Mitsukuni Hyuga reigns as chairman of Hyuga Corporation, a Tokyo-based powerhouse specializing in artificial muscle fibers and advanced powered suits. As founder, he dedicated his life to cementing its economic dominance, relentlessly advancing technologies like the Marishi Machina—a revolutionary suit amplifying physical prowess via electronic interfaces. His leadership, marked by unyielding discipline, extended to raising his son Koutarou, whom he groomed meticulously from childhood to inherit the corporate mantle and spearhead the powered suits division.

Driven by ambition, Mitsukuni partnered with Dan Amo’s parents to engineer a motorbike suit capable of transcending human physical limits. The project collapsed when Dan’s father perished during testing and his mother slipped into an irreversible coma—catastrophes Mitsukuni shrouded in secrecy. Similarly, his alliance with Makina Mikage’s father ended in the latter’s unexplained disappearance during trials, irrevocably binding Makina’s quest for familial redemption to the initiative.

Years later, Mitsukuni disclosed to Dan that his mother survived in cryogenic stasis, proposing to reattempt the experiment to awaken her by stabilizing her baryon matrix. Framing this as a chance for Dan and Makina to reclaim their fractured legacies, his true aim anchored in securing Hyuga’s monopoly over the burgeoning powered suits market. The gamble forced both protagonists to reckon with the experiment’s history of catastrophic system failures.

His dealings with Koutarou exemplify a calculated approach to leadership, valuing corporate permanence over emotional ties. Though entangled in ethical breaches—including manipulating Dan through veiled threats regarding his mother’s survival—Mitsukuni fixated solely on perfecting the Marishi Machina as his life’s defining achievement. Consequences like Makina’s forced suit activation during a covert probe laid bare the human toll of his pursuits, yet he met such confrontations with clinical detachment, unwavering in his resolve.