Kanna Andō shares Kyoutarou Ichikawa and Anna Yamada's third-year middle school classroom. She consistently wears a facemask in regular interactions; when unmasked, her hair often obscures her mouth. The specific reason for her mask usage remains undisclosed, though it may relate to health considerations like illness or allergies.

Kanna possesses a defining fixation on her peers' romantic relationships. She actively organizes events and celebrations for dating classmates, driven by a stated desire to spark Kyoutarou's interest in someone. Her approach frequently disregards privacy, causing discomfort among reserved individuals who prefer discretion. This manifests notably in her coordination of unsolicited flash mobs featuring congratulatory banners and confetti, which complicates matters for couples seeking privacy.

Following a public rejection incident resulting from a flash mob confession she facilitated, Kanna demonstrates limited understanding of the consequences. She appears genuinely puzzled by another character's displeasure toward her, indicating a potential lack of awareness regarding social boundaries.

Physically, she has medium-length purplish-brown hair typically styled in twin-tails secured by small black ribbons, and brown eyes. Within school activities, she participates in the cooking club alongside classmate Sekine Moeko.