Torako

A friend of Asagi's who attends the same university. She smokes constantly and appears obsessed with being cool. Because of this, she sometimes gets annoyed with Yotsuba's antics, though she also admits to Koiwai she's not used to being around small children. Her name means "tiger" (虎, tora?) "girl" (子, ko?) and Yotsuba frequently calls her just Tora ("tiger"). [Source: Wikipedia]