insecuriosity

Unicron and Primus have, as far as I am aware, been part of the Transformers canon since G, and in that time they have done very little.
That is to say, Unicron was busy eating people and doing generally evil stuff, while Primus was left as an ambiguous and interpretable figure who never interfered or was given a voice/role.

I kinda set them aside as ‘the weak mandatory unexplored Cybertron religion’, until a certain episode in TFP. The episode that revealed Earth to be Unicron; ‘One shall rise’.

To me, this explained so many things. The unexplainable amount of Cybertronian relics, the presence of energon, and perhaps most importantly the similarities between humans and Cybertronians.
It offered a vague hint as to why the humans look so similar to the Cybertronians, and why they have so much in common; at the root they are connected.

Then I got to thinking a little more about this. If I wanted this headcanon to work, it would have to make sense that humans sprouted from Unicron, even though humans are not inherently evil. And Cybertronians are not inherently good!
So I started to look at the other things that set Primus and Unicron apart from each other. Primus is inert, Unicron is active. Primus is order and peace, Unicron is chaos and war. Primus is robotic and Unicron is organic.

It brought to mind a cycle. Order, after all, is only good as long as it is balanced with Chaos. Too much order inhibits growth and keeps change from happening. The same happens with Chaos- if there are too many changes and too much rapid growth, nothing will be able to last more than a short moment before being replaced.

So, what if instead of Unicron being evil, and Primus being good, the two gods cycle back and forth between Chaos and Order?
We would be seeing the late stage of Primus’ transformation - his order and stillness forcing all the living creatures in and on him into death until nothing is left to take.

In contrary, Unicron is only gaining more and more life - his crust is teeming with countless lifeforms! Still organic, still fleeting and chaotic, but there is already a species creating robots and researching a way of continuing life beyond what their organic bodies are capable of.
Just like the Cybertronians did to Primus long ago, humanity will gut Unicron of everything he has to offer, eventually shifting towards order more than towards Chaos. Over millions of years everything is brought to a status quo, and brought under strict rules. Humans become more alike robots, as augmentation becomes more and more apparent.

Back on Primus, abandoned and empty, chaos has taken its toll on him. Heavy space storms are battering him, meteors are impacting him, solar flares boil his surface and dark patches of space freeze him to the core. In spite of that, a single celled organism manages to withstand all this, and it begins to evolve.
As conditions stabilise over millions of years, Primus’ surface is covered in organic creatures - dust and corpses and carbon slowly burying the old relics of the people that lived on him before.

It is not a perfect headcanon just yet, but I am very proud of it. I hope to get an idea where I can use this in a story, but since it cycles over such a long time I think it will have to stay as just a headcanon or background worldbuilding.