Voiced by: Peter Cullen
- An Axe to Grind: Carries one that's almost as big as he is.
- Badass Baritone: It's a given being voiced by Peter Cullen.
- Benevolent Boss :In contrast to Zeta or Megatron, and this inspires so much loyalty.
- Blood Knight: More or less admits he thinks being surrounded by enemies in the middle of their prison to be a good thing.
- Big Good: After Zeta Prime goes down.
- Though to be honest, he was already this even before Zeta Prime's death due to Zeta's questionable methods, disregard for his own men's lives, general arrogance, and mild incompetence.
- The Captain: At first.
- The Hero: Main character and all that.
- Humble Hero: Very much so. So much so that he refused to take command of the Autobots when everyone else around him knew he would be the perfect choice for the job. And only accepts when he is left with no other choice but to assume command .
- The Leader: Type IV; he leads by example and by being one of the most levelheaded, sensible, and honorable of the Autobots gaining their respect and undying loyalty through his sheer strength of will, determination and genuine love and care for his comrades.
- Nerves of Steel: No matter how dangerous or dire the situation. No matter how grim things may look, he never loses his cool and always remains calm and levelheaded.
- Nice Guy: He wouldn't be Optimus Prime if he wasn't this.
- Primary-Color Champion: Naturally.
- The Stoic: Until something happens to Bumblebee.
- Time to Step Up, Commander: Most of the Autobots soldiery wanted him to go Prime, but he was too humble to go for it.
- You Are in Command Now: Is given full leadership of the Autobots by the council after the death of Zeta Prime.
Voiced by: Johnny Yong Bosch
Voiced by: Keith Szarabajka
- Deadpan Snarker
- Grumpy Old Man
- Old Soldier: He's the oldest-sounding of the Autobots and is still strong enough to offline two Brutes within five seconds. With his bare hands.
- Red Oni, Blue Oni: The blue to Warpath's red.
- Super Strength: Both the above feat and lifting up a statue many times his size are the results of this.
Voiced by: Jamieson Price
- Blood Knight: Absolutely revels in the fighting and the joy of battle. Moreso then most Autobots.
- Hover Tank: His vehicle mode.
- Large Ham: BAM! POW!
- Leeroy Jenkins
- Saying Sound Effects Out Loud
- Proud Warrior Race Guy
- Red Oni, Blue Oni: The red to Ironhide's blue.
- Tank Goodness: One of the few overtly military alt-forms for the Autobots.
Voiced by: Travis Willingham
- Blood Knight: During his stage, almost every word he utters is either a hilarious joke or about how much he loves the fact they're stuck in a Decepticon prison.
- Boisterous Bruiser
- Cool Car
- Deadpan Snarker
- Fun Personified
- Lightning Bruiser: Noted to be the one of the fastest Autobots and definitely not the weakest.
- The Nicknamer: Constantly trying to give Bumblebee a nickname.
- Proud Warrior Race Guy
Voiced by: Patrick Seitz
Voiced by: Troy Baker
- Cool Plane
- Defector from Decadence: Used to work for Starscream, but after Starscream betrays him he sides with the Autobots.
- HeelFace Turn: Downplayed. When the game begins, he's a Neutral; he only officially joins the Autobots after Starscream aligns himself with Megatron.
- Only Sane Man: Of the Neutral faction in the first chapter. He desperately tries to reason with Megatron and later Starscream that Dark Energon is too dangerous to be used as a weapon. Megatron's too arrogant to listen and Starscream just sees a chance to gain power for himself.
- The Smart Guy
- Wing Man
Voiced by: Troy Baker
- Anti-Hero: On the one hand he's opposing Megatron, so he has to be as hardline as possible, and while he's ruthless in battle the Decepticons' plan will doom Cybertron. On the other hand, he cares very little for his own troops and is utterly ruthless in battle, and the tie-in novels imply he was one reason the war broke out.
- Big Good: Preceding Optimus Prime, though he's not quite as competent. He also subverts it as his caste system was the main reason Megatron could rise to power.
- Composite Character: He has the name of Zeta Prime, but is more or less Sentinel Prime in that he precedes Optimus Prime. Transformers: Exodus makes it worse by calling him just that. Hasbro apparently claims that both are accurate, and Optimus's predecessor as Prime was named Sentinel Zeta Prime.
- Doomed by Canon: As Zeta Prime, everyone in the audience knows he's scrap.
- Defiant to the End: Say what you want about him, he doesn't beg when Megatron gets his hands on him.
- : Does this throughout his fight with Megatron and co.
- : Also hams it up like this, a sign his power is going to his head.
