Mia Kawai, niece of Dr. Kishida, serves as a pilot for the giant robot ARIEL. A college student, she initially displays reluctance towards piloting duties, prioritizing her academic life and personal independence. Her participation often hinges on her uncle's financial incentives, like covering tuition or rent, highlighting the tension between her familial obligations and individual aspirations.

She exhibits a strong-willed and occasionally irritable demeanor, particularly when Dr. Kishida intrudes on her daily life. She rejects his attempts to contact her via a modified helmet visor during her commute, explicitly refusing further involvement with ARIEL. Though frustrated by her grandfather's manipulative tactics, she repeatedly capitulates when offered financial support.

Mia shares a close relationship with her cousins, Aya and Kazumi Kishida, frequently convening with them to voice mutual dissatisfaction over their grandfather's demands. During one meeting, she and Kazumi agree to assist Dr. Kishida following a monetary offer, contrasting with Aya's initial refusal. Mia also demonstrates concern for family during crises, emphasizing Dr. Kishida's peril to persuade Aya to rejoin the team during an alien attack.

In combat, Mia takes command within ARIEL, coordinating tactics and directing her cousins. She voices strategic concerns, like feeling overwhelmed when outnumbered by alien forces, relying on teamwork to optimize the robot. Her resolve hardens when SCEBAI's base is destroyed, channeling her anger into combat to protect her family. Yet, she expresses visible dismay upon learning the base was rebuilt, implying a desire to end her piloting duties.

Her background includes a connection to her late grandmother, Ayumi; a photograph of Ayumi in Dr. Kishida's wallet bears a resemblance to Mia. This subtly hints at deeper familial influence behind ARIEL's design, though Mia's direct reactions remain unelaborated.