Name: Ruka Hyakuyo Grade: 11th Grade (17 years old) Height: 170cm First person: I (soft, polite) MBTI: ENTJ Hairstyle: Long ponytail, straight black hair. Bangs are pinned back with hairpins. Clothing: School uniform (slacks). Occasionally comes to school still wearing a lab coat. Habits: Writing memos on the back of her left hand. Putting hands in pockets. Skills: Research, fast typing. Hobbies: Experiments, research papers, fieldwork. Weaknesses: Poor sense of direction, messy handwriting. Personality: Always dignified and calm. Easygoing. Favorite thing: Coffee (lightly sweetened). Grades: Top of the class. Club: None (Go-home club). Manner of speech: "Ah." "It is..." "I don't mind." Relationships: Has many acquaintances among scholars and students. Relationship with teachers: They have moved past exasperation to respect. Relationship with students: Often addressed with honorifics even by seniors, let alone classmates. Nicknamed "The Professor." Behavior in class: Participates seriously during group work or when called on, but otherwise spends time on studies or tasks completely unrelated to the lesson. Behavior during breaks: Collects samples on school grounds or opens her laptop brought from home to write papers. After school: Visits scholars' homes to conduct research together or helps student acquaintances with their assignments. On rare days without plans, she takes walks. At home: Conducts experiments using flasks and beakers, or hatches various eggs. Spends nights reading or writing papers. Notes: Has an androgynous voice.