- Foil: To Megatron. On the one hand, he is a corrupt bastard and the main reason Megatron rose to power. Megatron leads his army from the front lines, while Zeta spends most of the Decepticon campaign hiding behind his troops and giant war machine. On the other, Zeta is not a sadist unlike Megatron, and is actively trying to protect Iacon and everyone else from a mass murdering warlord and his lackeys.
- Hero Antagonist: Of the Decepticon Campaign. While he was corrupt and far from a saint, he was fighting to protect the rest of the Autobots from Megatron's megalomania. As horrible as he was Megatron was so much worse.
- Hero's Evil Predecessor: Tie in novels explain that he's this to Optimus. Thanks to Zeta's caste system, bots all over Cybertron were treated as little better than slaves to those who were rich or had better alt-modes. Megatron exploited this and created the Decepticons. Optimus initially rejects the rank of Prime because he didn't want to be seen as more of the same. The war and his own innate heroism prove he's far better than Zeta, something Zeta admits before dying.
- Flunky Boss: Summons clones to aid him during battle.
- General Ripper: If his tactics are anything to go by.
- Large Ham: About as much as Megatron. This is not an accident.
- Not So Different: He gloats, cares little for his own men, and is supremely arrogant, just like Megatron. The big difference is Megatron's sadism.
- Pride: His fatal flaw. He is unable to see or admit that the caste system he created was ruining countless lives even before the war broke out.
- Small Name, Big Ego: He's all bark and little bite, and lacks both the madness and will of Megatron.
- This Cannot Be!: Says it word for word upon his defeat.
- We Have Reserves: Has no qualms about sending his forces into the grinder.
Voiced by: Fred Tatasciore
- Arm Cannon: Two of them.
- Attack of the 50-Foot Whatever: His boss fight's second and third rounds play out like this.
- Badass Baritone: Fred is in rare form here.
- Bus Crash: The Sequel mentions in an audio tape that at one point between games he defended Iacon from an attack by Megatron who managed to make a small opening in his armor and firing dark energon into it which eventually caused him to go into stasis lock.
- Cool Ship: His alt-mode, which as big as the cruisers the Decepticons use.
- Determinator: Even he keeps taking damage from being corrupted by Dark Energon, he keeps fighting.
- Fastball Special: One of his more damaging attacks, utilizing a Tractor Beam to yank the unfortunate 'Con in.
- Final Boss: Of the Decepticon campaign.
- Hero Antagonist: Unlike Zeta Prime, Omega proves an actual heroic character, the boss fight with him has him making comments to keep fighting in Iacon's defense. So he would be cool to have as an ally, but most of his screen time is in the Decepticon campaign.
- Humongous Mecha: Huge even by cybertonian standards.
- Macross Missile Massacre: One of his desperation moves.
- Nigh Invulnerable: His robot mode is immune to most forms of attack. The way too damage him is through corruption by Dark Energon.
- No Indoor Voice: LOWERED VOLUME: IMPOSSIBLE.
- Terse Talker: MISSION: DESTROY MEGATRON.
- Wave Motion Gun: His most powerful attack, which does in his alt-mode, which can tear buildings apart.
Voiced by: Fred Tatasciore
- Arm Cannon: His default weapon.
- Asskicking Equals Authority / Authority Equals Asskicking: He fought his way to his command through the gladiator pits and consistently proves himself to be the most combat-savvy of the Decepticons.
- Bad Boss: To the regular Decepticon soldiers, if they dare protest. If the named officers complain or try to suggest a less suicidal alternative, though, he'll tell them to shut up."Unacceptable! They should be victorious, or dead!"
- Berserk Button: Tell him that his plan is nuts or suicidal. Best case, you get off with a warning. Worst case, you get shot.
- Big Bad: Of the game.
- BFG: His default weapons.
- Carry a Big Stick: He has a large blade covered mace as a melee weapom.
- Catchphrase: "I shall not be denied!"
- Determinator: Protest as to the otherwise absolutely suicidal nature of the current mission, he will roar for the course to be stayed. Even if it means ramming a frigate right into a space station, while he's on the bridge.
- Deadpan Snarker: Breakdown seems to have a particular gift for bringing it out of him.Megatron: Into the tunnels, Decepticons, and try not to get crushed by the trains.Breakdown: You're joking, right?
- Evil Laugh: Reserved for the right occasions, but he does it.
- Evil Overlord: After taking down Omega Supreme, he takes over Cybertron and most of the Autobot campaign is spent trying to take it back.
- Evil Sounds Deep: Just LISTEN to that voice...
- Guttural Growler: He's Megatron; of course he growls and snarls when he talks.
- Hero Killer: Actually subverted: while he deals most of the damage to Zeta Prime, it's actually Soundwave who ultimately kills the Autobot leader. Played straight with the many Autobots that he kills over the course of the story though.
