<Snipped quote by KoL>
Well the Boss is the Catalyst of all my badass female characters really.
Before her I was gonna suggest Ayaka kagari from witch craft works, as a witch for Eiko's foil, but I felt I should look for a different image.
I would suggest that she be from their world and not Eiko's, she could be a badass assassin that was hired to join them, who just happen to have cyborg arms and legs.
I'll face the risk of seem redundant, but I mus say that The Boss is really Da Boss. She's one of the most badass and believable written woman warriors that I've ever seen in any kind of media.
Anyway, I can work with that idea, she can an assassin working for the Mega Corp that built Eos prototype, assisting them in their plan to take control over all of the world's economy.