Nabiki Tendou

The second daughter of Soun Tendo. The most important thing to her is money and shed do anything to achieve it including blackmailing her own family members. In some stories she plays an important role in trying to extort money or placing bets just for her own amusement. She has a sarcastic materialistic egoistic manipulative sadistic and completely amoral attitude that is a sharp contrast to her older sister. She can in fact be seen as the most intelligent character in both manga and anime.