Yasuo Tanaka (referred to as Yamada in the 1979 anime) is one of Nobita&#039;s classmates and a background character. He is distinguishable by always wearing a baseball cap. He often appears with Haruo. He is often credited in the credits as Boy A (少年A).<br /> Yasuo has a younger sister, as seen in the 2005 anime episode The Horror of Gian&#039;s Pizza.<br /> <br /> (Source: Doraemon Wiki)<br /><br />