Miwa Tamashiro, born Miwa Uzuki, stands as a pivotal force in the story’s events. In her youth, she spearheaded the original Big Shooter as its pilot, the essential aircraft foundational to constructing the Jeeg robot. Her role proved critical in aiding Hiroshi Shiba, the first Jeeg pilot, by delivering components necessary for the robot’s assembly.

Fifty years later, Miwa reemerges as the grandmother of Tsubaki Tamashiro, who joins Kyo Misumi as co-pilot of the new Big Shooter. Now commanding the New Build Base, she orchestrates counteroperations against the revived Jama Kingdom threat, ensuring the next-generation Jeeg’s successful deployment through strategic oversight and resource coordination.

Defined by unwavering resolve and ironclad determination, Miwa’s expertise as a pilot and unshakable dedication to safeguarding her city cement her as the team’s cornerstone. She forges a steadfast alliance with Kenji Kusanagi, bolstering his efforts against adversaries. Gradually, her influence shifts from tactical support to shaping the conflict’s outcome, reflecting her adaptability and tenacity.

Visually, Miwa radiates grace and serenity, epitomizing the "Yamato Nadeshiko" ideal of traditional Japanese femininity. This aesthetic aligns with her dual roles as a Shinto priestess and captain of the Build Angels, underscoring her profound connection to Japan’s cultural and spiritual heritage.

Her arc traces a evolution from accomplished pilot to visionary leader, driven by enduring loyalty to allies and relentless courage in adversity.