Prima
Planet of Origin: Cybertron
Place of Creation: Crystal City
Metal Color: White, light gray, light blue
Optic Color: Light Blue
Mouth Type: Standard (optional faceplate)
Alternate Mode: Unknown; Theorized cybertronian truck
Affiliation: The Thirteen Primes; Unknown tribe; the inhabitants of Elonia; the Children of Primus
Relatives; Primus (Creator/"Father"); Alpha Prime (Brother); Vector Prime (Brother); Solus Prime (Sister); Onyx Prime (Brother); Nonus Prime (Brother); Megatronus Prime (Brother); Quintus Prime (Brother); Nexus Prime (Brother); Micronus Prime (Brother); Alchemist Prime (Brother); Amalgamus Prime (Brother); Unknown thirteenth brother
Aliases: The First Prime; The Arisen; Warrior of Light; The Original Matrix Bearer; Primis Prime
Prima was the first Transformer to be created on Cybertron, being the eldest of his brothers and sister. He welcomed his siblings one by one and once they were all assembled, they were spoken to by Primus, their creator. They were given the mission of protecting and colonizing their planet and to do so, each of the Primes were given a special gift, with Prima being given the Matrix of Leadership.
After many years, the Primes had each made their own thirteen Cybertronian equivalents of countries, each being the home of one of the thirteen tribes. While it's unknown which of the countries belonged to who, especially due to how different the Cybertronian landscape is and how long it has been since the days of the Thirteen Primes, it is believed that Prima and his tribe were the tribe who inhabited a country that held Iacon.
Eventually, the Primes decided to move their efforts elsewhere. Each Prime ventured into space to find a world they could colonize. Prima founded the world Elonia aboard his Titan, Emissary. Now, Prima was the leader of a country and an entire world, as were many of his siblings. However, when the Thirteen met once again, they were attacked from the inside. Megatronus, joined by Nonus, Quintus, and Onyx, rebelled against the Primes and offered any of his brothers and sister to join them.
This caused a split between the Primes, with Prima's loyalists going to war with Megatronus's rebels. Prima's group became known as the Children of Primus, while their opponents became the Minions of Unicron. This is what began the first Cybertronian Civil War and would continue among the stars and colony worlds. Eventually, the loyalists and rebels would meet to negotiate. After Prima had thought that the peace they wanted was gained, Megatronus murdered their sister, Solus, and blamed Prima for it.
After a long war, Megatronus and his rebels were eventually beaten, with the help of turncoats Onyx and Quintus. Nonus Prime was incarcerated, although he was able to somehow escape. And because of how powerful Megatronus was, the remaining Primes couldn't risk his escape. Prima had Alpha Prime, having studied Solus's schematics, separate Megatronus from his armor. Each of the Primes took a fragment of it and spread it across the thirteen colony worlds.
With their greatest enemy defeated and powerless, the Primes created a coffin that they merged him in. With that, Prima locked the coffin using the Star Saber, a powerful sword that Solus herself had crafted, and they sent their brother into space, never to be seen again.
After that, most of the Primes went their separate ways. Elonia, having been decimated by the war, was abandoned by Prima and he, along with any survivors, returned to Cybertron. There, he found that only two of his brothers remained, Vector Prime and Alpha Prime. Prima would live out the rest of his days watching over the planet and eventually passing on, leaving the Matrix to a member of Alpha Prime's former tribe, Primon.
One of Prima's last acts was to hide the Star Saber away. Putting it in a place that no one would even look. Not even Vector Prime or Alpha Prime know where it is. Prima, whether his story is true or not, will always be remembered for his legacy of being the first Prime.