So I'm really weird and decided to type up a bunch of stuff from The AllSpark Almanac, for those who are interested. It does not include any of the events that occurred in Season 3, such as Sari's upgrade. Obviously, months of character development in-game (for most of these) have made profiles a bit "outdated", but here you go anyway.
OPTIMUS PRIME
Some bots are built great, other have greatness thrust upon them. After proving unable to flourish in the Elite Guard, Optimus Prime was consigned to the unglamorous duty of space-bridge repair. It was in this capacity that he found himself protecting our race's most precious cargo, the AllSpark, from the deadliest adversary imaginable, the malevolent Megatron. This unlikely hero managed to defeat Megatron, but crash-landed on the planet Earth. He made peaceful contact with the organic natives there and proceeded to defend them and the AllSpark from Decepticon aggression.
I have been fortunate enough to witness Optimus Prime's leadership in battle first hand. Though rough around the edges, he is a bot of courage, strategic thinking, determination, judgment and loyalty. Possessing a keenly developed sense of integrity, he stands by his principles even when it is inconvenient to do so.
Optimus is equipped with a variety of tools to help him accomplish his aims. His solitarium Ultra-Axe has a laser blade, a plasma rocket, and an extendable handle, and he wields it expertly. He utilizes his built-in grapplers with pinpoint precision, and is armed with a bolo-cannon to incapacitate enemies without causing them undue harm. He transforms into a truck designed for combating out-of-control combustion, and can replace his trailer for specialized missions. -Ultra Magnus
RATCHET
Can't say I'm much of a fan of those leaky-manifold Autobots. But old buckethead here is a force to be reckoned with. Oh, don't let this son of a gun fool ya! He's more than a grumpy 'ol tinkerer. There's quite a pair of fuzzy dice on this one. Back in the day, grandpa here fought in the Great Wars. He was apparently responsible for saving a bunch of bots ... only to have them march back to the frontline. Or maybe I should say: offline. Anyway, our paths crossed 'round that time. After that he was never quite the same. See, I'm the guy that made oldie here so "pretty." So he put himself out to pasture and ended up in deep space. Imagine that - a Protihex Medical Mechanical graduate fixing space bridges. Still, I can't fault Cool Hand Lube's courage. I've seen him risk everything for his comrades.
If you're planning to go up against the old crankshaft, here's what you need to know. He recently reacquired an EMP generator that can put just about anyone into stasis, though he doesn't always carry it on his person. He's also got dandy little magnetic manipulator devices that he uses to surprising effect. There's a whole passel of other medical tools that I'm less interested in, but, given enough time, he can use 'em to fix just about anything. One of these cycles not long from now he'll be runnin' into me again, and then I'll be the one with an EMP and magnetic manipulators. -Lockdown
PROWL
Geez, as if I don't have enough to do now I have to talk about these Autobots? Alright, let's get this over with.
Okay, Prowl. What to say about Prowl? He's a robot from outer space that transforms into a motorcycle. What else is there? I mean, sure, he has some skills. He's like some kinda ninja warrior jumping all around and hiding in the shadows. Yeah, he's pretty graceful - for a giant freakin' robot! Prowl has a code of honor, sorta like a samurai or somethin'. He spends a lot of time communing with nature. Something I wish I could do more of. Get away from all these darn robots.
Prowl's got these blades, a lot like throwin' stars, that he uses in a fight. He also has, whaddyacallem, holographic decoys of himself. But mostly he relies on his skill as a martial arts master. Once he had a sidecar that transformed into a suit of armor that enabled him to fly. Nearly tore up half of my city with those upgrades. This is why I hate machines! -Fanzone
JAZZ
What can I say about Jazz? For a bot as capable as he is, he's got priorities that are surprisingly miscalibrated. Oh, sure, he's a cyber-ninja, keeps his cool under fire and all that. But ever since we visited that mudball organic world he's become a grade-A glitchhead. All he wants to talk about is the culture of those organic humans! He loves their vehicles, their music, their sense of "style." The whole thing fragments my hard-drive every time I think about it.
