- Main article: Killer Queen
Kira's Stand is Killer Queen, a humanoid, short-range Stand with the unique ability to cleanly and completely obliterate objects with targeted explosions. This ability takes three forms that Kira names Bomb #1, #2, and #3.
- Bomb#1 (Bomb transmutation): By touch, Killer Queen may charge any object with explosive energy that is transferred into the first person to touch it. The Stand can then detonate the energy with a gesture, creating explosions of variable size and power.
- Bomb#2 (Sheer Heart Attack): An autonomous entity that detaches from the Stand's left hand. It tracks and destroy targets by infrared homing.
- Bomb#3 (Bites the Dust): Developed with the touch of the Arrow, this ability is a booby trap that, when triggered, permits Kira to loop time, resetting for up to one hour in order to outmaneuver attempts to investigate him.
- Main article: Stray Cat
After developing Bomb #3, Kira keeps Stray Cat in Killer Queen's abdomen. With Killer Queen's Primary Bomb charging Stray Cat's condensed air bubbles, Kira may create invisible, speedy air bombs (空気弾 Kūki-dan) to use as projectiles. Although he cannot see these bombs, he is skilled in determining their trajectory using basic mathematical skills.
Despite the power of his Stand Killer Queen, Kira's passivity led to an overreliance on its powers to the detriment of actual mastery.
Up until his appearance, Kira has avoided fighting at all, leading to a laissez-faire approach to Stand battles. Although he did personally kill Shigekyo Yango and knows a great deal about the subtleties of Killer Queen, he then let Sheer Heart Attack take care of two Stand Users, leading to an unexpected defeat and almost leading to his capture. He then became overconfident in Bites the Dust's invincibility, again leaving ample opportunity for Hayato to seek a loophole. Kira's tendency to hide and avoid instead of confronting his foes has left him no time to show any imagination in using his Stand.
However thanks to his intellect and "lucky" meeting with Stray Cat, Kira could sublimate Killer Queen's power to create a deadly long range combination of Stand abilities.
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