Do the Harvesters have any kind(s) of organized social structure?
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sorry this one got kind of long so it needed it’s own post!
yes, there is, sort of. firstly, all of them as a whole are called Fossarii. Harvester is a class, of sorts.
there are the standard Fossarii, also known as Collectors, and those have three classes. none are more important than the other, and there’s no real order except for what task they perform in the collection.

Reapers must simultaneously sever the soul from the recently deceased body and create a rapport in which the Harvester can work with. They can also use these same abilities to…like, destroy? It’s kind of a spoiler-y thing to explain.

Harvesters are the ones who actually extract the soul from the body, helping the newly deceased move on and manifest physically in “the afterlife.” They can use this ability to move through obstacles.

Salvagers are actually an optional class, but they appear in groups fairly often. Sometimes the act of being Collected is a great strain on the newly deceased and they can be anywhere to hysterical to violent to…manifesting as something not quite human. It’s the Salvager’s job to placate them.
It’s been said that Reapers take care of the body, Harvesters take care of the mind, and Salavagers take of the soul.
Once the Collection is over and any problems have been solved, the team then takes the object of their Collection to…

The Ostiarii, a trio of former-Fossarii who now act as “judges” between the newly deceased and the afterlife. Besides that they are the Superiors, the ones who decide who teams with what, which team gets what assignment, etc. The realm they reside in exists outside of time so they can handle the amount of deaths each day.
There’s also a group of Fossorii who, while they still do Collections, exist part time as [REDACTED], but I don’t have a name for them yet.
The groups of Fossarii exist in “circles,” each with three Ostiarii: for example, Shin (pictured above) is the Ostiarius Harvester of New York City. Circles always have a bit of overlap but it’s a general rule that which ever circle detects the death and assigns a team first gets the Collection.
that’s all i have right now!