The second daughter of Soun Tendou lives with her sisters Akane and Kasumi in the Tendou Dojo. This is not only her home, but also her base of operations, for Nabiki Tendou is the craftiest person in Tokyo. Her business deals are always double edged. Her wagers are can cost you an arm and a leg. Her advice is never, ever free.
Nabiki has found a gold mine in Ranma's curse, so she profits to no end. She hoses him down, and then sells him a kettle of warm water to change back. She keeps his secret, for a price. When she is given the chance, will sell photos of him and her sister, Akane, to her classmate, Tatewaki Kuno. Remember he "loves" Akane and girl-type Ranma.
Nabiki may seem fair, but she always bases her decisions on her own interests. If someone else happens to profit, she'll send them a bill. Her deals always have fine print, and her loans always have steep interest. She cheats people outrageously, and enjoys doing it. Make no mistake. This is not a woman you want to cross. Her schemes often leave everyone but herself in a world of hurt or embarrassment.