In CORPSE-PARTY, his hair is black.
In CORPSE PARTY -Rebuilt-, he is seen wearing a white short-sleeved shirt, as well as a black one under it, along with dark green pants and brown shoes. His eyes are red with a slightly visible hue of dark pink and, as mentioned before, he has short black hair.
In Corpse Party, Yoshiki is a teenage boy of average build and height with gray eyes and short, bleached, somewhat-spiky hair. Yoshiki wears the standard dark gray male Kisaragi Academy uniform, his shirt opened, and underneath he wears the other white shirt (also present in the school dress code), partly opened, under which is a red shirt. Just like all the other students, he wears white shoes with blue soles.
In addition, he wears glasses in Corpse Party: Musume.
In Corpse Party: Missing Footage, he is seen wearing a simple black shirt, dark green pants and brown shoes.
Giving off the aura of a delinquent, Yoshiki faced difficulty in school due to issues at home. At one point, Yoshiki considered getting himself expelled from Kisaragi Academy, since he could not find a reason to continue attending if he didn't have an interest. However, Ayumi Shinozaki changed Yoshiki's mind on the matter after standing up for him against their P.E. teacher, Mikio Tsubota. Carrying over from his attitude at school, Yoshiki is prone to outbursts of frustration when faced with difficult situations. Though he often means well, his actions can appear cold or even selfish to those around him.
- Yoshiki is disowned by his parents, he lives alone and works a part time job. From time to time, his younger sister, Miki, checks in on him, being the only one who offers any sympathy.
- In the Corpse Party: Book of Shadows Character Contest, Yoshiki ranked 3rd place with 57 votes.