Can't find anything about units in the easily extractable stuff. I don't know that much about unity but you might need a deeper de-compilation than this to find that sort of thing.

However, I did find a lot of pid_'s the other guy missed by just rawdogging a search of all the files
So, a lot of them definitely aren't even pilots. It's probably supposed to be "portrait ID" or whatever. Yomogi's mom is there, for example. I think these are just anyone who has mid-map dialogue at all, and probably not exhaustive.
https://rentry.co/qvuwc2sz