Killer much calmer than his captain, advising him to be polite when meeting with his fellow Supernovas, and was then able to prevent a fight between him and Scratchmen Apoo from escalating while reminding them of the purpose of their meeting. He also seems to be more reasonable than his captain, which is in contrast to his name, as he tried to reason things out rather than immediately trying to start a fight. Killer is very caring towards his allies. He’s mildly arrogant, level-headed & patient.