[@AGenericUser] thanks for giving all that info haha. it's very helpful. I have a few questions of my own as well! 

--you say Kai (I like kai better than kal lol) was a Birthed unit, but he seems to be of a different breed than the other test subjects--is there a explanation for that? did Kal (the scientist) alter/start his own experiment? was the "adaptable unit" tech used in the project Birth? because the Birthed are human--well, half human, but they were born, after all! Kai comes off as more like a robot. If you'd rather go the "a.i robot" route, that's fine, just don't get the half robot confused with the full robot.

--in the village, is there a specialist who makes those "disks", or was Kai only given one upon birth, maybe one saved from the earlier adaption units? I don't know if we have anyone skilled enough to create those disks (as it seemed to be a very specific operation and the scientists working on it are dead/missing), maybe Trixie & Kiki can try to develop something, but idk how successful they'd be... 

--I don't mind the nanobot system, that's very similar to the birthed's general tech area; it's easy to see how that can work in combat (and now i'm thinking of fire emblem haha), but this is sci-fi... I don't know how effective swords and lances would be against robotic minions. unless they were augmented, which makes some sense, considering the technology.

also, nanobot hair! now we have two characters who like to change their hair color... the personality swap thing might end up being a little hard to handle; you've already got the class system, no need to overburden yourself.