I haven't read a lot of the Terran Underground series (a fault I will have to rectify, I see), so about Blashvor... is he a "good" Jil? The Jilectans all seem to be so "We're superior and the rest of you are all pond scum". Does Blashvor see humans as people? As people who could be partners?
And why do the Jils have these feelings of superiority? I believe in your fics you have established that they are stronger, taller, and more psychically gifted than humans - is that correct?