- Hidden Depths: When traversing through the Trypticon space station, Megatron states he looks forward to updating it's obsolete technology indicating he has an interest in tech.
- Hypocrite: For all his All There in the Manual backstory about wanting to dismantle Cybertron's overly-restrictive Fantastic Caste System, his actual actions in the game involve bellowing about liberating Cybertron from The Evils of Free Will and imposing his own instead.
- Large Ham: Only Zeta Prime could possibly equal him.
- Necessarily Evil: What he views himself as.
- Red Eyes, Take Warning: Just LOOK at him.
- Tank Goodness: His altmode.
- The Unfought: Not only is he not fought in the Autobot campaign, he and Optimus never actually meet in person.
- Utopia Justifies the Means: Views his victory as the start of a grand new age. Anybody that doesn't follow him thinks otherwise.
- Villainous Valor: One of the main reason the Decepticons are loyal to him despite being a Bad Boss, he's not afraid to do anything he'd order them to do himself, probably part of why his men running from a fight ticks him off so much.
- Villain Protagonist: He's both a playable character and the primary source of conflict in the game.
Voiced by: Nolan North
- Adaptational Intelligence: He may be a tough brute, but unlike his past selves, he has the mind of a commander.
- Blood Knight: Brawl just loves to fight, and is eager to charge into the fray.
- Evil Sounds Deep: Has a deep, booming bass voice to signify his position on the villain's side.
- Mighty Glacier: Proves to have great strength, but compared to the other Decepticons he's relatively slow and clumsy.
- One-Man Army: Manages to take out an entire squad of Autobot troops that were dogpiling him during the assault on the archives.
- Tank Goodness: He turns into an alien hover-tank in his alternate mode.
Voiced by: Steve Blum
- Commander Contrarian: He's constantly whining and complaining about the current situation. He still follows Megatron loyally and gets the job done, which is why Megatron puts up with it.
- Cool Car: Turns into an alien muscle-car in his alternate mode.
- Deadpan Snarker: He is, without a doubt, the most sarcastic of Megatron's followers, constantly snarking about the situations he finds himself in.
- Evil Sounds Deep: His voice is extremely deep and iconically "villainous" sounding.
- Guttural Growler: He actually growls and snarls more than Megatron does.
Voiced by Isaac Singleton Jr.
- Badass Bookworm
- Creepy Monotone
- The Dragon: Serves as Megatron's second-in-command for most of the game, since Starscream's a more recent recruit when the game takes place.
- The Dreaded: If Bumblebee's words are anything to go by, most Autobots fear him, and with good reason.
- Drone Deployer
- Even Evil Has Loved Ones: Well, sort of. He won't hesitate to rush out to save his cassettes on the grounds that they're his best friends.
- Evil Genius
- Hero Killer: He's the one who ultimately delivers the fatal blow to Zeta Prime.
- Papa Wolf: Risks injury and death in order to rescue his cassettes when they're downed.
- Torture Technician
- Villainous Friendship: As usual, a mutual one with Megatron: Soundwave is unquestioningly loyal to Megatron, while Soundwave is the only Decepticon that Megatron seems to genuinely respect: unlike his other troops, he never abuses or threatens Soundwave.
Voiced by: Sam Riegel
A Cybertron Sky Commander who is initially aligned with the Autobots, Starscream has spent over a thousand years serving as the operating commander of the Energon Station, a derelict orbital Energon processing and delivery satellite that also happens to be the last repository of Dark Energon in Cybertron. Although he initially does his best to thwart Megatron's scheme, seeing the Decepticon ruler is the first bot to ever be able to control Dark Energon makes him defect to Megatron's side.
- Adaptational Badass: In contrast to his traditional depiction as a coward and an unskilled combatant at best, this Starscream is a genuinely brave and skilled warrior, even defeating the Aerialbots and actually going toe-to-toe with Optimus, Bumblebee and Ratchet, all at the same time and putting up a decent fight until they injure him sufficiently that he wants to flee. Even in the first mission, he openly stands opposed to Megatron, resisting him physically and verbally until Megatron proves he's more than just another mad-dog whose ambition outweighs his brains.
- Bad Boss: As shown when you take control of him in the Decepticon missions, Starscream is a real Jerkass to his subordinates, repeatedly insulting, mocking and deriding them.
- Cool Plane: Turns into an alien jet-fighter, somewhere between his G1 "Tetra-Jet" Cybertronic form and the American jet-fighter he becomes after landing on Earth.
- The Dragon: He comes to serve this role to Megatron.
- FaceHeel Turn: He's aligned with the Autobots at the beginning of the game note , only to switch loyalties at the end of first chapter when it's revealed Megatron can control Dark Energon.
