The Brazilian Slaughter
Arcane
I like Origins that change the way the game plays and certainly this is one of those origins I will stay away from.
Same.
So instead of a lame list of traits, you would be able to configure your species' details. Imagine making a bunch of rock-eating slithering monsters who can hear but see better than a hawk.
If those details has some gameplay effect they can be implemented as traits.
If they have no gameplay effect, it can be just flavor text and sprite.
The problem is that the traits system is too limited. Its why Civics were split into Civics and Origins, Civics was just not doing it anymore, too broad.
My idea was more of a "Full Species Customization".
The thing is that aparently minor characteristics can end up being very important if handled right.
Its funny, humans in sci-fi tend to be portrayed as the Mario or puny Earthlings. The one exception is often HFY fiction where humans are often portrayed as some badass species for some reason.
For example, did you know humans are a pursuit predator? If there are stats we have bonuses in, it would be Endurance and Intelligence. We're like, the Terminators of the Natural Kingdom. We can literally out-tire most species in a pursuit, they can out-run us but we can out-tire them. This is also significant because Pursuit Predation seems to lead to being a Social Species, and I guess you can see where I'm going with this.
In simple terms, rather than having a small set of general traits, you would have multiple sets of traits for certain broad characteristics. For example, is your species oviparous (lays eggs) or viviparous (infants grown within mother)? Does it breathe oxygen or something else? Things like that.
This would be more of a Stellaris 2 thing tbh. I suspect that Stellaris 2 would use CKIII's fancy 3D character system for species, but adapted for space aliens. Essentially, go Full Spore on customization.