Shizuka Hiratsuka, a Modern Japanese and homeroom teacher at Sōbu High School, oversees the Service Club with a blend of sharp insight and unorthodox methods. Her striking presence combines a tall frame with calf-length black hair, piercing purple eyes veiled by disheveled bangs, and a signature lab coat layered over a black vest, dress shirt, loosely knotted tie, and tailored slacks. Renowned for her compassionate yet no-nonsense approach, she champions student well-being, intervening in cases like Saki Kawasaki’s overwork and steering socially withdrawn pupils like Hachiman Hikigaya into the Service Club. Though open-minded, she bristles at references to her age or unmarried status, reacting with playful threats or visible irritation. Her youthful spirit shines through passions for shōnen manga, motorbike rides, and weaving manga references into conversations. Off-duty, she indulges in Seven Stars cigarettes, strong drinks, lazy naps, steaming ramen bowls, and Harlequin romance novels. A practitioner of martial arts with an "iron hold," she channels her physical prowess into mentoring, often orchestrating events like the Chiba Village summer camp or coercing Hachiman into club duties. Her guidance blends blunt truths with wisdom, urging students to align actions with words and avoid self-destructive habits. As Hachiman’s mentor, she relentlessly challenges his self-sacrificial tendencies, warning how his choices hurt both himself and those who care for him. Privately, she acknowledges his growth with quiet pride. Though her past remains shrouded, glimpses emerge through wry jokes about her single life and hypothetical romantic daydreams. Tasked with managing cultural festivals, sports events, and holiday projects due to her perceived vitality, she navigates school life in a red 2005 Aston Martin V8 Vantage, swapping it for rental vans during student trips. A campfire ghost story she shares hints at deeper layers, enriching group dynamics. Her philosophy echoes in mantras like urging others to "use all the words you need" and dissecting emotions beyond simplistic labels. Through sharp advice and unconventional tactics, she fosters introspection, pushing students toward authenticity while balancing her own contradictions—a guardian equally adept at dishing tough love and reveling in life’s gritty joys.