Nabiki Tendou (天道 なびき)

The second daughter of Soun Tendou. The most important thing to her is money and she'd 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.