Iyona Kawai is a classmate of Honmaru Edojo at Nanno Elementary School. She possesses a kindhearted and gentle nature, earning widespread affection from her peers and excelling academically with top grades in her class. Her athletic abilities are strong; she participates in the school volleyball team and demonstrates proficiency across various sports.

She maintains a pure and caring disposition, particularly evident in her affectionate interactions with the magician Taruruto, whom she calls "Taru-chan." Her feelings toward Honmaru involve a complex dynamic; while she occasionally harbors secret affection for him, she also expresses frustration with his frequent scheming or misbehavior. This creates a subtle romantic tension involving Honmaru and other characters like Tsutomu Harako.

Beyond romantic elements, she often serves as a moral counterbalance to the chaotic events triggered by Taruruto's magic. Iyona functions as a voice of reason during conflicts among classmates, actively mediating disputes. Her characterization remains consistent across media, emphasizing her inherent kindness, academic and athletic competence, and supportive role within the group dynamic.