P3G4SU5 wrote...
OP - What did you mean by, "Sovereign was mistaken for a Reaper spaceship several times until the truth was discovered."? Don't you mean Geth?
It depends on who you ask.
I'm not counting the Council's opinion, since they are so desperate to believe the Geth are responsible, they have convinced themselves of a complete and utter improbality: that a vessel so far beyond the technology of any galactic power could have been created by the Geth.
I'm actually going from the opinions of those who were closer to the truth and actually knew that Sovereign had something to do with the Reapers, even if they didn't know exactly what.
To quote the line Commander Shepherd delivers when meeting Sovereign:
"Sovereign isn't just some Reaper spaceship Saren found, it's an actual Reaper!"Which indicates that the team knew something nobody else did.
As for living metal, it is technically possible.
Metals have a similar molecular structure to viruses, so it wouldn't take much to create a "living metal" if you knew how.
Also, most of our blood is composed of an iron based molecule (haemoglobin), so if living metal wasn't possible, we'd be dying of oxygen starvation right now.
I'm assuming the Reapers somehow have the technology to fuse the organic characteristics of donor tissue and the technological aspect of the mechanical parts to create a living machine.
As for why the Reaper is not really shaped like a human if it managed to fully mature, I imagine Reapers have favored the "cuttlefish" shape and have specified this is the shape the mature Reaper will take, regardless of the donor DNA the source genetic material comes from.
As long as the Reaper possesses the DNA of the host species, it's still going have the characteristics the Reapers desired, even if it looks like every other Reaper.
Also, most beings have a common skeletal structure, ribs, skull, spine etc.
The Reapers probably have a process to integrate this "skeleton" into a Reaper shell, regardless of the different shapes the DNA fusion causes it to take (I'm imagining the DNA forms the Reaper material into an imitation of the living being it's being sourced from).
But this would result in certain Reapers having different shapes, depending on which species the DNA is sourced from.
Harbinger has a blunter nose and 4 yellow "eyes" on his "head", which sets him apart from the other Reapers.
I'm theorizing he is a Prothean Reaper, created much in the same manner as the Human Reaper, which could explain the differences in his appearance.
If this is true, he's the youngest Reaper, the first to be completed in relatively recent times.
I'm assuming most of the other Reapers are from older races that were culled in previous times.
Or possibly not at all, if the Reapers only create a new Reaper when they find a race worthy of converting into a Reaper.
With all the races the Reapers have destroyed, only the Keepers and the Protheans were worth keeping around as slaves?
Well, the Keepers are off that list now, the Reapers want to kill them because the Protheans broke their link to the Reapers.