Torako (虎子 Torako), also known as Tora (虎 Tora), surname unknown, is a friend of Asagi's who seems to attend 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. Yotsuba on the other hand is fond of her because she thinks her to be cool. Torako is also sometimes considered cynical, for example by Asagi. She often seems rather indifferent, almost melancholic, and doesn't speak much. Her name means "tiger child," and Yotsuba frequently calls her just Tora ("tiger") or Tigey. She is the only member of the younger cast with a car and also owns a folding bicycle which Yotsuba thought was incredibly impressive, though Torako did not attempt to show it off and didn't think it was such a big deal. Torako is a photography enthusiast and is often seen wielding her camera, with which she is thought to be quite good. Because of her close relationship with Asagi and the fact that he had never met her (or even seen her on photo), Jumbo initially feared that Torako was Asagi's boyfriend, since her nickname "Tora" could just as well be a man's name. When Yotsuba drew her together with Asagi and showed the drawing to Jumbo, Torako also looked quite androgynous. Upon seeing Torako's photographs, Jumbo commented that he thought she was taking black and white photos in an attempt to seem more like an artist.
Asagi is Torako's best friend. Despite the differences in their personalities, they seem to get along well and often participate in activities together, or just hang out. Though Torako said once that she thought Asagi to be a terrible person, such as when Asagi surprised her by taking Ena, Yotsuba and Koiwai along to accompany them on their way to see the hot air balloons. Torako not knowing this beforehand caused some trouble and the guests were nearly forced to remain at home, since Torako's car was too small to fit all of them.
Upon their first meeting, Yotsuba was sceptical towards Torako because of her smoking. But when Torako told Yotsuba that she smoked because it was cool, Yotsuba changed her attitude completely and since then Torako has been more or less the perfect example of coolness in Yotsuba's eyes. At first, Torako thought Yotsuba to be strange, and probably still does so to a certain extent, but she has become better at handling her with time.