Somewhat. They're a monster that sucks the blood out of a human for sustenance. Or at least, that's what the mythos around it says... or at least, I thought it said, until I became one.

[ Naoto notices that Ledo's response is a bit lacking-- something that he wonders has to do with his world view and of humanity as a whole. But it was enough for him to realize that he's never stopped to actually think about it. Not having family was a big tip off-- so all he could do is push him even more. ]

But why limit yourself to just that post of yours? Would you be on standby forever, once you reach the end and your Alliance has no use for you? Come on man, there are better things in life than that.