My theories about Bayverse history.
He is the first Transformer of the Tyran Universe. Although he is known as the creator of the Transformers in other universes, he is less known for it in this universe.
After the fragmentation of Primus Spark, the small trait of the destructive rage nested itself in this universe. This universe had only just emerged and the severed splinter of Primus Spark traveled thousands of years through the universe until it met Unicron. There was a fight, as in every universe, but here Primus was banished and not Unicron. Unicron managed to banish his twin in a cube-like vessel, but before that he infected his twin with part of his dark spark. This part nested in the Spark of Primus until the time was right to get active again.
After Primus was banished, Unicron threw the cube into the infinite universe and then withdrew itself to recover. The cube tore through space and landed on an uninhabited planet that was being used as a junkyard. Due to the impact and the metal lying around, Primus was able to transform his prison anew, separating his consciousness and his spark from each other. This means that he separated a part of his powerful Spark, stored his consciousness in it and transferred this Spark fragment into a suitable body. Thus the Allspark was separate and Primus could act as an independent Lifeform. The first transformer was born. Over time, Primus was attacked by several different beings. Many were hostile and so he had to act. He needed other Transformers to protect himself.
Through the information gathered from other species, Primus learned that life is finite and so he too had to produce an offspring who would carry on his legacy. He lit his own spark and became pregnant. Before long Prima was born. Now there were two of them, but in contrast to Primus, who knew and could everything, Prima was too young, inexperienced and had to learn everything. He could make his son grow faster so that he had the physical maturity of an adult Transformers, but mentally Prima was still a child, although he was a quick learner. Only he knew his father / mother named Primus. He didn't know anything else. This is how Primus created Prima's siblings. The 12 remaining Primes. Each of them drew their energy directly from the Allspark and were born through it. They looked terrible and completely different from Primus and his son. An untrained eye could hardly tell the 12 other children of Primus apart. However, each of them had small subtleties in physique, gestures, facial expressions and also in the face.
In the course of time, Primus' body became more and more drawn from life and became weaker. He felt that he had to leave soon. So he asked his son to bring forth a descendant in which Primus could be reborn. Even though there were only 13 Transformers, Prima did as he was told. He knew that then he would see his father again. However, Prima wasn't the only one given a mission. Each of the Primes was given a task and a power that they could use. Primus spoke to them and told them that they would not always live in peace and that many changes would also bring many consequences. After Primus assigned his children their tasks, he dissolved in the glaring light and merged with the Allspark. Until one day he could be reborn.
Unicron was the evil twin of Primus and although he was always defeated, he was the winner in the Tyran universe. However, he only succeeded because Primus was weakened. It was separated from the other splinters and so the darkness in the Primus of the Tyran universe was slightly larger than the light, which makes it easier for Unicron, who always stood for darkness, to overwhelm him.
After infecting and banishing his brother, Unicron also withdrew. He, too, was just a sliver of the once powerful Unicron we knew. He too was weakened. So he withdrew, far away to a remote corner of the universe. There it combined with dust and gases and slowly a planetary shape formed itself. He used the metals and made his own metallic body out of them. No sooner did he achieve this than he fell asleep and was forgotten over time.
When Cybertron attacked him, part of Unicron was awakened and the latter sensed the presence of his severed dark Spark on him. The time was now ripe to do what he came here to do. The total annihilation of Primus, because now he could return to the fight stronger than ever.
Although organic forms of life had formed on him, it did not interest him. He felt them as parasites and nothing more!
He was the youngest son of Prima and has a great secret within him that he don’t know about himself. Primus once told his son Prima to produce an offspring so that Primus could be reborn, and this happened even after several millennia. Only Prima had not given birth to one offspring, but two. They were twins. Twin Sparks. Although everything was done to ensure that there was only one heir, there were now two. The eldest of the twins did not have a prime badge, but the youngest and they call the youngest of the both to the Prime. He was the rightful heir. Research also showed that Primus was being reborn, but something was wrong. The energy signature was that of Primus, but all the knowledge of the first Transformer was gone. Optimus' Spark had no access to the Allspark like Primus once had. So something must have gone wrong, either at conception or at birth.
Despite extensive investigation, the fault could never be found.
Centuries after the birth of Optimus and his twin brother, the Primes war broke out. Prima, who always cared for his sons lovingly, had to separate his children from each other. The eldest was taken to one of his relatives to live in safety, but Optimus was in dire danger. In order for the Fallen to rule as sole Prime, he had to wipe out all of his siblings and their descendants.
Prima hid his youngest son in a bunker below the Rust Sea and gave him the order to wait for him until he returned and the danger would be over. But Prima never came back. Although he carried the power of his siblings within himself and banished the Fallen, Prima died from the power of his siblings, which he could not carry within himself, and the power of the 13 Primes was lost. Optimus himself waited in the bunker until he was found by Sentinel Prime by chance.
Sentinel Prime knew the legend and knew that Prima's youngest son was the reincarnation of Primus, but Sentinel was like the Fallen. He wanted to be the only Prime and not share his power. He took Optimus because he saw in him a potential heir whom he could manipulate. Only millennia later it turned out that Sentinel had found further Prime descendant and he had to get rid of it, which didn't quite work. To this day Optimus has survived and always fought for life and light. Although he didn't even know who he was and where he came from.
According to a prophecy from Onyx Prime, it was said that Primus would only wake up again when the all splinters of the Allspark were reunited and the darkness threatened every world in the universe. But until then, Primus would be considered missing.
He is the older twin brother of Optimus and the son of Prima. He too has a secret. He is the reincarnation of Unicron. Unicron once infected his twin brother Primus with a splinter of his Spark. This was passed on from Primus to Prima and has now been reborn as Megatron. Whether or not the Decepticon knows it is impossible to say. However, this Transformer loves chaos and follows his need to usurp everything. In Megatron, too, this ancient power has not yet awakened, due to prophecy. The time is not yet ripe for it.
Unlike Optimus, Megatron already knows that the two are Twin Sparks. Only Optimus doesn't believe him and presents it as a lie. He believes it stems from Megatron's sick notion that the two twins and are forever linked. Megatron found out this little secret through Sentinel's secret database, where the old man wrote down everything about the Prime Dynasty.
While Optimus was locked alone in a bunker for thousands of years, Megatron grew up in a peaceful environment under the care of other Primes and later also under Sentinel Prime. He got everything he needed and yet his inner greed was never satisfied. He always wanted more and everything. However, he was only a Lord High Protector and not a Prime. He was the Prime Guardian and only there to protect and support his Prime - in this case Optimus.
