"For in my spark, I know that this is not the end... but merely a new beginning. Simply put... another transformation"
"The center of the storm is always still, and it's easiest to find a solution from there."
―Optimus Prime in Transformers: Robots in Disguise.
Optimus Prime is the titular main protagonist and a true Autobot warrior and the official leader of the Autobots during the war on Cybertron. Optimus and his fellow Autobots make up their Team. Before the Great War, Optimus Prime was originally known as Orion Pax; a young data clerk who worked in Iacon, under the wing of Alpha Trion. Alpha Trion was a mentor to Orion Pax and believed in Orion to become the next Prime. Orion was chosen by the High Council and became "Optimus Prime," upon being entrusted with the Matrix of Leadership by Primus himself. Years of war against his old friend/rival, Megatron, have brought Optimus and his team to Earth. On Earth, Optimus fights with his team to survive and to end the brutal war, against their enemies, once and for all. Optimus and his team met new species on Earth and tried to. During their fight against the Decepticons on the planet, Optimus and the other Autobots were subject to many disadvantages, managing to pull through every time in their various missions in order to stop Megatron's exploitation of Earth's vast Energon resources.
Eventually, Optimus then used the Omega Lock to restore Cybertron where he and his team (With Ratchet) currently work to rebuild the planet. Optimus Prime made Bumblebee warrior before he went on a journey with Wheeljack to retrieve the AllSpark, the source of Cybertronian life only to return to a planet attacked by Unicron and his minions, though Optimus was able to defeat the chaos bringer once and for all by trapping him, the AllSpark and the Matrix within Prime's own spark, but sacrificed himself to restore Cybertron's life. Before leaving, Optimus told his team, that they have acted like true Primes even without the Matrix. He asked them to keep fighting the noblest of fights, which Bumblebee responded by telling Optimus that they will keep the peace in his name. Optimus smiles at them and flies into the core. Team Prime sadly watch their leader leave into the core. Optimus enters inside and opens the Matrix of Leadership. As he enters the core, light shines on him as he closed his eyes. Suddenly millions of Sparks fly from the core into the sky. One red spark shined out (which seemed to be Optimus' spark) among them. It was revealed in Transformers Robots In Disguise episode Pilot (Part 2) that Optimus Prime was able to maintain his physical form to help Bumblebee and his team in defeating Underbite. However, Optimus does not know if he is alive and states that the universe has a plan for him. Optimus was training with the other Primes in the Realm of the Primes, who were testing him in a preparation for a new mission on Earth. In one of these tests, Micronus Prime served as Optimus's mentor. In Battlegrounds, Part 1, Micronus and the other Primes felt Optimus was not ready to face the new evil that comes to Earth. However, Optimus managed to convince them and they used their powers to upgrade Optimus to battle the new threat. Optimus is now upgraded and made it to Earth where he fought Megatronus, who turned out to be the new evil. After helping Bumblebee's team in defeating Megatronus for the moment, Optimus remained on Bee's team and is treated as an equal than a leader, as Optimus desired.
So what, it's just me without a name?
Optimus Prime was created as the last of the Thirteen Primes, the first generation of Transformers, each created directly by Primus as a band of unique warriors to combat and defeat Unicron. Upon his creation, Optimus united the Thirteen by his greeting All are one. While all of the other members of the Thirteen each possessed unique abilities and artifacts, Optimus wielded no special powers or weapons. It was only through his vision and courage that allowed the Thirteen to finally defeat Unicron. Furthermore, the plan concocted by the Primes involved Optimus using his Spark, which was very similar to Primus' own, to render Unicron comatose, with the other Primes attacking the Chaos Bringer as a distraction. Optimus emerged mostly unharmed from the final conflict that split the Thirteen. However, upon activation of the Well of All Sparks, Optimus chose to enter it and be reborn as one of the lesser Transformers, in order to know them and their needs better. He did so, and was recreated as the simple Orion Pax.