I’d like to suggest a feature that applies specifically to infantry ground forces.
Currently, infantry units don’t specify which species they are composed of. I think it would add depth if, in the Ground Unit Design tab, there were a dropdown menu allowing you to select the race of the troopers. By default, this would be your starting race.
After performing an autopsy on an alien species, that race would become available for selection when designing infantry units. Choosing a race would consume 1 population unit of that species from the colony where the training facility is located. While 1 population in Aurora is not a significant cost, this requirement would ensure that you actually have a population available to recruit from (i.e., it cannot be zero).
Reasoning
Both historically and in science fiction, empires have often recruited from distant populations. Examples include Gurkhas and sepoys in the Birtish Empire, Roman auxilia, or species like the Kroot in Warhammer 40k.
Proposed Mechanics
Each race could have randomly generated traits (buffs or debuffs) at the start of the game. These traits would only be revealed after conducting an autopsy and would apply exclusively to infantry units. Humans would remain unchanged as the baseline.
Some example traits (might not be feasible in actual code):
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Strong/Weak Exoskeleton → armor bonus/penalty
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Lightweight → reduced logistical weight
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Tunneler → entrenchment bonus
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Frail → armor penalty
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Remote Viewing → bombardment bonus
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Intimidating → unrest reduction
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Robotic → No morale loss
Gameplay Impact
This system would encourage players to seek out and utilize specific populations for different roles. You might discover a race that excels in multiple areas, or one that is highly specialized (e.g.,defensive infantry, police units, etc.). Some species might be simply terrible for infantry roles like a squishy, amoeba-looking species.
Overall, this would add both variety and a minor strategic challenge. A player might want to recruit from a specific population, but if that species is located in a distant system, they would need to either transport a portion of that population to a core world (e.g., Earth) or establish and use training facilities locally. To make the challenge not trivial I would probably also make it so the population is 100% integrated so you can’t recruit from a freshly conquered planet.