Tetsuki Takaoka stands at 180cm, with sharp black hair and eyes, his height slightly surpassing Chika Kudo’s at the series’ outset and hinting at further growth. He wears glasses during study sessions and discreetly removes his ear piercings before principal meetings. His school uniforms shift with the seasons, often worn with shirts or polos casually unbuttoned at the top. Born to affluence as the son of a prominent hospital director, he shares a childhood-forged bond with Chika Kudo, defying their contrasting social reputations. Teachers and peers alike acknowledge his protective role in her life, a dynamic solidified through years of loyalty. Academically gifted, he tutors Chika and their friends Sane, Kota, and Mittsu—who initially doubted his ties to Chika but grew into their own connections through his mediation. Beyond intellect, Tetsuki showcases culinary skill by cooking for study groups and martial prowess when confronting delinquents who framed Chika for vandalism, coercing their confession to exonerate her. His responsibility extends to calmly managing emergencies, such as babysitting Mittsu’s siblings while tidying their home and organizing scattered toys. He avoids sweets in favor of savory dishes like curry and sushi, resists rigid holiday plans, and thrives on low-stakes competition, admitting he simply “hates to lose.” His rapport with Chika’s aunt, Isaki Kudo, includes lighthearted jabs at her reckless driving, underscoring their relaxed familiarity. His name, blending “philosophy” and “life” with “tall hill,” mirrors his reflective yet resilient demeanor. Though primarily a steadfast supporter of Chika and the koto club’s indirect ally, his layered identity weaves together academic brilliance, combat readiness, and quiet emotional dependability.