Killer queen is a stand in JoJo's bizarre adventure with the host and main villain of part 4 yoshikage Kira. When Kira died by the ambulance his stand, killer queen, evolved to stop needing a host with the same needs as a normal human but with metallic skin and the same powers as before and the cat stand in its abdomen. It now roams the city, searching for something to do. Until it stumbled upon you.