She is very proud of him and, for the most part, tends to ignore his flaws. Hiroko is very protective of her son and loves him more than anyone else in the world. Hiroko is a former delinquent, and when she is angry that former attitude comes out, with her using a speech pattern similar to her son's. In the Japanese version of the game, Hiroko nicknames people using the "-cchi" suffix.
She has the habit of giving nicknames to the people she is on friendly terms with, typically doubling up a syllable of their name, such as Koko for Komaru Naegi and Fufu for Toko Fukawa. Hiroko also appears to be rather childish at times, referring to her close friends in playful banter. She convinces men to act as her envoys and venture out to rescue survivors on her orders through her "woman's special charm". Cruelty and killing, especially senseless killing, makes her absolutely furious enough that unlike the other members, she doesn't blame any of the chaos and the killings on the children. Hiroko is a street smart, relaxed and open-minded lady with a ' you do your thing, and I'll do mine- live and let live' personality. Hiroko is often depicted as having a cigarette in the corner of her mouth that she sometimes uses to puff smoke. She also wears black ripped jeans held up by a salmon colored belt and sky blue sneakers. She wears a white bead necklace, a white tank top, and a blue stadium jacket with an unknown symbol on the right side. She has brown eyes, much like Hiro, and a beauty mark beneath her lips.
Hiroko is a fair-skinned woman with light pink hair that reaches her waist.