She is a member of the Black Dragon Clan, along with fellow fighters Kabal and Cobra. Her main weapons are a pair of knives named "Dragon Teeth".
From her bio in "Deception":
"I was the first of Kabal's recruits. I had stolen away to the mountains of Afghanistan, selling weapons to terrorists -- disguised as a man. When they discovered my gender, I had to fight my way out of the cave. I suppose Kabal assumed that any woman who could do business with cutthroat extremists organizations and live to talk about it must be worthy of his new Black Dragon clan. When I alone emerged from the cave, Kabal stood before me with an offer to join him. The complacency of the original Black Dragon allowed their destruction.
Kabal claims that a new Black Dragon clan will rise from the ashes -- more ruthless, more calculated than before. We will not exist as a mere band of pirates. We will cause the downfall of civilization itself and live in a world of blessed anarchy."
In "Armageddon", in an unusual twist for a fighter in the tournament, Kira's fate is actually worse if she succeeds than if she loses. If she wins, Kira uses her knew power given to her by Blaze to resurrect the fallen Kobra, only to have him kill her right afterwards. If Kobra wins the tournament, however, he chooses Kira to be his queen. The woman is transformed into a goddess of death by the Elder Gods, which proves fatal to Kobra, who is then killed by her kiss.