Last Autobot

There are Decepticon legends of an "Ultimate Warrior" and tales of the "Soul of Cybertron". Others say These are merely corrupted myths based on the truth — The Last Autobot!

According to legend, The Last Autobot is a guardian that Primus prepared, against the day that he would no longer be able to guide his creations. A stoic being, the Last Autobot awaits his destiny.

Marvel The Transformers comics
Billions of years ago, before going into his sleep, Primus prepared a Transformer called the Last Autobot. He gave the Last Autobot a measure of his power and set him to wait for the 'chosen one'.

After Primus's death, Cybertron appeared to be tearing itself apart and the Transformers abandoned their home world. The only remaining Transformer was Optimus Prime, whose soul was in the body of Hi-Q.

Prime traveled, along with the Neo-Knights, into the depths of Cybertron where he discovered the Last Autobot. When the Last Autobot awakened, he was surprised to find the form that the chosen one had taken—two souls in one body, a human body. (It's a long story.)

The Last Autobot merged the two souls into one new Optimus Prime body. He revealed that Cybertron wasn't tearing itself apart, but merely reformatting after the death of Primus. The Last Autobot stabilized the process, allowing Cybertron to reform without damaging itself.

After this, the Last Autobot traveled with Prime and the Neo Knights to the planet Klo, where they attacked the Decepticons. The Autobots were being slaughtered by the Decepticons, and the Last Autobot assisted in the battle—not actively, but by resurrecting all the Autobots who had fallen.

Finally, the Autobots (and presumably the Last Autobot) returned to Cybertron, while the Decepticons exiled themselves to deep space.

Classics


The Last Autobot created Modus Prime and the Mini-Cons to cleanse Cybertron of Demons and Mutants before the Autobots returned.

Regeneration One
For the next 21 years, the Last Autobot helped shape and steward a new age of peaceful coexistence on a revitalized Cybertron. Watching over Iacon from on high, he remained an enigmatic but potent figure of authority. So naturally when the Decepticons started causing trouble again, they had to deal with him first—as Soundwave hacked into the orbital defense grid and used one of the anti-asteroid satellite cannons to target and destroy the Last Autobot.

Soundwave's assault on the Last Autobot was later recounted by the Anti-Matrix entity.

Fun Publications
Autonomous Maximus was a member of the Thirteen. Vector Prime described him as a "lonely sentinel". At some point, Autonomous Maximus renounced his name. According to Vector Prime, the now-nameless Cybertronian took up a solitary vigil, awaiting "the inevitable".

In some universal streams, he, along with the others of the Thirteen, visited ancient Greece and adopted the personae of gods using holomatter avatars. He assumed the form of Apollo, the healer.

As Nexus Prime brought together the Terminus Blade and the Star Saber, his fellow Thirteen including the Last Autobot were drawn to his actions. These multiversal singularities were splintered and scattered by the act, making them into repeating parallel, but variable, versions of themselves throughout the multiverse instead of the singular beings they were before.