Ran Ryuuzaki

Reina's mother (Ran) is a very sweet, air-headed woman, who is very supportive of her daughter, and is very shy around her own husband. Though she possesses these traits, it is learned through a series of flashback chapters that she, like Reina, was also delinquent, known to some as "A Human Weapon." Reina has clearly inherited her violent tendencies from her mother, and her tender side from her father.

(Source: Wikipedia)