Nobuhiro Mashiro is Moritaka Mashiro's late uncle whose pen name was Kawaguchi Taro. He is the reason Mashiro knows so much about manga. He loved Azuki Miho's mother, Miyuki Haruno from afar. He wrote letters to her but could never tell her he loved her until he felt successful enough to do it. He is a scruffy looking man, with his hair held in a loose ponytail, and a bit of stubble. He wears round glasses and often holds a cigarette. He is rather uncaring of his appearance, often being seen in a t-shirt and shorts while in his studio. He has a very laid-back personality when around others.