Is Killer Queen a girl?

Could you please clarify, are you referring to the Killer Queen from the popular anime and manga series "JoJo's Bizarre Adventure"? If so, it's important to note that the Killer Queen is a tarot card ability possessed by several characters throughout the series, rather than a specific individual. However, if we are discussing the Killer Queen as it was initially depicted in the series, it was a power wielded by a male character, Enrico Pucci. So, to directly answer your question, the Killer Queen, as it was introduced in "JoJo's Bizarre Adventure," is not a girl, but rather a tarot card ability.