Millefeuille, a 17-year-old student from Marseillu, exudes a calm, nurturing presence, earning her the affectionate nickname "Mille-nee" as a trusted older sister figure at her academy. Her life revolves around the Cooking Research club, where she channels her passion for preparing meals and supporting peers, though her fondness for Marseillu pastries leads her to discreetly avoid bathroom scales. Behind her gentle demeanor lies a gifted dancer whose agility and precision command the stage, securing her role as the leading performer in her unit.

Mentored by Chloe of the legendary group Ray, she honed her dual arts as a witch and performer. She shares a close bond with unitmates Yue and Fiona, often crafting meals to uplift them—though her earnest care sometimes spirals into mishaps. Her appearance mirrors her delicate grace: long green hair braided with a blue ribbon, perpetually closed eyes, and a petite 156 cm frame that marks her as the unit’s smallest member. She adorns the academy uniform with polished simplicity, pairing white socks with black mary jane shoes.