Killer Queen

Killer Queen (キラークイーン 'Kirā Kuīn') is the Stand of Yoshikage Kira featured in Part 4: Diamond is Unbreakable.

It is split into two sub-stands, Sheer Heart Attack 

(シアーハートアタック Shiā Hāto Atakku) and Bites the Dust (キラー・クイーン バイツァ・ダスト Kirā Kuīn Baitsa Dasuto).

Appearance
Killer Queen is a visibly muscular humanoid Stand about as tall as Kira himself, light in color overall. In both the manga and anime, it is portrayed as light pink. In the All Star Battle video game, it is portrayed as white.

Sheer Heart Attack is atreaded automatic bomb detaches from Killer Queen's left hand, so any Stand abilities activated upon it are reflected onto Kira's left hand. Because Sheer Heart Attack is attached to Kira's left hand, the primary bomb can still be used when Sheer Heart Attack is active.

Bites the Dust takes on the same appearance as Killer Queen, albeit smaller.

Powers
Killer Queen may charge any object, inanimate or not, as a bomb simply by touching it.

Sheer Heart Attack is completely autonomous and has a great range, so Kira can safely engage Sheer Heart Attack and move a great distance away while it carries out its duties. It seeks out whatever the warmest object in the vicinity is, even changing targets the second a warmer object appears; upon reaching its target, it automatically induces an explosion with power and blast size equivalent to the heat of the target.[37] If Sheer Heart Attack's explosion was set off by a non-human source, it will continue to seek out targets until it explodes from a human. Like Killer Queen's first bomb, Sheer Heart Attack's explosions remove all physical evidence of the target.

Bites the Dust appears as a miniaturized form of Killer Queen that hides inside whoever it is planted in; it acts independently of Kira's will, manifesting only when the bomb is triggered. When planted in Hayato, it activates when Kira's identity is revealed audibly or through writing,[48] as well as when other Stand users see the miniature Killer Queen.[49] When this happens, a miniature Killer Queen enters the eye of the person and causes an explosion, killing them.[50] The bomb can detonate multiple people simultaneously.[51]