Kodachi is the sister of Upperclassman Tatewaki Kuno. She attends St. Hebereke School for Girls (Hebereke means something like "dead drunk") where she is captain of the martial arts gymnastics team. Although she is capable of defeating most normal opponents fairly, she prefers to use dirty tricks. Her opponents frequently meet with unfortunate accidents and are forced to forfeit.
A match between St. Hebereke and Furinkan brought Kodachi into contact with Ranma in both of his forms; like her brother, she is seemingly incapable of understanding that the two are one and the same. With male Ranma it was love (or lust) at first sight for Kodachi. She paralyzed him with a sneak chemical attack, and would have had her way with him had not Akane Tendo interrupted. Female Ranma was Kodachi's opponent in the martial arts gymnastics match. Kodachi incorrectly assumed that this pig-tailed girl was in love with Ranma.
Personality: Kodachi is the type who knows what she wants and takes it, no matter what is required. She doesn't see anything wrong with drugging Ranma's food in order to get him to stay with her, for example. Many have called her insane, and her loud evil-sounding laugh certainly gives the impression that this is correct.
Appearance: Kodachi's hair is worn in a pony-tail, grouped to the side. When expecting a fight she wears a leotard, usually one with her trademark Black Rose design on it. Other times she might be wearing her school uniform, a traditional Japanese kimono, or just ordinary clothes. Her speech is usually formal and proper, even to people she doesn't really respect (brother Tatewaki being a good example).