Nishiki Yatsuho operates the family-owned Yatsuho Liquor Shop, inherited from her grandfather. She has short black hair usually tied in a ponytail, featuring bangs swept left and shoulder-length strands framing her face, complemented by blue eyes. Her typical outfit includes a white shirt, a red string-like belt, blue pants, and light black ballerina flats, often layered with a grayish-cyan robe during shop duties.

Lively and sociable, Nishiki enjoys drinking, bantering with friends, and sharing jokes. She approaches her liquor business responsibilities diligently but tends to lose focus during conversations. She maintains a close friendship with Ayaka Sunohara, assisting her in the shop.

Her given name "Nishiki" translates to "brocade," while her surname "Yatsuho" combines the characters for "eight" (八) and "grain" (穂).