I just want to point out, real quick, that the zakos in image 2(6.jpg) are NOT dead. They are from an image series were they are simply knocked out, including a main villainess, named Vixen(she has the more richly purple outfit and yellow boots)
https://www.deviantart.com/dangerfan/art/Warehouse-Job-6-452271667
Not sure about the others, most in the first set seem dead(maybe the bumblebee delmos?), and potentially a few in the second set. But the only one I know for sure are alive is the janitor one.
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Now, regarding Zako bodies. I think it makes sense for one of two things to occur, depending on the scenario: (I am also assuming fatal, since ofc we wouldnt have corpses if this was my preferred Aika style zako fighting)
A- The hero crushes the base. In this case any dead zakos are probasbly left where they fell, just by virtue of no one being there to bury them. Or at least until officials secure the scene. While dumpsters are fun, if they are already dead it would be a lot of effort for not much reward on the hero's part. Time that could be better spent fighting more zakos.
B- The zakos are killed by the org still controls the territory. In this case, the zakos must bury them quickly. After all, exposed corpses might bring the attention of the authorities in.
Of course, this all assumes normal conditions. Let's look at some unique scenarios -
A: Zakos that "vanish" when they die. This can be seen in the Shermans(Shamans) from God Mazinger. Also anything where they self destruct, etc.
[And iirc, the non-Shaman troops dont always vanish, though admittedly making bodies just vanish was common back then)
B: Revival or necromancy. If a faction can bring its soldiers back to life, collecting the bodies isn't just respect, cleanliness, or etc. It is logistics.
C: Recycling. This is mostly for robot style ones, but could also work for a frankenstein style zako. Or more generically, for a very cold faction it could mean stripping equipment and weapons.