there should be a story about how Viltrumites were trying to save data and infrastructure that collapsed horribly in the Scourge virus disaster.
It was essentially an Apocalypse. Viltrumites we see are post-Apocalyptic society. Viltrum post-Scourge is a post-Apocalyptic world.
(you can see incoherent ramblings in bad English below)
Also another thing. I feel like there is a reason why Unopans were able to create Allen (and why Viltrumites look exactly like humans and have the same races and are somehow adapted to space).
Imagine a story.
Child Nolan, befriending a Viltrumite Archivarius (archivist lol), a historian. He's an old guy (or gal😁). And Nolan is a boy, listening to stories, being shown old data storage. Hanging out. Sitting on the stairs, or on the ground, in emerals green grass, under the gentle sunlight. The archivist tells him some strange ideas. About how there was a completely different time before Emperor Argall. And how the archivist wished they didn't abolish some custom, some tradition. And other things.
Growing up, Nolan's friendship with this old viltrumite began to suffer. He heard the regime critique in those insolent stories, in those treacherous ideas, in those lies and fairytales.
He stopped seeing the old archivist after one particularly explosive fight, where Nolan yelled at him for trying belittle Viltrum, to diminish the greatness they spread. Viltrumites are superior, no one ever comes close to their level.
The Archivarius, for the first time, lost his cool. He said, "What do you even know about our history? About our origins? Nothing! Only the illusion! I know where Viltrum started. And it was in dirt and water, like everyone else, until someone came to bring us closer to the sun. They gave us everything. They made us."
Nolan, like every person meeting beliefs too contradictory to their whole perception of the world, was intimidated by potential knowledge, and enraged at himself for even listening to all this. The Archivarius was aiming to poison his mind with false history and rebellious sayings. He left and didn't visit anymore.
Then the Purge happened. The archivist fought. He survived by accident. Nolan knew nothing beyond this.
He only saw him once since then. "Burying" him and unbearably many of others on Viltrum's orbit.
But before the Scourge virus stopped there was panic and chaos. Before the bodies were all cold and left in the space, dwindling number of healthy viltrumites were trying to hold together the quickly destabilising environment, the systems, the ships, the data, the power, the nurseries, food and water, everything.
It was a desperate time, and it didn't end after the burial.
One of Nolan's less pressing tasks was the archive restoration. The Archivarius wrote Nolan's name down as The Keeper. He didn't know that. But it meant that now there was no one on the whole Viltrum who could do more than Nolan here. With The Archivarius and every other knowledge keeper on the planet gone, it was his duty to do whatever he could.
And it was his right to observe whatever was left from the secrets only the highest ranks once knew. Like Argall's council when it was still present, and the Emperor himself, when he was alive.
Nolan found out many secrets. He was numb to that, after everything that happened, with impossible grief bogging all the remaining Viltrumites down, but there was one that would feel earth-shattering if only Nolan would be able to care enough: Viltrumites' true origin.
Now I don't know who could experiment on a multiple human (and possible others) populations to create perfect soldiers and explorers, extremely durable and adaptive, able to fly and immune to deseases, but it's not unheard of for a Sci-Fi universe to have an ancient enlightened race that surpassed everyone, and who lived many many many years ago, and whose traces are still found everywhere. They needed Viltrumites for something. Maybe even for themselves — like experimenting on animals before applying it to themselves. Who knows.
The point is, Viltrumites are awfully close to humans. Except for the powers, the main differences are: eye colour (Thaedus and Conquest), lack of body hair, and... I think that's all? Everything else is very obviously artificial, and in childhood before power awakening viltrumites are humans! This is the reason I'm not really in the "make more weird hybrid things for Mark that don't make sense!" boat. Like it's fun to imagine but it doesn't feel like something that should be there in canon. Oliver weird hybrid things? I'm a firm believer! But Mark weird hybrid things? I don't really think there are many. His inner conflict in the story plays a much bigger role than anything physical that could be happening to him due to his "hybrid" nature.
But never mind. I'm a big fan of "from inside a body that used to be yours" by thislittlebagofdreams. It's a great and very sad story. Debbie too afraid to continue living like normal with a literal alien in her house. and poor Mark who lost not just his father but also kinda his mother too, after Chicago.
Imagine Nolan finding out all of this? And he's The Keeper? And so when the mission to find a suitable race launches, he suggests the planet that is marked in the archives as the planet of Viltrumites ancestors?
Does he tell everyone everything when he first finds out? Or is he supposed to be a secret keeper and only report about this to Thragg? Is any of this a reason why he alone was sent there? Because it was somewhat classified? Or was he sent on Earth? What if he chose it himself and just notified the others about the location?
So many possible questions.
But if it was supposed to be a secret, and was kept as one (maybe not from Thragg, but who knows. Nolan was special, lol, everyone called him The Great Nolan haha, maybe it wasn't just because he was extremely successful in eradicating all the remaining threats to Viltrum after the Scourge. Viltrumites don't just value strength. they followed Argall for his wisdom, they said it themselves when they rebelled against Thragg), it could be one of the reasons Nolan infiltrated instead of immediate conquering, the reason why he studied human history and society, and one of the reasons why he opened his eyes and saw past Viltrum propaganda and indoctrination. Obviously the main reason for betraying Viltrum was learning compassion, empathy, and love because of all the familiar faces (BILLIONS OF THEM. LIKE ON VILTRUM, ONCE) he fought for everyday to protect, alongside with many superpowered individuals who love solving problems with their fists and pretty often can fly and/or punch pretty hard. And the lesser reason were Mark and Debbie.
But still. This could be a part of it, too.
The Viltrumites origin I think of is very obvious to me, because it's a natural leap from "wow they are so close to us that jot only we are so alike but also we make hybrids that can have babies too! incredible! impossible! it's almost like this trope was done before already! oh wait..." like. my man. my guy. my gals. my people. it's done more than once friends, but I still see fans who complain about how close to humans viltrumite are and how it's not interesting or believable.
Also Allen and the Viltrumites (whose children are, again, BASICALLY JUST HUMANS) mean that someone somewhere (Unopans and others) could make a Viltrumite out of a human. Modify them. Wouldn't that be fun. If Viltrumites are Daxamites, then what would be the Earth humans after gaining all those cracked superpowers? Phaelosians? lol
Hey, do you even remember Daxamites???????? Daxam? My guy Sodam Yat? No? Urgh, kids these days......