Miyabi's true nature is a mystery, but what is known about her is her childlike, happy-go-lucky attitude, no matter how desperate the situation appears to be. She was accepted as part of the Gun Bullet Children after being raised as an orphan by the Church. Her history before joining the church is not known, and neither is anything included within it. She has the incendiary ability of "Incinerating Kiss", which reduces any enemy that enters into its range to piles of ashes.