QT is a robo-disguised human. And KB is a parasitic killer robot attached to her back. QT and KB can communicate with each other non-verbally, but they can't read each other's minds nor can they feel each others pain. They both have pyrophobia. If QT and KB were torn apart, it would be very painful for QT. She would most likely pass out and almost die, but she can still live. Their relationship is like an overprotective older brother with a younger sister. (KB acts like a Tsundere character lol)