KB is aggressive to mostly anyone, but as he grew more emotionally attached to QT, this aggression slowly started to fade (however it would come back to anybody who would upset QT, however that may be). And after a certain event, he is only aggressive to other terrible people. KB is parasitic, thus needing a host to survive. KillerByte is not his true name, it is just a nickname given to him by some scientists. KB feels less pain than a normal human does. He feels approximately only 40% of pain.