Transforms into a 1974 Chevrolet Camaro (later a 2007 latest model) with yellow paint and black racing stripes. During combat, he deploys a battle mask over his head. Personality: Extremely loyal, brave, and possesses a gentle, human-like nature. Having lost his voice in a past battle, he communicates by piecing together radio clips (music and dialogue) from his car stereo, showing a touching dedication. Role: A young Autobot warrior sent to Earth as a scout to protect and monitor the protagonist, Sam Witwicky. He protects Sam as his personal car and serves as a bridge between humans and Autobots.

Transforms into a black GMC Topkick C4500 (large pickup truck). He is characterized by a rugged, heavy-armored body equipped with massive large-caliber energy cannons and plasma launchers on both arms. Personality: Extremely hot-blooded, bellicose, and a stubborn professional. Initially skeptical of Earth's technology and humans, he has an aggressive side, such as pointing his weapons at Sam's pet dog or seriously asking Optimus, "Shall we eliminate the pests (humans)?" Role: A long-time comrade-in-arms of Optimus Prime and the Autobots' weapons specialist (serving as a bodyguard and second-in-command). He is responsible for overwhelming firepower on the front lines.

Transforms into a lime green and red Hummer H2 rescue vehicle (ambulance). His right arm transforms into a sharp rotating saw, which he uses as both a medical tool and a weapon. Personality: Calm, rational, and extremely serious. As a scientist and doctor, he can be blunt and slightly socially awkward, such as analyzing and vocalizing the pheromones of scanned biological organisms. Role: The Autobots' medical officer (medic) and scientist. He supports the team not only by repairing injured comrades but also by providing technical and biological analysis of the situation.

Transforms into a silver Pontiac Solstice (sports car). He has visor-style eyes on his head and is equipped with a high-heat shield and gun on his arms. He has the smallest frame among the Autobots. Personality: Extremely cheerful and cool, with a love for Earth's street culture and music. He is agile and speaks in a funky manner laced with slang. Role: The Autobots' first lieutenant. Despite his small size, he is incredibly brave; during the final urban battle, he stood alone against the massive Megatron to serve as the rearguard.

Appearance: Instead of an Earth vehicle, he transforms into an alien jet (a stealth fighter-like spacecraft) that retains the organic design of the Transformers' home planet, Cybertron. His entire body is composed of sharp metal blades; his right arm transforms into a massive fusion cannon, and his arms can combine into a giant chain whip. Personality: A cruel, ruthless, and cold dictator with an overwhelming desire for dominance. An absolute evil charisma who looks down on humans as "insects" and cares nothing for the lives of his own kind if it serves his goal of ruling the universe with the AllSpark. Role: The absolute leader of the Decepticons. He crashed on Earth in the past and was kept cryogenically frozen by Sector 7 under the Arctic ice as "NBE-1 (Non-Biological Extraterrestrial 1)," but he is revived through the efforts of Frenzy and others.

Appearance: Transforms into a US military F-22 Raptor stealth fighter. Equipped with missile launchers and Vulcan cannons on his arms, he boasts overwhelming speed and firepower as an aerial force. Personality: Cunning, ambitious, and selfish. While outwardly swearing loyalty to Megatron, he attempted to become leader while Megatron was frozen; as a result, being scolded by the revived Megatron with "You fail me yet again" has become a staple. Role: The Decepticons' air commander (Number 2). He wreaks havoc in aerial combat, often blending in with human fighter squadrons to launch surprise attacks.

Appearance: A very small, metallic, skeleton-like figure. In the film, he transforms into a home CD player (boombox) and, after being destroyed down to just his head, into the heroine Mikaela's smartphone. He fires sharp metal cutter discs at high speed from his chest. Personality: Extremely restless, constantly screeching in high-pitched Cybertronian; he is both manic and humorous. Role: A Decepticon scout and infiltrator. He played a crucial role by infiltrating Air Force One to hack the US military network, locating Megatron and the AllSpark.

Sam Witwicky. Appearance: A typical, somewhat unrefined high school boy of the time. Personality: Timid and geeky, a boy in the height of puberty who wants to be popular with girls (especially Mikaela), but demonstrates strong justice and initiative by risking his life to protect his friends when it counts. Role: The human protagonist of this story. Because the coordinates to the AllSpark were engraved on the glasses of his great-grandfather, Captain Archibald Witwicky, when he discovered Megatron in the Arctic, Sam is targeted by both factions.

Sam's classmate, a stunningly beautiful girl with a great physique who is the school's idol figure. Personality: Contrary to her looks, she is tomboyish, tough, and very gutsy. Because her father was a car thief, she possesses genius-level knowledge and skill in auto mechanics, capable of stripping and repairing engines herself. Role: The heroine of this story. She gets caught up in the incident by being with Sam during a crisis, but uses her mechanical knowledge to save Bumblebee from a predicament and fights alongside Sam on the front lines as a warrior until the end.