Yoshikage Kira

Yoshikage Kira (吉良吉影) is a fictional character from the Japanese manga JoJo's Bizarre Adventure.

Story
Kira(which sounds similar to Killer in Japanese), the main antagonist of series 4 of JoJo's Bizarre Adventure, longs for a simple life, and doesn't wish to be bothered. Although he reveals many talents, this yearning shows in his dislike of coming in first, as the cast eventually realizes. He becomes quite bothered when someone disrupts his "simplicity", and goes to extreme lengths to get it back. He keeps a collection of his own fingernail clippings, and believes when they grow quickly he has trouble. Kira also has a bizarre fetish for the female hand, stemming from an erotic fascination with the hands of the Mona Lisa. Unfortunately, his desire has never extended to the rest of the female person. This results in his murdering women in order to acquire their (severed) hands as "girlfriends"--when one "girlfriend" begins to decay, he goes off in search of a replacement.

Originally, Kira murdered his victims by stabbing them so viciously they were left with horrific back wounds (their hideous nature is implied by the fact that the reader is never actually shown Reimi's wound). However, his Stand, Killer Queen, eventually awoke from his desire to leave no evidence behind of his killings--hence its ability to make its victims completely disintegrate. He now lets Killer Queen annihilate his victims (except for his "girlfriend"-hands), letting everyone else think that the victims have simply gone missing. Even if the number of missing attracts attention (as it eventually does), no one would have any reason to suspect that Kira was involved.

Stand
Killer Queen is a humanoid Stand with fox-skull emblems on its shoulders, waist, and knees, and a vaguely cat-like head. Also, the space behind its stomach is hollow, letting it contain small items or creatures there. Killer Queen's abilities mostly involve explosions. Its primary bombs are actually booby traps--it touches a cohesive object (doorknobs, coins, even living bodies) and charges it. When someone touches it, the energy will be conducted into it, creating an internal explosion. On occasion, he will charge an object not to conduct explosive energy, but simply to explode when he finds the time to be right. He also has a secondary bomb called Sheer Heart Attack, normally contained within Killer Queen's left hand. It is a completely autonomous bomb with unlimited range, looking like a tank-treaded ball with a fox-skull face. Its method is to seek out whatever the warmest thing in the vicinity is, then induce an explosion there. Also, Sheer Heart Attack is totally indestructible, having withstood countless blows from Jotaro's Star Platinum without a scratch.

Late in the story, his father Yoshihiro Kira's Arrow pierces a second time Kira's body and grants Killer Queen a tertiary bomb, called Another One Bites the Dust. This bomb is actually a distinct, miniaturized form of Killer Queen, which normally stays with someone who knows Kira's secrets. If someone tries to interrogate that person about Kira, the tertiary bomb will enter their field of vision, get into their eye that way, and induce an explosion. Until Kira finds out who the bomb killed, he lets a brief temporal loop occur to one hour or day earlier. Even if the victim doesn't ask questions this time around, Another One Bites the Dust will still kill them. Only if Kira is confident about who died will he let time flow normally. Still, if he has to protect himself right away (he can't maintain more than one potential bomb at a time), he will dispel the bomb. In all three cases, internal explosions can potentially completely disintegrate the victim.