EatChildren
Currently polling second in Australia's federal election (first in the Gold Coast), this feral may one day be your Bogan King.
The terminator baby really doesn't make sense on any level. Physical resemblance to a human cannot be coincidental, yet serves no function since that's going to be the "core" of a ship. None of its "human traits" in terms of body plan could serve any purpose. Making something out of liquified humans doesn't make any sense because it would be no better than making it out of the raw elements that humans are composed of. The fact that some carbon once belonged to a human is utterly irrelevant and makes it no more suibtable as a building material, nor do any of the "essential properties of a species" get transferred. This is on par with eating the hearts of your victims and thinking it's going to add to their power to yours.
Mass Effect as a series is full of pulpy dumb science fiction and borderlines on outright fiction devoid of science. I simply took it as them utalising the genetic footprint in human DNA to take on a physical form because reasons. Reasons like how biotics are space wizards.
The idea that a species is being preserved through this process is quite bizarre. Are their brains being uploaded to a computer before being liquified? Are we expected ot believe that once dissolved, their mind is preserved in some other capacity? Or is it simply that this intangible "essense of species" magically influences the behaviour of the Reaper's main computer because it's physical body is constructed out of person-goop?
This was almost exclusively added or at least expanded on in Mass Effect 3, not Mass Effect 2, and I didn't like it. Nobody liked the "hurr we're preserving species!!!" excuse. Because it was dumber than the usual dumb. In Mass Effect 2 the implication was that this was their method of reproducing, not preserving, and that the consciousness of the goo-ified species was destroyed.
Furthermore, putting their "worthy species archives" in a combat chassis that gets risked every single cycle seems like a pretty good way to have your achive destroyed. I hope they make backups somehow because we know that Reapers get destroyed in cycles periodically - not just ours, but we've found multiple dead reaper carcases throughout our galaxy. And we know that smaller, weaker, easier to destroyer Reapers exist, whom would presumably be more likely to be blown up in any given cycle.
Again, Mass Effect 3.