Jazz is definitely an up-close-and-personal kinda bot. As a master of Circuit-Su who has studied Metalikatto, he's got some of the fastest servos on Cybertron. He also knows his way around his laser nunchaku. His vehicle mode is built for maneuverability and speed, though he seems more impressed with its aesthetics. Flaws aside, there are few bots I'd rather have at my back, even if my gears strip a little every time he opens his mouth. -Sentinel Prime
WRECK-GAR
Oh, this guy's a pain in the chassis. See, kids? This is what happens when you sit too close to the TV set. An AllSpark fragment found its way to a garbage dump and whamo ... Wreck-Gar. He caused quite a commotion. Thinks he's a comedian or something. Always pulling out props from his garbage container. He must have 27,000 gags piled up in there. The kid's like a cracked CPU; repeats anything you tell him. Seems to believe it, too. In the end he saved us all from some AllSpark infused nanomachines. Poor kid, sank to the bottom of the Detroit River. I suppose he wasn't so bad. -Ratchet
WASP
Wasp was an arrogant and talented cadet on the fast-track to joining the Elite Guard. He had the misfortune to attend Autobot boot camp at the same time as both myself and Bumblebee. When Bumblebee stumbled upon evidence of my status as a spy, he jumped to the erroneous conclusion that Wasp was a traitor. By planting evidence in Wasp's locker and allowing Bumblebee to find it, I removed Wasp from play while deflecting all suspicion from myself. Recently, I engineered Wasp's escape from prison as part of a campaign to sow discord among the Autobot ranks. He remains at large.
Wasp is forged from the same protoform mold as Bumblebee and, as such, has the same physical capabilities. However, his long incarceration has unbalanced him, leaving him mentally unstable. Unsurprisingly, Wasp has fixated upon Bumblebee as the cause of all his woes. It may be possible to leverage this for the Decepticon cause.
I must investigate further. -Shockwave
MEGATRON
Megatron is noble and wise, and rules the Decepticons with an iron fist. One cycle, not long from now, he will free the Cybertronians from the tyranny of the Autobots and force them to embrace the true way of the Decepticons. Join with me and shout Megatron's name to the heavens!
Megatron is all powerful and wields his twin tironium swords expertly. Moreover, his fusion cannon is powerful enough to blast through 15 mechanometers of solid steel. His armor can deflect even a sustained barrage of focused anti-protons. Though his body is mighty, his mind is mightier. Megatron is a brilliant military strategist who shows no mercy. He is also a genius in matters of science and engineering. In time, his destiny will be fulfilled and the glorious Megatron will be victorious over all who stand against him! -Lugnut
BLITZWING
Blitzwing is a good and loyal soldier in Megatron's army. I am proud to serve beside him. However, he is not the most mentally stable bot anymore. Long after the Great War ended, Blackarachnia rebuilt Blitzwing into a triple changer, able to assume two different vehicular configurations! This makes him a versatile comrade, able to function well both in the air and on the ground. Unfortunately, it also causes him to have three distinct personalities.
His icy persona is the most advantageous to Megatron. With this visage he is calculating and strategic. Also, this is the personality that represents his airborne mode, and all true Decepticons should take to the air! This form uses a hyperfrost emitter and missiles for offense.
His hothead persona is serviceably useful to Megatron's grand agenda. In this guise, he is angry and combative, useful traits for dealing with those miserable Autobots. This is the mindset he adopts for his tank configuration, armed with a superheater cannon.
His random personality, though, is infuriating! He can adopt it without warning at any time! When he does, he's as apt to break out in song as he is to further Megatron's glorious cause. -Lugnut
STARSCREAM
Fools! I am Starscream! ... Hold your applause! Kneel down and worship the TRUE leader of the Decepticons! ... assuming I can ever dispose of that accursed Megatron. Who does he think he is? Clearly, I am the superior leader. I've spend 4 million stellar cycles trying to destroy that overbearing bucket of spare parts. I've blown him up twice and yet he still functions!
