Mitsugu Tsukushino is a high school student distinguished by her vibrant blond hair cut with blunt bangs, twin tails, and wavy side strands, accentuated by blue tareme-style eyes. Her slender, pale physique carries conflicting measurements: one source notes an 89 cm bust (E-cup) with unspecified waist and hips, while another specifies 86 cm (F-cup), 53 cm waist, and 82 cm hips. She habitually engages in cosplay, showcasing outfits ranging from maid dresses and school uniforms to miniskirts, often accessorized with ribbon ties and thigh-high stockings.

Estranged from her affluent conglomerate family due to her parents’ neglect, Mitsugu’s solitary upbringing fostered a deep-seated superstition. She obsessively consults a Gakken fortune-telling magazine and accumulates mail-order talismans, convinced the protagonist is her predestined match. Her courtship blends bashful earnestness with strategic exploitation of her wealth.

Naive and emotionally erratic, Mitsugu exhibits airheaded tendencies alongside unwavering loyalty. Despite fixating romantically on the protagonist, she nonchalantly permits their involvement with others, sparking a rivalry with Nao—her best friend and classmate. Their bond fluctuates between affectionate collaboration and competitive tension, illustrated through physical teasing like mutual groping.

Media portrayals expand her role into cosplay-centric scenarios, such as masquerading as a maid to privately court the protagonist. Her narrative intertwines loneliness with a quest for belonging, marked by misguided yet heartfelt attempts to buy affection through opulence and occult rituals. While her backstory remains fixed, her relationships gradually shift, blending comedic misadventures with poignant glimpses into her vulnerable persistence.