- For the Part 4 Stand, See Killer Queen.
Killer Queen is a humanoid Stand of similar appearance to its alternate counterpart. Its crown is flat, while two sharp, triangular shapes resembling a cat's ears stand on either side of the top of its head. Its eyes comprise cat-like vertical pupils in front of generally light-colored sclera. It has no nose. With thin lips, its mouth is perpetually closed.
It wears dark, studded, leather-like forearm-length gloves, mirrored in style by a garter belt-like band at its waist and ankle-height footwear. Its thumbs are additionally bandaged in white.
Its shoulders, the back of its hands, belt buckle, both sides of its ankles and the top of its feet all bear the emblem of a skull with ears resembling its own; in varying sizes and external decoration. One minor yet constant difference between the designs of Killer Queen and its Part 4 counterpart is that, while Part 4 Killer Queen bears two skull emblems at its belt buckle, Part 8 Killer Queen bears only one.
Killer Queen shows no evidence of consciousness, its face often apathetic.
Explosive Bubbles: As described by Kyo Nijimura, Killer Queen's primary ability is to create bubbles that explode on contact. These bubbles typically float through the air as projectiles, but can also form inside a person's skin if Killer Queen physically strikes them.
Sheer Heart Attack: Killer Queen can produce multiple miniature tanks of varying sizes, some being small enough to travel through a person's bloodstream. Details on how they function are currently unknown, though Kira uses this ability to clear a blood clot from a young Josefumi Kujo, as well as detonate an entire pier, implying they can follow complex commands. The Sheer Heart Attacks shown do not have a nose like their counterpart and resemble it's beaten down form.