I should point out to all my adoring fans out there that I am in fact the fastest of all Decepticons. With my dual sonic pulse blasters, I destroy all who stand in my way. But that's not all, folks. My strategic and cunning mind is unmatched. I am a natural built leader and am, without a doubt, the most dynamic, charismatic, and handsome bot this side of the Benzuli Expanse. I use an unmatched variety of tools to achieve my ends, including bombs, missiles and, oh yes, an army of clones. And, best of all, the AllSpark fragment embedded in my head ensures that I'll never go offline. That's right, the great Starscream is immortal. Soon the universe will tremble in my wake!
If you send a self-addressed stamped envelop to my agent Swindle, I would be more than happy to send you an autographed glossy 8" x 10". -Starscream
SARI SUMDAC
Sari is our human companion here on Earth. She teaches us about Earth customs and stuff. But she's also my friend. She's real peppy and enthusiastic, but she's always getting into trouble and leaking fluids from her optic sensors. Her adopted dad is Isaac Sumdac. You know, the scientist who owns Sumdac Systems. Oddly, she doesn't have any record of her existence. Weird. Humans should keep better records.
The AllSpark chose to make Sari the keeper of the Key. Which is really cool. It can repair bots and open doors and detect AllSpark fragments an' all sorts a stuff. Though, sometimes Sari can be a little irresponsible with it. Err, Soundwave, anyone? -Bulkhead
There's also this, which isn't a profile, but I thought it was interesting:
POWERS
It is written that in ancient times, billions of stellar cycles ago, there was peace. A race of automatons built, learned and explored, while a group of robots defended the others from any external threat. Then one horrible cycle, a terrible treachery! The military robots turned on the very mechanoids they were designed to defend. The betrayed automatons were slaughtered in droves, for they were ill equipped for warfare. In time, however, they adapted the tools and abilities that they had used for productive purposes into devices and powers able to ward off their deceptive adversaries.
Over the eons, these races clashed many times, evolving into the modern day Autobots and Decepticons. To this cycle, the Decepticons wield rays, projectiles, bombs, guns and explosive devices. We Autobots continue to eschew such barbaric instruments of destruction. Instead, we use our special powers to combat the Decepticon menace. -Prowl
THE NEMESIS
The Nemesis is the flagship of the Decepticon fleet. At close to three miles in length, it's the largest and mightiest Cybertronian war machine ever constructed. Its very name struck fear into the sparks of Autobots. That is, until Starscream got his greasy servos on it.
The main weapon system was four mammoth fusion cannons - gee, I wonder where Megatron got THAT idea? It also carried a full battery of moleculon missiles, laser cannons, heat beams, and proton projectiles. It was equipped to board other ships with magnetic tractor beams, and packed a Grand Mal class force field. An experimental Cybertroid-alloy star drive could propel it to distant corners of the galaxy in record times. I personally retrofitted the sensor array, giving it the most sophisticated energy detecting apparatus this side of the Eshems Nebula. It was truly a thing of beauty. That is, until it got splattered all over the lunar landscape.
After Starscream betrayed Megatron, it took him about five cycles to wreck the ship. He allowed it to get caught in the wake of an overloading space bridge, frying most of its circuitry. Good thing Swindle sold us those Devolan escape ships. I'd been smart enough to give the sensors extra shielding, and it looks like he used them to follow the AllSpark to Earth. When I realized what he was up to and tracked him down, he rejected my proposed alliance and blasted me into space. He should have been paying more attention to his piloting, because immediately afterwards he crashed the Nemesis into the Earth's moon. Just goes to show you what happens when you think with your thrusters instead of your processor. -Blackarachnia