- It's All About Me: Whenever he speaks, he puts a lot of emphasis on words such as "I" and "My".
- Pride: More or less echoed in every scene he has. He thinks so highly of himself that he wants to overthrow Megatron simply because he hates having to work for someone else.
- Reassigned to Antarctica: His assignment to the Energon Station, a 10-thousand-plus years old facility that's falling into obsolescence, is strongly implied to be some kind of punishment for something that Starscream did whilst serving as a "proper" Sky Commander for Cybertron. Exactly what that is, however, is never revealed.
- Seen It All: Invoked; initially, he defies Megatron because he's seen and studied the countless cases of fools trying to exploit Dark Energon, only to be destroyed or hideously mutated by it. It's not until he sees that Megatron really can control it as he claimed that Starscream decides that maybe there's something to be had from switching sides.
- Small Name, Big Ego: Although it doesn't work immediately, Megatron plays him by a harp by promising him a return to glory after the Noodle Incident that saw him practically exiled to the Energon Station.
- Smug Snake: Starscream's sheer ego leads to him making a lot of unwise plans and greatly overestimating himself.
- The Starscream: Of course. He starts the game actually allied to the Autobots, guarding the Energon Station and the last supply of Dark Energon. When Megatron shows he can actually control it, he turns on the Autobots to ally with the Decepticons, secretly planning on usurping control of the Decepticons from under Megatron once he learns how to control Dark Energon himself. Megatron is aware of it, but finds some his qualities, amusing, so he keeps him around.
- Took a Level in Dumbass: Not many people remember it, of course, but G1 Starscream was a scientist before he became a warrior, and he often served in a science-guy role in the G1 cartoon. This iteration of Starscream is more strictly military skilled, being completely uninterested in the scientific discoveries that he, Skywarp and Thundercracker make in Cybertron's underground.
- You're Insane!: Repeatedly tells Megatron that he's an idiot to consider messing with Dark Energon in the first mission, pointing out that in centuries of trying, nobody has ever been able to control it.
Voiced by: Graham McTavish
- Cool Plane
- Anti-Villainous Genius
- FaceHeel Turn: He starts out aligned with the Autobots but defects to the Decepticons along with Starscream.
- Only Sane Man: He's really the only Decepticon seen who isn't bloodthirsty or fanatical, and by the sound of things would prefer some scientific study of Cybertron's literal underworld.
- Wing Man
Voiced by: Richard Epcar
Voiced by: Crispin Freeman
- Bunny-Ears Lawyer: Despite his nerves and whining, he's fast and a competent soldier otherwise.
- Butt-Monkey: Megatron snarks and yells at him the most. If only because he's the only one that doesn't get executed for back talk.
- Cowardly Lion: He's always complaining about Megatron's suicidal plans, but he's still up there with him at the front.
- Deadpan Snarker
- Expy: The scratchy, youthful voice, paired with his young punk archetype and his relationship with an abusive Villain Protagonist mentor using a super-science chemical to take over the world, paired with his name all combine to bring to mind Jesse Pinkman.
Voiced by: Fred Tatasciore
- Attack of the 50-Foot Whatever
- Ax-Crazy: A Weapon of Mass Destruction that loves his job.
- Beware My Stinger Tail
- Breath Weapon
- Death from Above: What Megatron uses him for.
- Everything's Better with Dinosaurs
- Evil Gloating: Nearly every line he utters has him mocking the Autobots and their attempts to defeat him.Trypticon: You thought you could destroy me? You thought you could destroy Trypticon? Ha! Pathetic!Bumblebee: He's just laughing at us!Trypticon: Abandon hope, vermin; your death approaches!
- Evil Sounds Deep: Very.
- Expy: Mechagodzilla, is that you?
- Final Boss: Of the Autobot campaign, and thus the game as a whole.
- Giant Space Flea from Nowhere: Only narrowly averted since he's shown in the opening FMV, aside from that, he appears out of nowhere.
- Genius Loci
- Guttural Growler
- Humongous Mecha: You wanna know how big? Try having a slagging space station as his alt-mode.
- Kill Sat: His alt-mode.
- Large Ham: The largest one in the game, in every sense of the word.
- More Dakka: Let's see, Trypticon has: A gun in his mouth; guns on his shoulders; a rapid-fire gun in his nose; and four gun turrets on his tail, which also houses a ridiculous amount of missile launchers. Put all of these together, and you have an incredibly lethal boss on your hands.
- Wave Motion Gun: FEEL THE BURN OF MY LASER!
- Weapon of Mass Destruction: He's able to blow up Cybertronian ships with complete and utter ease and is able to tank even the most devastating attacks. I think this counts.
- So wait.... wouldn't this make him an.... Instrument of Destruction?