Hazuki Yazakura assumes the role of an adopted older sister in the main household, balancing familial duty with a personality marked by unconventional quirks. Her career as a pop idol demands frequent touring across Japan, keeping her physically distant yet cementing her status as a cherished figure both at home and publicly.

A standout trait lies in her prodigious ability to consume vast amounts of food swiftly, honed through the fictional "Okadu" eating technique. This method follows a tiered structure where mastery dictates advancement. Hazuki claims the title of Obakyu—the style’s highest rank—and acts as a sub-instructor. Her prowess is showcased when she triumphed over Satsuki Gokajo, a rival renowned for physical strength, in a competitive eating showdown.

Her narrative design subtly references *Little Ghost Q-Taro*, evident in flashbacks through costume parallels tied to her Okadu training. Though her touring schedule often keeps her away, she upholds a supportive sibling dynamic with the household, marked by loyalty and playful exchanges.