Mimiko Jigoku, head disciplinarian at Avocado Academy, commands attention with her striking appearance: thick black pigtails arching upward like horns, sharp bangs framing burgundy eyes, and a purple headband accenting large, expressive ears. Once aspiring to idolhood, childhood ridicule from peers Kaori and Hitomi—who mocked her surname’s infernal meaning—crushed her dreams, fueling a stern persona honed through years of enforcing rules. Her acute hearing and watchful vigilance make her notorious for catching even whispered mischief.

A transformative makeover by Chiako softens her rigid demeanor, widening her gaze and easing her expression. Witnessing Laala and Yui’s heartfelt duet rekindles her buried passion, sparking a resolve to confront her past. She returns to Paparajuku, publicly embracing her revived idol ambitions, and earns newfound support from classmates. Collaborating with Aroma on a performance coord, Mimiko channels her sharp auditory talents into her idol persona, harmonizing disciplined precision with creative flair.

Her name encapsulates her essence: “Mimi” (耳) for ears, “ko” (子) a feminine suffix, and “Jigoku” (地獄) meaning “hell”—a nod to both her strict reputation and the idiom “jigoku mimi,” denoting one who overhears everything. Through reconciliation with her history, she evolves from a fearsome enforcer to an encouraging performer, proving discarded dreams can be reclaimed without sacrificing one’s core strengths.