Ikue Ogawa is a petite high school student standing 1.47 meters tall and weighing 38 kilograms. Her distinctly childlike physique and youthful appearance frequently cause others to mistake her for a much younger child, sometimes even leading to confusion that she might be Himeji's daughter due to their close association.

She embodies wide-eyed naivety and maintains a consistently innocent, childlike demeanor in both her mental outlook and actions, often appearing less mature than her peers. Ogawa possesses a strong fondness for candy and relies on daily naps to meet her notable sleep requirement. Her problem-solving displays inventive yet unconventional tendencies, such as giving Eriko a sleeping pill to combat video-watching fatigue or initiating games using spilled floor wax for sliding. This approach frequently echoes Mr. Bean's impractical or absurd nature.

As the daughter of a drugstore owner, Ogawa has contextual access to items like sleeping pills. She integrates into the main friend group primarily through her deep bond with Kyoko Himeji, whom she affectionately calls "Hime-chan." Their relationship shows profound trust, including moments like sleeping in each other's arms, highlighting significant emotional closeness, with Himeji often acting protectively towards Ogawa's vulnerability.

A notable incident highlighting Ogawa's naivety involves her narrow escape from a dangerous situation with a man in a hotel, underscoring her susceptibility stemming from her innocent worldview. Her portrayal remains consistent as a static, childlike figure within the group dynamic across all documented media.