Miss Tobaru teaches classical Japanese literature and serves as homeroom instructor for second-year students including Raido, Reina Aharen, Ishikawa, and Hanako Sato. Her stern appearance features narrow eyes, a seemingly fierce expression, long black hair, and gray eyes. She typically wears a charcoal gray sweater over a white dress shirt, glasses, a maroon skirt, brown shoes, and tights.

Professionally, she enforces classroom discipline with strict teaching methods while employing unique descriptive approaches drawn from ancient literature. Privately, she fixates intensely on the evolving relationship between Reina Aharen and Raido, interpreting their interactions through a shoujo-style romantic lens. This preoccupation triggers pronounced physical reactions—spontaneous nosebleeds or blood-coughing when overwhelmed by perceived emotional poignancy—sometimes forcing lesson pauses or causing fainting. To curb these episodes, she rehearses nightly visualizations of potential scenarios involving the pair.

Her speech blends archaic Japanese with contemporary or foreign terms, yielding expressions like "あはれオブザイヤー" (aware of the year) and "モストバリュアブルあはれ" (most valuable aware). She frequently uses "あはれ" (aware) to denote deeply moving emotional resonance, reflecting its classical meaning rather than the modern "pitiful" nuance. Similarly, her "をかし" (okashi) invokes Heian-era connotations of "interesting," "tasteful," or "adorable" over contemporary "funny."

She shares a close friendship with fellow teacher Ms. Miyahira, who calls her "Momo-chan." They regularly socialize outside school, though Miyahira voices concern over Tobaru's gluttony during meals. Beyond literature, she possesses extensive knowledge of Japanese history and traditional games, notably defeating Raido and classmates in hanetsuki. Her surname combines the kanji "桃" (peach) and "原" (field/plain), meaning "peach field."