Destruction was bored. And that was never good.
He and Organization--who had recently been calling herself Creation, but nobody minded--hadn't been around each other a lot. After all, things hadn't changed much for a while, not in a big way, anyway. And those changes were mostly done by the other kwamis, combining their power and influence to make strange, new things come about. Still, though, life Was, and had been for a while. His power only made the predators more aggressive, while Creation's seemed to make them more curious. So, for the most part, they left the animals alone.
Destruction liked when things were changing. Some things were destroyed, others were created, and so they worked together to make something new. But now, the system that existed was too delicate to disrupt too much. Too many predators, the prey animals would die off, and the predators would starve. Too many plants, the prey would grow in numbers too fast, and they would soon overeat the abundance, causing famine. Left alone, things seemed to balance, but they were always concerned about how much was too far.
Even when new kwamis were born, they worked to teach them what they could do, and the danger in destroying the balance.
But...maybe, the balance should be disrupted sometimes. After all, he figured, choosing a good spot, if they never did anything or made anything new, what was the point of them existing?
So, he let a little bit of his power out into the ground around him. Not enough to destroy a star, not even enough to destroy the moon. Just enough, he thought, to make things change, to the point that he and Creation could do something new.
Unfortunately, the power was more than he expected. An explosion of fire and sound rocked the planet, releasing dust and ash that covered the planet, cooling it to the point that most of the largest creatures died from the cold. Winters became longer, summers shorter, and it became what was known as an Ice Age. As a side effect, the surface of the planet cracked, and the pieces began drifting away from that spot, colliding, sliding, sinking, rising and causing mayhem on the surface.
And Creation was as close to furious as humans have words for.
Destruction shrank as Creation showed him what he had done, the creatures he had destroyed, and the work done by their children that had been forever lost.
Destruction then presented his point, that little had been changing, and the two had not made anything new for a while. Their children, he protested, had learned from their early experiments, and could now make more interesting and effective beings.
Creation agreed to consider his reasoning, while their children rebuilt the world. Their abilities, she reasoned, were too strong and unrefined to do much beyond disrupting the balance further.
Destruction decided to leave his efforts on a large island, separated from the rest of the world by vast oceans, and too warm in the winter months to form ice bridges that would let the creatures escape. Even still, he didn't go overboard, just making everything a bit more dangerous, a bit more aggressive, than it was before. Subjection's venom did help, but he improved it somewhat.
What was considered, debated, rejected, and thought of by Creation during the time of rebuilding is impossible to say. In the end, she was an abstract creature who assisted in creating a physical existence. Humanity might, in several thousand years, be able to understand the nature of her existence, but never what problems she ponderered.
In short, though, she agreed with Destruction, and proposed a way for things to keep changing, perhaps forever.
Together, the powers of Creation and Destruction could form any thing fathomable, and many things impossible for humans to comprehend. The things they made changed, but not very quickly, although their children accelerated the process. What if, she proposed, they created a form of life with some of all their powers? One meant, above all else, to change themselves and the world around them.
The kwamis discussed the concept: A being with equal ability for creation and destruction, with ability for protection, subjection, illusion, who would be able to both transmit abilities and qualities, as well as feel, detect, and even change emotion in themselves and others.
In the end, the kwamis agreed, and decided on a shape. A thousand different ones were considered, a thousand rejected, until they settled on one capable of enough precision and intelligence, that they would be able to use all the abilities they were given, while also being smart enough to change what Was.
And so, the being was made, and humanity was born. Humanity began immediately to create protections, as the elements were harsh, but in time manifested all the abilities bestowed on them. Creation, in the formation of clothing and homes. Destruction, in their mastery of fire. Protection, in the purpose of their structures, as well as weapons to defend and defeat those larger and stronger than they. Illusion, hiding their true intentions from even each other, in order to feel part of the whole. Subjection, allowing a single man to lead them, though each could survive alone. Transmission, in teaching those younger the skills they developed, and allowing the freedom to improve them. And Emotion, in sensing another's pain and seeking to help.
There was, however, a cost, which the kwamis knew beforehand. The kwamis would be bound to humanity and the planet they were on. They could not change beings as they did before, only influence their minds. As a result, some humans focused more on creation, others, destruction, and so on.
But then, a strange thing happened as the humans learned. They began to think of things in ways as never before. They thought of tomorrow and yesterday, as well as today. They began to make settlements far from each other, and the concept of travelling was created. And so on. Just had been done when animals began to walk the earth, the beings that could think began to think of concepts never before considered.
As such, new kwamis began to be created. The concept of yesterday and tomorrow was realized in Time, who had the ability to perceive all that was or would be. With their inherent curiosity, humans began to travel back and forth across great distances, giving birth to Voyage. Nature was formed from the human's perspective of the storm, wind, and sea being untamable, untouchable, eventually being equal to a personality itself.
Redemption came about from humanity occasional stumbles, and starting anew as if old failures were no more. Disruption came about from humanity's occasional influence in the works of others. Legion was born from the conflicts against larger creatures, the humans realizing that a number of small foes could overpower a large one.
Unfortunately, as the annals of humanity can attest, while humans were given the ability to create and destroy, it would seem slightly more of Destruction's power went into their birth than Creation's did, causing an inbalance in the two that became apparent over time.
When I began writing this starting from the Big Bang, I knew that I had to explain how Plagg/Destruction killed the dinosaurs. I don't think that it's unreasonable to believe that an accidentally very strong Cataclysm would have similar effects to an asteroid. I could have made him chuck an asteroid, but that wouldn't do much for the argument in Style Queen that Plagg shouldn't use his power unaided.As for the Third Generation kwamis listed, I didn't feel comfortable diverting from canon regarding the revealed abilities of Miraculous. Some of them are less obvious, so I'd like to point out that Nature is meant to be the Dragon, Redemption the Cobra (Second Chance seems more like an ability of redemption than anything else), Disruption the Monkey, and Legion the Mouse.