Kotoko Aihara is the main protagonist in the anime series 'Itazura na Kiss'. She is a spirited and determined high school student who falls in love with Naoki Irie, a handsome and intelligent classmate. Despite her lack of academic prowess, Kotoko is persistent and optimistic, qualities that help her face various challenges in her pursuit of Naoki's affection. Her role in the series revolves around her romantic journey and personal growth, making her a relatable and endearing character for the audience.