Kohina Hiruko

Kohina Hiruko is a 10-year-old girl, who, despite her petty physique, is extremely powerful. Kohina, like her father, gives off a cruel psyche and will annihilate those that stand in her way without any remorse. She also displays a revengeful persona against those that have previously corrupted her plans or saved someone she aimed to kill. When said events happen, she loses her cool and badmouths the ones she fights, calling them weak.

(Source: Black Bullet Wikia)