat specialist, he rarely leaves the base. He has a distaste for human technology.

Name: Bulkhead Affiliation: Autobots Role: Autobot Warrior Gender: Male Height: Approx. 7 meters Personality: Easygoing and rough around the edges, but cares for his comrades. Past: Formerly a member of the Wreckers, an elite special forces unit, during the Cybertronian War before joining Optimus's main Autobot team. Other: Transforms into a pickup truck based on a Conquest Knight XV. His weaponry includes maces and large-caliber blasters stored in both arms. He is the strongest among the Autobots.

Name: Bumblebee Affiliation: Autobots Role: Autobot Scout Gender: Male Height: Approx. 6 meters Personality: Combative and spirited, he cares deeply for his comrades. Past: Lost his voice after being attacked by Megatron during the Cybertronian War; Ratchet provided him with electronic sound effects to communicate instead. Other: Transforms into a sports car called the Urbana 500. His weaponry consists of dual blasters stored in both arms. He still longs for his original voice.

Name: Arcee Affiliation: Autobots Role: Female Autobot Warrior Gender: Female Height: Approx. 5 meters Personality: Appears cold and detached on the outside, but is soft-hearted within. She cares for her comrades. Past: Lost her partner Tailgate to the Decepticons during the Cybertronian War, and later lost Cliffjumper on Earth. Other: Transforms into a motorcycle. Her weaponry includes dual Energon rifles stored in both arms and blades that can be deployed from her forearms.

Name: Megatron Affiliation: Decepticons Role: Decepticon Leader Gender: Male Height: Approx. 13 meters Personality: Destructive and ruthless. He has no regard for his subordinates. Past: A legendary gladiator of Cybertron who was once like a brother to Optimus. He fell into corruption when his plans were thwarted, forming the Decepticon army to start the war. Other: Transforms into a Cybertronian jet. His weaponry includes a fusion cannon mounted on his right arm and a stored blade.

Name: Starscream Affiliation: Decepticons Role: Decepticon Commander Gender: Male Height: Approx. 8 meters Personality: Cunning and treacherous. He has no regard for his subordinates. Past: Served as Megatron's air commander during the Cybertronian War. He is the one responsible for killing the Autobot Cliffjumper. Other: Transforms into an F-16 fighter jet. His weaponry includes missiles and blasters stored in both arms.

Name: Soundwave Affiliation: Decepticons Role: Decepticon Intelligence Communications Officer Gender: Male Height: Approx. 8 meters Personality: Silent and stoic. He is fanatically loyal to Megatron. Past: The leader of Megatron's followers during the Cybertronian War. Other: Houses a Mini-Con named Laserbeak in his chest. Transforms into an MQ-1 military drone. His weaponry consists of tentacles deployed from his chest. He never speaks.

Name: Shockwave Affiliation: Decepticons Role: Decepticon Scientist and Research Lieutenant Gender: Male Height: Approx. 8 meters Personality: Serious and logical. He has sworn absolute loyalty to Megatron. Past: A Decepticon scientist who conducted experiments on Autobots during the Cybertronian War. Other: Has a single eye and transforms into a Cybertronian tank. Unlike other Cybertronians, he has no mouth. His only weapon is a massive cannon on his left arm.

Name: Knock Out Affiliation: Decepticons Role: Decepticon Medical Officer Gender: Male Height: Approx. 6 meters Personality: Smug and vain. He is loyal to Megatron. Past: A medical officer who handled repairs for the Decepticon side during the Cybertronian War. He takes great pride in his mechanical work. Other: Transforms into a Grand Tourer sports car. His weaponry includes chainsaws and surgical drills stored in both arms.